Generac Error Codes List

Note this is a follow up on the post linked below where we installed an external battery charger on this Generac generator. The Battery Tender we installed has been working well for over 4 years using the same battery that failed twice using the factory charger!

Error Codes For Generac Generators
Generac Error Codes List Comsonics
Generac Error Codes List In Order
Generac Error Codes List In Order Form Pdf
Generac Generator Error Codes List

After seeing tons of search data for the forums and answering tons of questions both here and on the phone, this chart seems like a helpful idea! The following are some common e-Codes from the Generac Evolution controller that you may see if there is a problem. There is a short description next to each one explaining a possible problem and a solution. Controller Fault ALARM The controller has. Generac products are available through a nationwide network of dealers, retailers, and e-commerce providers. Home Backup Generator Maintenance Tips The experts at Generac have provided a few maintenance tips to keep your generator operating properly and at optimal efficiency.

https://fettricks.blogspot.com/2015/06/substitue-battery-charger-for-generac.html

The most recent issue with the generator was a failure to complete its weekly self test. Upon inspection the OVER SPEED error light was on. You could still run the generator in Manual mode and it sounded like it was running normally.
My research indicated that, in addition to a genuine over-speed condition, this error can be caused when the sensor board doesn't have power so the sensor reading is not present, causing an erroneous Over Speed error. So I started looking for reasons that the sensor board might not be getting power. Let the sleuthing begin!
Danger Will Robinson! You should have a qualified generator service technician diagnose any issues with your generator. The voltage levels in the generator and associated switch gear are lethal. Forgetting to disconnect the power or touching the wrong spot at the wrong time can and will kill you. It is too easy to forget that you closed a breaker a few minutes ago. Really, have a technician do the work on your generator.

Safety first, this meant putting the generator in OFF mode and turning off the power to the house. Even then I pretend that every circuit is still live and avoid touching any conductors. Belt AND suspenders type of caution is the only way to go when dealing with electronics that can kill you!

When everything was off, I open up the generator's electrical panel and the transfer switch panel to look for obvious issues like disconnected wires, loose wire terminals and blown fuses. I got luck and found a blown fuse in the top of the transfer switch. There had been thunderstorms in the area shortly before the generator failed it's first weekly test.

I ordered a pair of fuses, $7 each, and a $15 fuse puller/installer. The fuse were not cheap but I ordered two since there is at least a 50-50 chance that the fuse blew for a reason and the first replacement will blow again as soon as you power the unit back on. If that happens, then back to the diagnostics. I would start with again killing the power and checking the resistance between the fuse terminals and the chassis, looking for a frayed wire shorting against an edge somewhere.
Fuse on Amazon
Fuse Puller on Amazon

The fuses arrived quickly, thank you Amazon, and I repeated the process of turning the generator off and turning off power to the house. I then used the fuse puller to remove the old fuse and install the new one. To be honest, I also wore rubber gloves when working with the fuses. Never bet your life that a power circuit is actually off.

We reconnected the house power, set the exercise time and the generator ran fine. It has now been over a year since the fuse was replaced and the generator has not missed a weekly self-test. It has also automatically started several times during actual power outages. And we still have a spare fuse!

Preview

I am doing some early testing for a battery voltage monitoring system that I put together for this generator. Below is a graph showing the battery voltage during the generator's weekly exercise. Here you can see the battery voltage drop during starting, then the voltage begins to recover while the generator is running and then the battery is topped off by the Battery Tender before dropping back to the standby voltage. I can also configure the system to send me an email or SMS when the voltage drops below a specific voltage (generally this happens during starting so I am notified of start events). My goal is to be able to detect battery deterioration (and indicate that the battery needs to be replaced) before a failure to start occurs. It is also reassuring to see the battery charger topping off the battery following the weekly self test.

Welcome to our listing page for Generic Check Engine Light Codes. This is an all inclusive list intended to help you get not only a code definition, but also some information on what could cause these codes and what can be done to repair the related faults. Generic check engine light codes were set up so that there would be a more standardized system of defining trouble codes from all the vehicle manufacturers. Many of the code definitions may seem a bit strange, so don't be afraid to contact us with any questions regarding definitions.

We have also implemented a new area for posting some responses to our most common code questions, so be sure to visit these pages for some instant info on your check engine light code! These Generic OBDII Check Engine Light Codes are listed numerically and by classification for easy searching. We are adding diagnostic help daily, so look for codes that link to a help screen and check back frequently! If you need more specific help, and are having trouble with a code that is not listed, you can also use the 'Get Help' link on the left hand navigation bar. Thanks, and please take a moment to read our Disclaimer before getting started!

I hope you find something useful from our site, and remember to refer a friend! Our goal is to provide you with the knowledge to know what is going on with your car when the check engine light comes on. This allows you not only to potentially diagnose a concern yourself, but also to make informed decisions when having your car serviced by a shop. With the potential costs associated with diagnosing and repairing generic check engine light codes, as well as manufacturer specific codes, knowledge is power! Thanks for stopping in, and for some great info on Oxygen Sensors, EGR Valves and Repair Costs, be sure to check out our Article Index!

