Low supply voltage
â–¶ How to fix
Check the power supply and connectors to DCU. Check if other systems have the same DTC, that would indicate a general problem in the vehicle.
What you'll see
Door functionality is limited or completely missing.
System reaction
No system-reaction text recorded.
Diagnostic depth
Detection
The ECU checks if supply voltage falls below the normal operating range and the DTC is set when: - The voltage on the VBAT supply is below 16 V. - The voltage on any of the output power supply rails is under 4 V below the VBAT voltage (even if VBAT is OK).
Possible cause
The power system in the vehicle supplies less than 16V. The reasons could be: - fuses for the DCU in the electric centre are blown - damaged cable harness - faulty or drained batteries - faulty battery charging system (generator etc.)