Search fault codes by symptom
Pick symptoms and a vehicle type to see published fault-code sheets that list those symptoms. A symptom is not a diagnosis.
How to use this page
Choose one or more symptoms, and optionally Auto, heavy truck, or diesel. The list shows published sheets that carry those validated symptom tags, most matches first.
A symptom is not a diagnosis. The same complaint can come from several codes. Open the sheet, then confirm the fault on the vehicle with a scan tool and the service manual.
Vehicle type
Symptoms
- Loss of power
- Check engine light
- Regen not completing
- Speed limited
- Hard start
- White smoke
- Black smoke
- Rough idle
- Stalling
- No start
- Overheating
- High fuel use
- Derate
- DEF warning
- DPF light
- ABS light
- Transmission warning
- Hard shift
- Air leak
- Low power on a grade
- High DEF use
- Limp mode
- Misfire
- Oil pressure warning
- Coolant warning
Matching sheets
Select at least one symptom to see sheets.