DTC Codes - P0010-P0099 – Fuel and Air Metering and Auxiliary Emission Controls

P0010 'A' Camshaft Position Actuator Circuit (Bank 1)
P0011 'A' Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)
P0012 'A' Camshaft Position - Timing Over-Retarded (Bank 1)
P0013 'B' Camshaft Position - Actuator Circuit (Bank 1)
P0014 'B' Camshaft Position - Timing Over-Advanced or System Performance (Bank 1) - See Trouble Code P0011
P0015 'B' Camshaft Position -Timing Over-Retarded (Bank 1) - See Trouble Code P0012
P0020 'A' Camshaft Position Actuator Circuit (Bank 2)
P0021 'A' Camshaft Position - Timing Over-Advanced or System Performance (Bank 2)
P0022 'A' Camshaft Position - Timing Over-Retarded (Bank 2)
P0023 'B' Camshaft Position - Actuator Circuit (Bank 2) - See Trouble Code P0020
P0024 'B' Camshaft Position - Timing Over-Advanced or System Performance (Bank 2) - See Trouble Code P0021
P0025 'B' Camshaft Position - Timing Over-Retarded (Bank 2) - See Trouble Code P0022
P0030 HO2S Heater Control Circuit (Bank 1 Sensor 1)
P0031 HO2S Heater Control Circuit Low (Bank 1 Sensor 1)
P0032 HO2S Heater Control Circuit High (Bank 1 Sensor 1)
P0033 Turbo Charger Bypass Valve Control Circuit
P0034 Turbo Charger Bypass Valve Control Circuit Low
P0035 Turbo Charger Bypass Valve Control Circuit High
P0036 HO2S Heater Control Circuit (Bank 1 Sensor 2)
P0037 HO2S Heater Control Circuit Low (Bank 1 Sensor 2)
P0038 HO2S Heater Control Circuit High (Bank 1 Sensor 2)
P0040 Upstream Oxygen Sensors Swapped From Bank To Bank
P0041 Downstream Oxygen Sensors Swapped From Bank To Bank
P0042 HO2S Heater Control Circuit (Bank 1 Sensor 3)
P0043 HO2S Heater Control Circuit Low (Bank 1 Sensor 3)
P0044 HO2S Heater Control Circuit High (Bank 1 Sensor 3)
P0050 HO2S Heater Control Circuit (Bank 2 Sensor 1)
P0051 HO2S Heater Control Circuit Low (Bank 2 Sensor 1)
P0052 HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0053 HO2S Heater Resistance (Bank 1, Sensor 1)
P0054 HO2S Heater Resistance (Bank 1, Sensor 2)
P0055 HO2S Heater Resistance (Bank 1, Sensor 3)
P0056 HO2S Heater Control Circuit (Bank 2 Sensor 2)
P0057 HO2S Heater Control Circuit Low (Bank 2 Sensor 2)
P0058 HO2S Heater Control Circuit High (Bank 2 Sensor 2)
P0059 HO2S Heater Resistance (Bank 2, Sensor 1)
P0060 HO2S Heater Resistance (Bank 2, Sensor 2)
P0061 HO2S Heater Resistance (Bank 2, Sensor 3)
P0062 HO2S Heater Control Circuit (Bank 2 Sensor 3)
P0063 HO2S Heater Control Circuit Low (Bank 2 Sensor 3)
P0064 HO2S Heater Control Circuit High (Bank 2 Sensor 3)
P0065 Air Assisted Injector Control Range/Performance
P0066 Air Assisted Injector Control Circuit or Circuit Low
P0067 Air Assisted Injector Control Circuit High
P0070 Ambient Air Temperature Sensor Circuit
P0071 Ambient Air Temperature Sensor Range/Performance
P0072 Ambient Air Temperature Sensor Circuit Low Input
P0073 Ambient Air Temperature Sensor Circuit High Input
P0074 Ambient Air Temperature Sensor Circuit Intermittent
P0075 Intake Valve Control Solenoid Circuit (Bank 1)
P0076 Intake Valve Control Solenoid Circuit Low (Bank 1)
P0077 Intake Valve Control Solenoid Circuit High (Bank 1)
P0078 Exhaust Valve Control Solenoid Circuit (Bank 1)
P0079 Exhaust Valve Control Solenoid Circuit Low (Bank 1)
P0080 Exhaust Valve Control Solenoid Circuit High (Bank 1)
P0081 Intake valve Control Solenoid Circuit (Bank 2)
P0082 Intake Valve Control Solenoid Circuit Low (Bank 2)
P0083 Intake Valve Control Solenoid Circuit High (Bank 2)
P0084 Exhaust Valve Control Solenoid Circuit (Bank 2)
P0085 Exhaust Valve Control Solenoid Circuit Low (Bank 2)
P0086 Exhaust Valve Control Solenoid Circuit High (Bank 2)

DTC Codes - P0100-P0199 – Fuel and Air Metering

P0100 Mass or Volume Air Flow Circuit Malfunction

P0101 Mass or Volume Air Flow Circuit Range/Performance Problem

P0102 Mass or Volume Air Flow Circuit Low Input

P0103 Mass or Volume Air Flow Circuit High Input

P0104 Mass or Volume Air Flow Circuit Intermittent - see our 'articles' link for additional help with these generic check engine light codes

P0105 Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction

P0106 Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem

P0107 Manifold Absolute Pressure/Barometric Pressure Circuit Low Input

P0108 Manifold Absolute Pressure/Barometric Pressure Circuit High Input

P0109 Manifold Absolute Pressure/Barometric Pressure Circuit Intermittent - see our 'articles' link for additional help with these generic check engine light codes

