Cylinder 4 Fuel Heater Control Circuit Open
Per-cylinder fuel heaters (used on some heavy-duty diesels for cold-start atomisation) on cylinder 4 have an open control circuit.
Affected components
- Fuel heater cyl 4
Common causes
- High likelihood: Open in heater or wiring
- Low likelihood: Pin pushed back out of connector body
- Low likelihood: Cracked solder joint inside the module or sensor
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Related codes
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.