Audi A4 CVT gearbox problems will cause the PRNDS lights to flash and fault codes to be logged including: P1813 – pressure control valve 1 (N215) electrical malfunction, P1818 – pressure control valve 2 (N216) electrical malfunction, P0706 17090 – transmission range sensor (F125), P1757 18165 – supply voltage open circuit and P1793 18201 – transmission output speed sensor 2 (G196). The vehicle may be forced into fail-safe / limp home mode or simply refuse to select any gears: drive or reverse.
Excellent service and communication. The repaired unit is installed and working properly in a A4 cabrio 2007 model.
I had the PRNDS error flashing on my dash for a few months. After research on the net i discovered that this was a common problem with the ECU in the trans. I had the ecu removed and sent to ECU testing who were absolutely brilliant every step of the way, helping with how to pack & who to send with. They rebuilt the ecu & now the car is PERFECT! fast shipping & turnaround time. Extremely happy to help in any way & 1/6th the price of a new one!
It has been more then 2 months since I have received back my gearbox ecu from ecu-testing and everything is working perfectly. Also the mounting of the ecu did not require any further setup just plug and play. Overall excelent service both from an engineering and a customer care point of view. Already recommended to my friends who own cars with automatic transmissions.