P0109 Intake Air Temperature Circuit Malfunction

P0111 Intake Air Temperature Circuit Range/Performance Problem

P0112 Intake Air Temperature Circuit Low Input

P0113 Intake Air Temperature Circuit High Input

P0114 Intake Air Temperature Circuit Intermittent - see our 'articles' link for additional help with these generic check engine light codes

P0115 Engine Coolant Temperature Circuit Malfunction

P0116 Engine Coolant Temperature Circuit Range/Performance Problem

P0117 Engine Coolant Temperature Circuit Low Input

P0118 Engine Coolant Temperature Circuit High Input

P0119 Engine Coolant Temperature Circuit Intermittent - see our 'articles' link for additional help with these generic check engine light codes

P0120 Throttle Position Sensor/Switch A Circuit Malfunction

P0121 Throttle Position Sensor/Switch A Circuit Range/Performance Problem

P0122 Throttle Position Sensor/Switch A Circuit Low Input

P0123 Throttle Position Sensor/Switch A Circuit High Input

P0124 Throttle Position Sensor/Switch A Circuit Intermittent

P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control

P0126 Insufficient Coolant Temperature for Stable Operation

P0127 Intake Air Temperature Too High

P0128 Coolant Temperature Below Thermostat Regulating Temperature

P0129 Barometric Pressure Too Low

P0130 Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 1) - see our 'articles' link for additional help with these generic check engine light codes

P0131 Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 1) - see our 'articles' link for additional help with these generic check engine light codes

P0132 Oxygen Sensor Circuit High Voltage (Bank 1 Sensor 1) - see our 'articles' link for additional help with these generic check engine light codes

P0133 Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 1) - see our 'articles' link for additional help with these generic check engine light codes

P0134 Oxygen Sensor Circuit No Activity Detected (Bank 1 Sensor 1) - see our 'articles' link for additional help with these generic check engine light codes

P0135 Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 1) - see our 'articles' link for additional help with these generic check engine light codes

P0136 Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2) - see our 'articles' link for additional help with these generic check engine light codes

P0137 Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 2) - see our 'articles' link for additional help with these generic check engine light codes

P0138 Oxygen Sensor Circuit High Voltage (Bank 1 Sensor 2) - see our 'articles' link for additional help with these generic check engine light codes

P0139 Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 2) - see our 'articles' link for additional help with these generic check engine light codes

P0140 Oxygen Sensor Circuit No Activity Detected (Bank 1 Sensor 2) - see our 'articles' link for additional help with these generic check engine light codes

P0141 Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 2) - see our 'articles' link for additional help with these generic check engine light codes

P0142 Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 3) - see our 'articles' link for additional help with these generic check engine light codes

P0143 Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 3) - see our 'articles' link for additional help with these generic check engine light codes

P0144 Oxygen Sensor Circuit High Voltage (Bank 1 Sensor 3) - see our 'articles' link for additional help with these generic check engine light codes

P0145 Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 3) - see our 'articles' link for additional help with these generic check engine light codes

P0146 Oxygen Sensor Circuit No Activity Detected (Bank 1 Sensor 3) - see our 'articles' link for additional help with these generic check engine light codes

P0147 Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 3) - see our 'articles' link for additional help with these generic check engine light codes

P0150 Oxygen Sensor Circuit Malfunction (Bank 2 Sensor 1) - see our 'articles' link for additional help with these generic check engine light codes

P0151 Oxygen Sensor Circuit Low Voltage (Bank 2 Sensor 1) - see our 'articles' link for additional help with these generic check engine light codes

P0152 Oxygen Sensor Circuit High Voltage (Bank 2 Sensor 1) - see our 'articles' link for additional help with these generic check engine light codes

P0153 Oxygen Sensor Circuit Slow Response (Bank 2 Sensor 1) - see our 'articles' link for additional help with these generic check engine light codes

P0154 Oxygen Sensor Circuit No Activity Detected (Bank 2 Sensor 1) - see our 'articles' link for additional help with these generic check engine light codes

P0155 Oxygen Sensor Heater Circuit Malfunction (Bank 2 Sensor 1) - see our 'articles' link for additional help with these generic check engine light codes

P0156 Oxygen Sensor Circuit Malfunction (Bank 2 Sensor 2) - see our 'articles' link for additional help with these generic check engine light codes

P0157 Oxygen Sensor Circuit Low Voltage (Bank 2 Sensor 2) - see our 'articles' link for additional help with these generic check engine light codes

P0158 Oxygen Sensor Circuit High Voltage (Bank 2 Sensor 2) - see our 'articles' link for additional help with these generic check engine light codes

P0159 Oxygen Sensor Circuit Slow Response (Bank 2 Sensor 2) - see our 'articles' link for additional help with these generic check engine light codes

P0160 Oxygen Sensor Circuit No Activity Detected (Bank 2 Sensor 2) - see our 'articles' link for additional help with these generic check engine light codes

P0161 Oxygen Sensor Heater Circuit Malfunction (Bank 2 Sensor 2) - see our 'articles' link for additional help with these generic check engine light codes

P0162 Oxygen Sensor Circuit Malfunction (Bank 2 Sensor 3) - see our 'articles' link for additional help with these generic check engine light codes

P0163 Oxygen Sensor Circuit Low Voltage (Bank 2 Sensor 3) - see our 'articles' link for additional help with these generic check engine light codes

P0164 Oxygen Sensor Circuit High Voltage (Bank 2 Sensor 3) - see our 'articles' link for additional help with these generic check engine light codes

P0165 Oxygen Sensor Circuit Slow Response (Bank 2 Sensor 3) - see our 'articles' link for additional help with these generic check engine light codes

