Fuel Supply Heater Control Circuit / Open
The controller cannot drive the diesel fuel filter or supply line heater. In cold weather diesel waxing can clog the filter.
Affected components
- Fuel supply heater
- Heater relay
- Wiring harness
Common causes
- High likelihood: Open heater element
- Medium likelihood: Failed heater relay
Diagnostic notes
- The malfunction indicator lamp may illuminate
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.