Description

Overvoltage Uref

Effects on the driving operation

Driving operation restricted.

Frequency measurement and temperature measurement non-functional.

Possible causes

The voltage regulator for 12V constant voltage operates outside the allowed tolerance.

Place of action

Transmission control unit

Instruction

Replace transmission control unit.

Setting conditions of the event

Supply voltage > 16V,

Uref > 12.5V for at least 100ms.

Test conditions of the event

No description available.

Final function check

If the defective component cannot be clearly identified, you should try to reproduce the fault:

• Reinstall the component in the vehicle.
• Test the function.

After the fault has been eliminated, the following steps have to be carried out:

• Conduct a test drive with function check.
• Read out the fault memory.
• Check the transmission for leaks.
• Perform a final visual inspection.

These steps are necessary to ensure the entire vehicle functions.

See also:

		Aftersales service index