P0166 Oxygen Sensor Circuit No Activity Detected (Bank 2 Sensor 3) - see our 'articles' link for additional help with these generic check engine light codes

P0167 Oxygen Sensor Heater Circuit Malfunction (Bank 2 Sensor 3) - see our 'articles' link for additional help with these generic check engine light codes

P0170 Fuel Trim Malfunction (Bank 1) - Read Our Article On Oxygen Sensor Codes For Help With This Generic Check Engine Light Code
P0171 System too Lean (Bank 1) - Read Our Article On Oxygen Sensor Codes For Help With This Generic Check Engine Light Code
P0172 System too Rich (Bank 1) - Read Our Article On Oxygen Sensor Codes For Help With This Generic Check Engine Light Code
P0173 Fuel Trim Malfunction (Bank 2) - Read Our Article On Oxygen Sensor Codes For Help With This Generic Check Engine Light Code
P0174 System too Lean (Bank 2) - Read Our Article On Oxygen Sensor Codes For Help With This Generic Check Engine Light Code
P0175 System too Rich (Bank 2) - Read Our Article On Oxygen Sensor Codes For Help With This Generic Check Engine Light Code
P0176 Fuel Composition Sensor Circuit Malfunction
P0177 Fuel Composition Sensor Circuit Range/Performance

P0178 Fuel Composition Sensor Circuit Low Input

P0179 Fuel Composition Sensor Circuit High Input

P0180 Fuel Temperature Sensor A Circuit Malfunction

P0181 Fuel Temperature Sensor A Circuit Range/Performance

P0182 Fuel Temperature Sensor A Circuit Low Input

P0183 Fuel Temperature Sensor A Circuit High Input

P0184 Fuel Temperature Sensor A Circuit Intermittent

P0185 Fuel Temperature Sensor B Circuit Malfunction

P0186 Fuel Temperature Sensor B Circuit Range/Performance

P0187 Fuel Temperature Sensor B Circuit Low Input

P0188 Fuel Temperature Sensor B Circuit High Input

P0189 Fuel Temperature Sensor B Circuit Intermittent

P0190 Fuel Rail Pressure Sensor Circuit Malfunction

P0191 Fuel Rail Pressure Sensor Circuit Range/Performance

P0192 Fuel Rail Pressure Sensor Circuit Low Input

P0193 Fuel Rail Pressure Sensor Circuit High Input

P0194 Fuel Rail Pressure Sensor Circuit Intermittent

P0195 Engine Oil Temperature Sensor Malfunction

P0196 Engine Oil Temperature Sensor Range/Performance

P0197 Engine Oil Temperature Sensor Low

P0198 Engine Oil Temperature Sensor High

P0199 Engine Oil Temperature Sensor Intermittent

DTC Codes - P0200-P0299 – Fuel and Air Metering (Injector Circuit)

