Control unit
â–¶ How to fix
Erase the fault code and test run the auxiliary heater. Check cable harnesses and connectors. If the fault code recurs, renew the control unit.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Detection
Incorrect or invalid data in the control unit.
Possible cause
Internal fault in the control unit.