Anyone who works with transmission control units on a daily basis will be familiar with the pattern: The Mercedes 9G-Tronic transmission control unit (VGS-NAG3, 725 series) It rarely fails without warning – gear-changing problems, jerking or a loss of power are the classic warning signs. Revonik repairs your control unit at circuit board level, within 2–4 working days and for up to 70 % less than a new part. No reprogramming is required after the repair – simply fit it in and carry on driving.
Typical fault patterns in the 9G-Tronic transmission control unit
Why Revonik?
Our technicians have been repairing Mercedes transmission control units for over 12 years – at component level, rather than simply replacing them. The original unit is retained and the vehicle-specific coding remains stored.
Our technicians have been repairing Mercedes transmission control units for over 12 years – at component level, rather than simply replacing them. The original unit is retained and the vehicle-specific coding remains stored.
Frequently Asked Questions
Will the coding remain intact after the repair?
Yes. We repair the original unit at component level. The vehicle-specific coding is retained in full – no reprogramming is required.
Yes. We repair the original unit at component level. The vehicle-specific coding is retained in full – no reprogramming is required.
What happens if the control unit cannot be repaired?
We will inform you of the diagnosis and, in this case, will only charge the standard diagnostic fee of €69.00 (including VAT). The device will be returned to you on request.
We will inform you of the diagnosis and, in this case, will only charge the standard diagnostic fee of €69.00 (including VAT). The device will be returned to you on request.
How long will the repair take?
Standard repairs take 2–4 working days from receipt of the device. An express option is available for standard faults (repair within 48 hours, plus €149.00 incl. VAT).
Standard repairs take 2–4 working days from receipt of the device. An express option is available for standard faults (repair within 48 hours, plus €149.00 incl. VAT).