P0200 Injector Circuit Malfunction

P0201 Injector Circuit Malfunction - Cylinder 1

P0202 Injector Circuit Malfunction - Cylinder 2

P0203 Injector Circuit Malfunction - Cylinder 3

P0204 Injector Circuit Malfunction - Cylinder 4

P0205 Injector Circuit Malfunction - Cylinder 5

P0206 Injector Circuit Malfunction - Cylinder 6

P0207 Injector Circuit Malfunction - Cylinder 7

P0208 Injector Circuit Malfunction - Cylinder 8

P0209 Injector Circuit Malfunction - Cylinder 9

P0210 Injector Circuit Malfunction - Cylinder 10

P0211 Injector Circuit Malfunction - Cylinder 11

P0212 Injector Circuit Malfunction - Cylinder 12

P0213 Cold Start Injector 1 Malfunction

P0214 Cold Start Injector 2 Malfunction

P0215 Engine Shutoff Solenoid Malfunction

P0216 Injection Timing Control Circuit Malfunction

P0217 Engine Overtemp Condition

P0218 Transmission Over Temperature Condition

P0219 Engine Overspeed Condition

P0220 Throttle/Pedal Position Sensor/Switch B Circuit Malfunction

P0221 Throttle/Pedal Position Sensor/Switch B Circuit Range/Performance Problem

P0222 Throttle/Pedal Position Sensor/Switch B Circuit Low Input

P0223 Throttle/Pedal Position Sensor/Switch B Circuit High Input

P0224 Throttle/Pedal Position Sensor/Switch B Circuit Intermittent

P0225 Throttle/Pedal Position Sensor/Switch C Circuit Malfunction

P0226 Throttle/Pedal Position Sensor/Switch C Circuit Range/Performance Problem

P0227 Throttle/Pedal Position Sensor/Switch C Circuit Low Input

P0228 Throttle/Pedal Position Sensor/Switch C Circuit High Input

P0229 Throttle/Pedal Position Sensor/Switch C Circuit Intermittent

P0230 Fuel Pump Primary Circuit Malfunction

P0231 Fuel Pump Secondary Circuit Low

P0232 Fuel Pump Secondary Circuit High

P0233 Fuel Pump Secondary Circuit Intermittent

P0234 Engine Overboost Condition

P0235 Turbocharger Boost Sensor A Circuit Malfunction

P0236 Turbocharger Boost Sensor A Circuit Range/Performance

P0237 Turbocharger Boost Sensor A Circuit Low

P0238 Turbocharger Boost Sensor A Circuit High

P0239 Turbocharger Boost Sensor B Malfunction

P0240 Turbocharger Boost Sensor B Circuit Range/Performance

P0241 Turbocharger Boost Sensor B Circuit Low

P0242 Turbocharger Boost Sensor B Circuit High

P0243 Turbocharger Wastegate Solenoid A Malfunction

P0244 Turbocharger Wastegate Solenoid A Range/Performance

P0245 Turbocharger Wastegate Solenoid A Low

P0246 Turbocharger Wastegate Solenoid A High

P0247 Turbocharger Wastegate Solenoid B Malfunction

P0248 Turbocharger Wastegate Solenoid B Range/Performance

P0249 Turbocharger Wastegate Solenoid B Low

P0250 Turbocharger Wastegate Solenoid B High

P0251 Injection Pump Fuel Metering Control 'A' Malfunction (Cam/Rotor/Injector)

P0252 Injection Pump Fuel Metering Control 'A' Range/Performance (Cam/Rotor/Injector)

P0253 Injection Pump Fuel Metering Control 'A' Low (Cam/Rotor/Injector)

P0254 Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)

P0255 Injection Pump Fuel Metering Control 'A' Intermittent (Cam/Rotor/Injector)

P0256 Injection Pump Fuel Metering Control 'B' Malfunction (Cam/Rotor/Injector)

P0257 Injection Pump Fuel Metering Control 'B' Range/Performance (Cam/Rotor/Injector)

P0258 Injection Pump Fuel Metering Control 'B' Low (Cam/Rotor/Injector)

P0259 Injection Pump Fuel Metering Control 'B' High (Cam/Rotor/Injector)

P0260 Injection Pump Fuel Metering Control 'B' Intermittent (Cam/Rotor/Injector)

P0261 Cylinder 1 Injector Circuit Low

P0262 Cylinder 1 Injector Circuit High

P0263 Cylinder 1 Contribution/Balance Fault

P0264 Cylinder 2 Injector Circuit Low

P0265 Cylinder 2 Injector Circuit High

P0266 Cylinder 2 Contribution/Balance Fault

P0267 Cylinder 3 Injector Circuit Low

P0268 Cylinder 3 Injector Circuit High

P0269 Cylinder 3 Contribution/Balance Fault

P0270 Cylinder 4 Injector Circuit Low

P0271 Cylinder 4 Injector Circuit High

P0272 Cylinder 4 Contribution/Balance Fault

P0273 Cylinder 5 Injector Circuit Low

P0274 Cylinder 5 Injector Circuit High

P0275 Cylinder 5 Contribution/Balance Fault

P0276 Cylinder 6 Injector Circuit Low

P0277 Cylinder 6 Injector Circuit High

P0278 Cylinder 6 Contribution/Balance Fault

P0279 Cylinder 7 Injector Circuit Low

P0280 Cylinder 7 Injector Circuit High

P0281 Cylinder 7 Contribution/Balance Fault

P0282 Cylinder 8 Injector Circuit Low

P0283 Cylinder 8 Injector Circuit High

P0284 Cylinder 8 Contribution/Balance Fault

P0285 Cylinder 9 Injector Circuit Low

Error Codes For Generac Generators

P0286 Cylinder 9 Injector Circuit High

P0287 Cylinder 9 Contribution/Balance Fault

P0288 Cylinder 10 Injector Circuit Low

P0289 Cylinder 10 Injector Circuit High

P0290 Cylinder 10 Contribution/Balance Fault

P0291 Cylinder 11 Injector Circuit Low

P0292 Cylinder 11 Injector Circuit High

P0293 Cylinder 11 Contribution/Balance Fault

P0294 Cylinder 12 Injector Circuit Low

P0295 Cylinder 12 Injector Circuit High

P0296 Cylinder 12 Contribution/Balance Fault

DTC Codes - P0300-P0399 – Ignition System or Misfire

P0300 Random/Multiple Cylinder Misfire Detected

P0301 Cylinder 1 Misfire Detected

P0302 Cylinder 2 Misfire Detected

P0303 Cylinder 3 Misfire Detected

P0304 Cylinder 4 Misfire Detected

P0305 Cylinder 5 Misfire Detected

P0306 Cylinder 6 Misfire Detected

P0307 Cylinder 7 Misfire Detected

P0308 Cylinder 8 Misfire Detected

P0309 Cylinder 9 Misfire Detected

P0310 Cylinder 10 Misfire Detected

P0311 Cylinder 11 Misfire Detected

P0312 Cylinder 12 Misfire Detected

P0320 Ignition/Distributor Engine Speed Input Circuit Malfunction

P0321 Ignition/Distributor Engine Speed Input Circuit Range/Performance

P0322 Ignition/Distributor Engine Speed Input Circuit No Signal

P0323 Ignition/Distributor Engine Speed Input Circuit Intermittent

P0325 Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor)

P0326 Knock Sensor 1 Circuit Range/Performance (Bank 1 or Single Sensor)

P0327 Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)

P0328 Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)

P0329 Knock Sensor 1 Circuit Intermittent (Bank 1 or Single Sensor)

P0330 Knock Sensor 2 Circuit Malfunction (Bank 2)

P0331 Knock Sensor 2 Circuit Range/Performance (Bank 2)

P0332 Knock Sensor 2 Circuit Low Input (Bank 2)

P0333 Knock Sensor 2 Circuit High Input (Bank 2)

P0334 Knock Sensor 2 Circuit Intermittent (Bank 2)

