Fuel Supply Heater Performance
The fuel supply heater does not raise fuel temperature within the calibrated time window. Common in diesel and biofuel installations to prevent paraffin or fat crystallisation in cold weather.
Affected components
- Fuel supply heater
- Fuel temperature sensor
Common causes
- High likelihood: Heater element aged - low output
- Medium likelihood: Supply voltage low under load
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.