Transmission control unit 722.8, Mercedes A-Class W169

Gear-changing problems, emergency driving mode or the car won’t change gear at all? In many cases, the fault lies with the gearbox control unit – not the gearbox itself. Revonik will repair your Transmission control unit 722.8 Professional service, delivered in 2–4 working days, and up to 70% cheaper than buying new.

Common fault patterns

  • The gearbox won’t change gear or gets stuck in one gear
  • Emergency mode active – only one gear available
  • Unable to communicate with the diagnostic tester
  • Jerking or jolting when changing gear
  • Transmission oil warning light or transmission fault message on the display

Why Revonik?

Our technicians have been repairing control units for over 12 years – at circuit board level, not simply by replacing them. Your original unit is retained, the vehicle-specific coding is saved, and there is no need to have it reprogrammed at the dealership.

  • Up to 70 % cheaper than buying new from the manufacturer
  • Plug & Play – fit it straight away, drive straight away
  • Repair within 2–4 working days of receipt of the device
  • 24-month warranty on the repair work

Frequently Asked Questions

Does the device need to be reprogrammed after repair?
In most cases, no. The vehicle-specific coding remains fully intact following our repair. Should recoding be necessary in any individual case, we will inform you in advance.

What happens if the device 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.

How long will the repair take?
Standard repairs take 2–4 working days from receipt of the device. An express service is available on request.

Services

How does the repair process work at Revonik?

  1. Please fill out the repair order form and include it in the package.
  2. Pack the device securely and send it to us. We recommend shipping via DHL. No prior notification is necessary.
  3. We will perform a fault diagnosis. If the fault is one of the standard faults listed above, we will repair the part. If the fault is not a standard fault, we will contact you to discuss the next steps.

Prices for the repair:

  • 69,00 €Test
  • 269,00 €Repair
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2-year warranty

Bekannte Fehler & Codes

Manufacturers
Error code
Known errors
Mercedes
P0717
The speed signal from component Y3/9b3 (primary speed sensor) is not available
Mercedes
P0793
Speed ​​signal from component Y3/9b4 (secondary speed sensor) not available
Mercedes
P0739
The speed signal from component Y3/9b4 (secondary speed sensor) is not available
Mercedes
P0722
Speed ​​signal from component Y3/9b5 (output speed sensor) not available
Mercedes
P0723
The speed signal from component Y3/9b5 (output speed sensor) is implausible
Mercedes
P0720
Malfunction of the output speed sensor
Mercedes
P0741
The torque converter clutch cannot be engaged
Mercedes
P0842
The output voltage of the pressure sensor is faulty
Mercedes
P0843
The output voltage of the pressure sensor is faulty
Mercedes
P0896
Invalid setting of the reduction ratio in the CVT
Mercedes
P1634
Incorrect engagement of the hydraulic clutch
Mercedes
P2731
Incorrect engagement of the hydraulic clutch

Mercedes Teilenummern

Mercedes Teilenummern

A1695451062A0034462410A1693701106A1693700406A1693700506A1693700606A1693700706A1693700806A1693701006A1695451032