P0335 Crankshaft Position Sensor A Circuit Malfunction

P0336 Crankshaft Position Sensor A Circuit Range/Performance

P0337 Crankshaft Position Sensor A Circuit Low Input

P0338 Crankshaft Position Sensor A Circuit High Input

P0339 Crankshaft Position Sensor A Circuit Intermittent

P0340 Camshaft Position Sensor Circuit Malfunction

P0341 Camshaft Position Sensor Circuit Range/Performance

P0342 Camshaft Position Sensor Circuit Low Input

P0343 Camshaft Position Sensor Circuit High Input

P0344 Camshaft Position Sensor Circuit Intermittent

P0350 Ignition Coil Primary/Secondary Circuit Malfunction

P0351 Ignition Coil A Primary/Secondary Circuit Malfunction

P0352 Ignition Coil B Primary/Secondary Circuit Malfunction

P0353 Ignition Coil C Primary/Secondary Circuit Malfunction

P0354 Ignition Coil D Primary/Secondary Circuit Malfunction

P0355 Ignition Coil E Primary/Secondary Circuit Malfunction

P0356 Ignition Coil F Primary/Secondary Circuit Malfunction

P0357 Ignition Coil G Primary/Secondary Circuit Malfunction

P0358 Ignition Coil H Primary/Secondary Circuit Malfunction

P0359 Ignition Coil I Primary/Secondary Circuit Malfunction

P0360 Ignition Coil J Primary/Secondary Circuit Malfunction

P0361 Ignition Coil K Primary/Secondary Circuit Malfunction

P0362 Ignition Coil L Primary/Secondary Circuit Malfunction

P0370 Timing Reference High Resolution Signal A Malfunction

P0371 Timing Reference High Resolution Signal A Too Many Pulses

P0372 Timing Reference High Resolution Signal A Too Few Pulses

P0373 Timing Reference High Resolution Signal A Intermittent/Erratic Pulses

P0374 Timing Reference High Resolution Signal A No Pulses

P0375 Timing Reference High Resolution Signal B Malfunction

P0376 Timing Reference High Resolution Signal B Too Many Pulses

P0377 Timing Reference High Resolution Signal B Too Few Pulses

P0378 Timing Reference High Resolution Signal B Intermittent/Erratic Pulses

P0379 Timing Reference High Resolution Signal B No Pulses

P0380 Glow Plug/Heater Circuit 'A' Malfunction

P0381 Glow Plug/Heater Indicator Circuit Malfunction

P0382 Exhaust Gas Recirculation Flow Malfunction

P0385 Crankshaft Position Sensor B Circuit Malfunction

P0386 Crankshaft Position Sensor B Circuit Range/Performance

P0387 Crankshaft Position Sensor B Circuit Low Input

P0388 Crankshaft Position Sensor B Circuit High Input

P0389 Crankshaft Position Sensor B Circuit Intermittent

DTC Codes - P0400-P0499 – Auxiliary Emissions Controls

P0400 Exhaust Gas Recirculation Flow Malfunction

P0401 Exhaust Gas Recirculation Insufficient Flow Detected

P0402 Exhaust Gas Recirculation Excessive Flow Detected

P0403 Exhaust Gas Recirculation Circuit Malfunction

P0404 Exhaust Gas Recirculation Circuit Range/Performance

P0405 Exhaust Gas Recirculation Sensor A Circuit Low

P0406 Exhaust Gas Recirculation Sensor A Circuit High

P0407 Exhaust Gas Recirculation Sensor B Circuit Low

P0408 Exhaust Gas Recirculation Sensor B Circuit High

P0410 Secondary Air Injection System Malfunction

P0411 Secondary Air Injection System Incorrect Flow Detected

P0412 Secondary Air Injection System Switching Valve A Circuit Malfunction

P0413 Secondary Air Injection System Switching Valve A Circuit Open

P0414 Secondary Air Injection System Switching Valve A Circuit Shorted

P0415 Secondary Air Injection System Switching Valve B Circuit Malfunction

P0416 Secondary Air Injection System Switching Valve B Circuit Open

P0417 Secondary Air Injection System Switching Valve B Circuit Shorted

P0418 Secondary Air Injection System Relay ‘A' Circuit Malfunction

P0419 Secondary Air Injection System Relay 'B' Circuit Malfunction

P0420 CatalystSystem Efficiency Below Threshold (Bank 1)

P0421 Warm Up Catalyst Efficiency Below Threshold (Bank 1)

P0422 Main Catalyst Efficiency Below Threshold (Bank 1)

P0423 Heated Catalyst Efficiency Below Threshold (Bank 1)

P0424 Heated Catalyst Temperature Below Threshold (Bank 1)

P0430 Catalyst System Efficiency Below Threshold (Bank 2)

P0431 Warm Up Catalyst Efficiency Below Threshold (Bank 2)

P0432 Main Catalyst Efficiency Below Threshold (Bank 2)

P0433 Heated Catalyst Efficiency Below Threshold (Bank 2)

P0434 Heated Catalyst Temperature Below Threshold (Bank 2)

P0440 Evaporative Emission Control System Malfunction

P0441 Evaporative Emission Control System Incorrect Purge Flow

P0442 Evaporative Emission Control System Leak Detected (small leak)

