504 Generic diagnostic codes on file. Each shows the symptom for free — unlock the full diagnosis, repair steps, and field insights with a free account.
| Code | System | Symptom | Fix |
|---|---|---|---|
| P0291 | Fuel System | Misfire Cylinder 11 | Unlock |
| P0292 | Fuel System | Cylinder 11 Fuel Stench from Tailpipe | Unlock |
| P0293 | Fuel System | Engine Hunting under Constant Speed | Unlock |
| P0294 | Fuel System | Misfire Cylinder 12 | Unlock |
| P0295 | Fuel System | Cylinder 12 Heavy Pre-ignition | Unlock |
| P0296 | Fuel System | Rough Running on Massive V12 Engines | Unlock |
| P0300 | Ignition | Flashing MIL / Severe Engine Shake | Unlock |
| P0300 | Engine | Rough Run / Flashing MIL | Unlock |
| P0300 | Ignition | Flashing Check Engine Light / Engine Shake | Unlock |
| P0301 | Ignition | Chugging Idle / Power Loss | Unlock |
| P0302 | Ignition | Engine Shudder under Load | Unlock |
| P0303 | Ignition | Engine Jerking on Acceleration | Unlock |
| P0304 | Ignition | Rough Idle / Acceleration Hesitation | Unlock |
| P0305 | Ignition | Misfire under Heavy Acceleration | Unlock |
| P0306 | Ignition | Constant Shaking Shudder | Unlock |
| P0307 | Ignition | Rough Idle / Spark Plug Odor | Unlock |
| P0308 | Ignition | Dead Misfire / Heavy Shaking | Unlock |
| P0309 | Ignition | Rough Idle on Multi-Cylinder Engine | Unlock |
| P0311 | Ignition | Engine Misfires under Load | Unlock |
| P0312 | Ignition | Rough Operation on Heavy Duty V12 Engines | Unlock |
| P0320 | Ignition | Engine Stalls Suddenly / No Tachometer | Unlock |
| P0321 | Ignition | Engine Cuts Out under Load / Surges | Unlock |
| P0322 | Ignition | Engine Cranks but Will Not Start | Unlock |
| P0323 | Ignition | Engine Spits, Sputters, and Dies Randomly | Unlock |
| P0325 | Ignition | Engine Pings / Timid Acceleration | Unlock |
| P0326 | Ignition | Spark Knock under Load / Power Sag | Unlock |
| P0327 | Ignition | Engine Retards Timing / Lazy Acceleration | Unlock |
| P0328 | Ignition | Severe Power Loss / Max Retard commanded | Unlock |
| P0329 | Ignition | Intermittent Engine Ping / MIL On | Unlock |
| P0330 | Ignition | Engine Pings on Hard Acceleration | Unlock |
| P0331 | Ignition | Power Loss / Engine Rattles under Load | Unlock |
| P0332 | Ignition | Engine Sluggish / Retarded Spark Curve | Unlock |
| P0333 | Ignition | Severe Power Derate / Engine Labors | Unlock |
| P0334 | Ignition | Intermittent Shudder / Random Engine Hesitation | Unlock |
| P0335 | Ignition | Engine Cranks No Start / Cuts Out Dead | Unlock |
| P0336 | Ignition | Hard Starting / Sputtering / Misfires | Unlock |
| P0337 | Ignition | Crank No-Start / Backfires | Unlock |
| P0338 | Ignition | Engine Shuts Down / Refuses to Crank | Unlock |
| P0339 | Ignition | Sudden Engine Stalls over Bumps | Unlock |
| P0340 | Ignition | Extended Crank / Hard Start / Limp Mode | Unlock |
| P0341 | Ignition | Engine Stumbles / Backfires into Intake | Unlock |
| P0342 | Ignition | Extended Crank / Hard Start | Unlock |
| P0343 | Ignition | Engine Starts in Back-up Mode / Lazy Response | Unlock |
| P0344 | Ignition | Engine Stumbles / Sudden Brief Cuts in Spark | Unlock |
| P0350 | Ignition | Severe Misfire / Stalling / Rough Idle | Unlock |
| P0351 | Ignition | Dead Misfire Cylinder 1 / Shake | Unlock |
| P0352 | Ignition | Dead Misfire Cylinder 2 | Unlock |
| P0353 | Ignition | Dead Misfire Cylinder 3 | Unlock |
| P0354 | Ignition | Dead Misfire Cylinder 4 | Unlock |
| P0355 | Ignition | Dead Misfire Cylinder 5 | Unlock |
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