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 |
|---|---|---|---|
| P0424 | Emissions | MIL On | Unlock |
| P0430 | Emissions | Check Engine Light On | Unlock |
| P0431 | Emissions | MIL On | Unlock |
| P0432 | Emissions | MIL On | Unlock |
| P0433 | Emissions | MIL On | Unlock |
| P0434 | Emissions | MIL On | Unlock |
| P0440 | Emissions | Fuel Smells / Check Engine Light Only | Unlock |
| P0441 | Emissions | Rough Idle after Fueling / MIL On | Unlock |
| P0442 | Emissions | Check Engine Light Only | Unlock |
| P0443 | Emissions | MIL On / Hard Idle Hunt | Unlock |
| P0444 | Emissions | MIL On | Unlock |
| P0445 | Emissions | EVAP Fuse Blows Instantly | Unlock |
| P0446 | Emissions | Hard to Fuel / Gas Pump Clicks Off | Unlock |
| P0447 | Emissions | MIL On Only | Unlock |
| P0448 | Emissions | MIL On Only | Unlock |
| P0449 | Emissions | MIL On Only | Unlock |
| P0450 | Emissions | MIL On Only | Unlock |
| P0451 | Emissions | MIL On Only | Unlock |
| P0452 | Emissions | MIL On Only | Unlock |
| P0453 | Emissions | MIL On Only | Unlock |
| P0454 | Emissions | Erratic Fuel Gauge / Periodic MIL On | Unlock |
| P0455 | Emissions | Check Engine Light / Gas Cap Loose Lamp | Unlock |
| P0456 | EVAP System | Loose Gas Cap Message / Check Engine Light | Unlock |
| P0460 | Fuel System | Fuel Gauge Stuck / Erratic Dash Feed | Unlock |
| P0461 | Fuel System | Fuel Gauge Sluggish / MIL On | Unlock |
| P0462 | Fuel System | Fuel Gauge Reads E (Empty) Always | Unlock |
| P0463 | Fuel System | Fuel Gauge Reads F (Full) Always | Unlock |
| P0464 | Fuel System | Fuel Gauge Needle Drops to Empty over Bumps | Unlock |
| P0465 | Emissions | MIL On Only | Unlock |
| P0466 | Emissions | MIL On | Unlock |
| P0467 | Emissions | MIL On | Unlock |
| P0468 | Emissions | MIL On | Unlock |
| P0469 | Emissions | Venting System Shudders Int. | Unlock |
| P0470 | Exhaust | Turbo Lag / High Boost Fuel Slump | Unlock |
| P0471 | Exhaust | Poor Diesel Power / Regen Failure | Unlock |
| P0472 | Exhaust | Black Smoke / Engine Derate Mode | Unlock |
| P0473 | Exhaust | Forced Active DPF Regenerations | Unlock |
| P0474 | Exhaust | Power Dropouts during High Load Pulls | Unlock |
| P0475 | Exhaust | Engine Power Cut / High Whining | Unlock |
| P0476 | Exhaust | Lazy Turbo Spool / High Exhaust Odor | Unlock |
| P0477 | Exhaust | Engine Stumbles / Exhaust Flow Rested | Unlock |
| P0478 | Exhaust | Severe Power Cutout / Intake Popping | Unlock |
| P0479 | Exhaust | Erratic Braking Action on Grade Desc. | Unlock |
| P0480 | Cooling | AC Blows Warm at Stops / Engine Hot | Unlock |
| P0481 | Cooling | Engine Hot under Heavy Load / AC Cuts Off | Unlock |
| P0482 | Cooling | Engine Creeps towards Hot Line | Unlock |
| P0483 | Cooling | Fan Blades Spin but Engine Overheats | Unlock |
| P0484 | Cooling | Cooling Fan Fuse Blows Instantly | Unlock |
| P0485 | Cooling | Fans Inoperative / Temp Redlight | Unlock |
| P0500 | Vehicle Speed | No Speedometer / Harsh Trans Shifts | Unlock |
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