P0443 Evaporative Emission Control System Purge Control Valve Circuit

P0444 Evaporative Emission Control System Purge Control Valve Circuit

P0445 Evaporative Emission Control System Purge Control Valve Circuit Shorted

P0446 Evaporative Emission Control System Vent Control Circuit Malfunction

P0447 Evaporative Emission Control System Vent Control Circuit Open

P0448 Evaporative Emission Control System Vent Control Circuit Shorted

P0449 Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction

P0450 Evaporative Emission Control System Pressure Sensor Malfunction

P0451 Evaporative Emission Control System Pressure Sensor Range/Performance

P0452 Evaporative Emission Control System Pressure Sensor Low Input

P0453 Evaporative Emission Control System Pressure Sensor High Input

P0454 Evaporative Emission Control System Pressure Sensor Intermittent

P0455 Evaporative Emission Control System Leak Detected (gross leak)

P0460 Fuel Level Sensor Circuit Malfunction

P0461 Fuel Level Sensor Circuit Range/Performance

P0462 Fuel Level Sensor Circuit Low Input

P0463 Fuel Level Sensor Circuit High Input

P0464 Fuel Level Sensor Circuit Intermittent

P0465 Purge Flow Sensor Circuit Malfunction

P0466 Purge Flow Sensor Circuit Range/Performance

P0467 Purge Flow Sensor Circuit Low Input

P0468 Purge Flow Sensor Circuit High Input

P0469 Purge Flow Sensor Circuit Intermittent

P0470 Exhaust Pressure Sensor Malfunction

P0471 Exhaust Pressure Sensor Range/Performance

P0472 Exhaust Pressure Sensor Low

P0473 Exhaust Pressure Sensor High

P0474 Exhaust Pressure Sensor Intermittent

P0475 Exhaust Pressure Control Valve Malfunction

P0476 Exhaust Pressure Control Valve Range/Performance

P0477 Exhaust Pressure Control Valve Low

P0478 Exhaust Pressure Control Valve High

P0479 Exhaust Pressure Control Valve Intermittent

P0480 Cooling Fan 1 Control Circuit Malfunction

P0481 Cooling Fan 2 Control Circuit Malfunction

P0482 Cooling Fan 3 Control Circuit Malfunction

P0483 Cooling Fan Rationality Check Malfunction

P0484 Cooling Fan Circuit Over Current

P0485 Cooling Fan Power/Ground Circuit Malfunction

DTC Codes - P0500-P0599 – Vehicle Speed Controls and Idle Control System

P0500 Vehicle Speed Sensor Malfunction

P0501 Vehicle Speed Sensor Range/Performance

P0502 Vehicle Speed Sensor Low Input

P0503 Vehicle Speed Sensor Intermittent/Erratic/High

P0505 Idle Control System Malfunction

P0506 Idle Control System RPM Lower Than Expected

P0507 Idle Control System RPM Higher Than Expected

P0510 Closed Throttle Position Switch Malfunction

P0520 Engine Oil Pressure Sensor/Switch Circuit Malfunction

P0521 Engine Oil Pressure Sensor/Switch Circuit Range/Performance

P0522 Engine Oil Pressure Sensor/Switch Circuit Low Voltage

P0523 Engine Oil Pressure Sensor/Switch Circuit High Voltage

P0530 A/C Refrigerant Pressure Sensor Circuit Malfunction

P0531 A/C Refrigerant Pressure Sensor Circuit Range/Performance

P0532 A/C Refrigerant Pressure Sensor Circuit Low Input

P0533 A/C Refrigerant Pressure Sensor Circuit High Input

P0534 Air Conditioner Refrigerant Charge Loss

P0550 Power Steering Pressure Sensor Circuit Malfunction

P0551 Power Steering Pressure Sensor Circuit Range/Performance

P0552 Power Steering Pressure Sensor Circuit Low Input

P0553 Power Steering Pressure Sensor Circuit High Input

P0554 Power Steering Pressure Sensor Circuit Intermittent

P0560 System Voltage Malfunction

P0561 System Voltage Unstable

P0562 System Voltage Low

P0563 System Voltage High

P0565 Cruise Control On Signal Malfunction

P0566 Cruise Control Off Signal Malfunction

P0567 Cruise Control Resume Signal Malfunction

P0568 Cruise Control Set Signal Malfunction

P0569 Cruise Control Coast Signal Malfunction

P0570 Cruise Control Accel Signal Malfunction

P0571 Cruise Control/Brake Switch A Circuit Malfunction

P0572 Cruise Control/Brake Switch A Circuit Low

P0573 Cruise Control/Brake Switch A Circuit High

P0574 Cruise Control Related Malfunction

P0575 Cruise Control Related Malfunction

P0576 Cruise Control Related Malfunction

P0578 Cruise Control Related Malfunction

P0579 Cruise Control Related Malfunction

P0580 Cruise Control Related Malfunction

DTC Codes - P0600-P0699 – Computer Output Circuit

P0600 Serial Communication Link Malfunction

P0601 Internal Control Module Memory Check Sum Error

P0602 Control Module Programming Error

P0603 Internal Control Module Keep Alive Memory (KAM) Error

P0604 Internal Control Module Random Access Memory (RAM) Error

P0605 Internal Control Module Read Only Memory (ROM) Error

P0606 PCM Processor Fault

P0608 Control Module VSS Output 'A’ Malfunction

P0609 Control Module VSS Output 'B' Malfunction

P0620 Generator Control Circuit Malfunction

P0621 Generator Lamp 'L' Control Circuit Malfunction

P0622 Generator Field 'F' Control Circuit Malfunction

P0650 Malfunction Indicator Lamp (MIL) Control Circuit Malfunction

P0654 Engine RPM Output Circuit Malfunction

P0655 Engine Hot Lamp Output Control Circuit Malfunction

P0656 Fuel Level Output Circuit Malfunction

DTC Codes - P0700-P0899 – Transmission

P0700 Transmission Control System Malfunction

P0701 Transmission Control System Range/Performance

P0702 Transmission Control System Electrical

P0703 Torque Converter/Brake Switch B Circuit Malfunction

P0704 Clutch Switch Input Circuit Malfunction

P0705 Transmission Range Sensor Circuit malfunction (PRNDL Input)

