504 Generic diagnostic codes on file — with the full diagnosis, repair steps, and field insights open to read free, no signup required.
Disclaimer: General reference information for trained, qualified technicians only. Codes and procedures vary by model, serial number and software version. Always follow the manufacturer's service manual and your site's safety procedures. Use at your own risk. Not affiliated with or endorsed by any manufacturer.
| Code | System | Symptom | Full fix |
|---|---|---|---|
| P0291 | Fuel System | Misfire Cylinder 11 | View fix |
| P0292 | Fuel System | Cylinder 11 Fuel Stench from Tailpipe | View fix |
| P0293 | Fuel System | Engine Hunting under Constant Speed | View fix |
| P0294 | Fuel System | Misfire Cylinder 12 | View fix |
| P0295 | Fuel System | Cylinder 12 Heavy Pre-ignition | View fix |
| P0296 | Fuel System | Rough Running on Massive V12 Engines | View fix |
| P0300 | Ignition | Flashing MIL / Severe Engine Shake | View fix |
| P0300 | Engine | Rough Run / Flashing MIL | View fix |
| P0300 | Ignition | Flashing Check Engine Light / Engine Shake | View fix |
| P0301 | Ignition | Chugging Idle / Power Loss | View fix |
| P0302 | Ignition | Engine Shudder under Load | View fix |
| P0303 | Ignition | Engine Jerking on Acceleration | View fix |
| P0304 | Ignition | Rough Idle / Acceleration Hesitation | View fix |
| P0305 | Ignition | Misfire under Heavy Acceleration | View fix |
| P0306 | Ignition | Constant Shaking Shudder | View fix |
| P0307 | Ignition | Rough Idle / Spark Plug Odor | View fix |
| P0308 | Ignition | Dead Misfire / Heavy Shaking | View fix |
| P0309 | Ignition | Rough Idle on Multi-Cylinder Engine | View fix |
| P0311 | Ignition | Engine Misfires under Load | View fix |
| P0312 | Ignition | Rough Operation on Heavy Duty V12 Engines | View fix |
| P0320 | Ignition | Engine Stalls Suddenly / No Tachometer | View fix |
| P0321 | Ignition | Engine Cuts Out under Load / Surges | View fix |
| P0322 | Ignition | Engine Cranks but Will Not Start | View fix |
| P0323 | Ignition | Engine Spits, Sputters, and Dies Randomly | View fix |
| P0325 | Ignition | Engine Pings / Timid Acceleration | View fix |
| P0326 | Ignition | Spark Knock under Load / Power Sag | View fix |
| P0327 | Ignition | Engine Retards Timing / Lazy Acceleration | View fix |
| P0328 | Ignition | Severe Power Loss / Max Retard commanded | View fix |
| P0329 | Ignition | Intermittent Engine Ping / MIL On | View fix |
| P0330 | Ignition | Engine Pings on Hard Acceleration | View fix |
| P0331 | Ignition | Power Loss / Engine Rattles under Load | View fix |
| P0332 | Ignition | Engine Sluggish / Retarded Spark Curve | View fix |
| P0333 | Ignition | Severe Power Derate / Engine Labors | View fix |
| P0334 | Ignition | Intermittent Shudder / Random Engine Hesitation | View fix |
| P0335 | Ignition | Engine Cranks No Start / Cuts Out Dead | View fix |
| P0336 | Ignition | Hard Starting / Sputtering / Misfires | View fix |
| P0337 | Ignition | Crank No-Start / Backfires | View fix |
| P0338 | Ignition | Engine Shuts Down / Refuses to Crank | View fix |
| P0339 | Ignition | Sudden Engine Stalls over Bumps | View fix |
| P0340 | Ignition | Extended Crank / Hard Start / Limp Mode | View fix |
| P0341 | Ignition | Engine Stumbles / Backfires into Intake | View fix |
| P0342 | Ignition | Extended Crank / Hard Start | View fix |
| P0343 | Ignition | Engine Starts in Back-up Mode / Lazy Response | View fix |
| P0344 | Ignition | Engine Stumbles / Sudden Brief Cuts in Spark | View fix |
| P0350 | Ignition | Severe Misfire / Stalling / Rough Idle | View fix |
| P0351 | Ignition | Dead Misfire Cylinder 1 / Shake | View fix |
| P0352 | Ignition | Dead Misfire Cylinder 2 | View fix |
| P0353 | Ignition | Dead Misfire Cylinder 3 | View fix |
| P0354 | Ignition | Dead Misfire Cylinder 4 | View fix |
| P0355 | Ignition | Dead Misfire Cylinder 5 | View fix |
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