P0706 Transmission Range Sensor Circuit Range/Performance

P0707 Transmission Range Sensor Circuit Low Input

P0708 Transmission Range Sensor Circuit High Input

P0709 Transmission Range Sensor Circuit Intermittent

P0710 Transmission Fluid Temperature Sensor Circuit Malfunction

P0711 Transmission Fluid Temperature Sensor Circuit Range/Performance

P0712 Transmission Fluid Temperature Sensor Circuit Low Input

P0713 Transmission Fluid Temperature Sensor Circuit High Input

P0714 Transmission Fluid Temperature Sensor Circuit Intermittent

P0715 Input/Turbine Speed Sensor Circuit Malfunction

P0716 Input/Turbine Speed Sensor Circuit Range/Performance

P0717 Input/Turbine Speed Sensor Circuit No Signal

P0718 Input/Turbine Speed Sensor Circuit Intermittent

P0719 Torque Converter/Brake Switch B Circuit Low

P0720 Output Speed Sensor Circuit Malfunction

P0721 Output Speed Sensor Range/Performance

P0722 Output Speed Sensor No Signal

P0723 Output Speed Sensor Intermittent

P0724 Torque Converter/Brake Switch B Circuit High

P0725 Engine Speed input Circuit Malfunction

P0726 Engine Speed Input Circuit Range/Performance

P0727 Engine Speed Input Circuit No Signal

P0728 Engine Speed Input Circuit Intermittent

P0730 Incorrect Gear Ratio

P0731 Gear 1 Incorrect ratio

P0732 Gear 2 Incorrect ratio

P0733 Gear 3 Incorrect ratio

P0734 Gear 4 Incorrect ratio

P0735 Gear 5 Incorrect ratio

P0736 Reverse incorrect gear ratio

P0740 Torque Converter Clutch Circuit Malfunction

P0741 Torque Converter Clutch Circuit Performance or Stuck Off

P0742 Torque Converter Clutch Circuit Stuck On

P0743 Torque Converter Clutch Circuit Electrical

P0744 Torque Converter Clutch Circuit Intermittent

P0745 Pressure Control Solenoid Malfunction

P0746 Pressure Control Solenoid Performance or Stuck Off

P0747 Pressure Control Solenoid Stuck On

P0748 Pressure Control Solenoid Electrical

P0749 Pressure Control Solenoid Intermittent

P0750 Shift Solenoid A Malfunction

P0751 Shift Solenoid A Performance or Stuck Off

P0752 Shift Solenoid A Stuck On

P0753 Shift Solenoid A Electrical

P0754 Shift Solenoid A Intermittent

P0755 Shift Solenoid B Malfunction

P0756 Shift Solenoid B Performance or Stuck Off

P0757 Shift Solenoid B Stuck On

P0758 Shift Solenoid B Electrical

P0759 Shift Solenoid B Intermittent

P0760 Shift Solenoid C Malfunction

Generac Error Codes List Comsonics

P0761 Shift Solenoid C Performance or Stuck Off

P0762 Shift Solenoid C Stuck On

P0763 Shift Solenoid C Electrical

P0764 Shift Solenoid C Intermittent

P0765 Shift Solenoid D Malfunction

P0766 Shift Solenoid D Performance or Stuck Off

P0767 Shift Solenoid D Stuck On

P0768 Shift Solenoid D Electrical

P0769 Shift Solenoid D Intermittent

P0770 Shift Solenoid E Malfunction

P0771 Shift Solenoid E Performance or Stuck Off

P0772 Shift Solenoid E Stuck On

P0773 Shift Solenoid E Electrical

P0774 Shift Solenoid E Intermittent

P0780 Shift Malfunction

P0781 1-2 Shift Malfunction

P0782 2-3 Shift Malfunction

Generac Error Codes List In Order

P0783 3-4 Shift Malfunction

P0784 4-5 Shift Malfunction

P0785 Shift/Timing Solenoid Malfunction

P0786 Shift/Timing Solenoid Range/Performance

P0787 Shift/Timing Solenoid Low

P0788 Shift/Timing Solenoid High

P0789 Shift/Timing Solenoid Intermittent

P0790 Normal/Performance Switch Circuit Malfunction

P0801 Reverse Inhibit Control Circuit Malfunction

Generac Error Codes List In Order Form Pdf

P0803 1-4 Upshift (Skip Shift) Solenoid Control Circuit Malfunction

Generac Generator Error Codes List

P0804 1-4 Upshift (Skip Shift) Lamp Control Circuit Malfunction
Please verify these Generic OBD II Code descriptions and testing procedures with an appropriate manual. We do frequently update this Generic Check Engine Light Codes list, but technology is constantly in motion. Due to the large amount of free content we provide, we cannot guarantee the accuracy of all information. We bend over backwards to make this information as correct as possible, but sometimes we can make mistakes. Don't tell anyone though!