Transmission control unit CVT VGS 722.8 

The TCU Temic VGS 722.8 is a CVT model that often requires repair in Mercedes A- and B-class vehicles. These models were produced between 2003 and 2013. The mechanics at ABS-Stuurapparaten in Heemskerk are familiar with the various operations and revisions needed to get your Mercedes' CVT or TCU running optimally again.

TCU 722.8 repair: Possible error codes

For a Mercedes TCU repair, there are two aspects that determine the mechatronics: mechanical and electrical. The operation of the CVT is controlled by mechatronics. The mechanical part is the labyrinth of channels and valves that control various components within the CVT. The electronic part is the Temic VGS. If error codes for internal speed sensors are stored here, this is a very good indication of a defective transmission control module. When your vehicle's ECU is scanned with diagnostic equipment, you will see the most common error code:

The most common problems and error codes in automatic transmissions:

Mercedes A-class W169 & B-class W245

• Consult transmission workshop: Display
• P0793 – Y3 / 9b4 The speed signal (CVT (continuously variable automatic transmission) speed secondary sensor) not available,
• P0722 – Y3 / 9b5 The speed signal (CVT (continuously variable automatic transmission) speed secondary sensor) not available,
• P0896 – Invalid adjustment range CVT,
• P0794 – Display of the secondary sensor of revolutions (Y3 / 9b4), maximum value exceeded,
• P0717 – Y3 / 9b3 signal revolution speed element (CVT (continuously variable automatic transmission) revolution speed primary sensor) not available
• P0794 – Display revolutions primary sensor (Y3 / 9b3), maximum value exceeded,
• P0730 – Gear ratio in continuously variable automatic transmission CVT not permitted,
• 2722 Impermissible closing of hydraulic brake
• 2723 Impermissible opening of hydraulic brake
• 2731 Impermissible closing of hydraulic clutch
• 2732 Impermissible opening of hydraulic clutch

TCU Mercedes-Benz 7G-Tronic

This TCU is an automatic transmission and was the first with seven gears for passenger cars in 2003. These were produced for Mercedes by Continental. This TCU is also part of the mechatronics of the gearbox. When scanned by diagnostic equipment, the following error codes may appear:

Possible Error Codes

• 0721 – The signal from component Y3/8n3 (Output speed sensor VGS)
• 0717 – The signal from component Y3/8n1 (Turbine speed sensor VGS)
• 0722 – The signal from component Y3/8n3 (Output speed sensor VGS)
• 2767 – The signal from component Y3/8n2 (Internal speed sensor VGS)

Y3/8N1 – Turbine speed sensor

• P0717 – The signal from component Y3/8n1 (Turbine speed sensor (VGS)) is not available
• P0718 – Component Y3/8n1 (Turbine speed sensor (VGS)) is defective

Y3/8N2 – Internal speed sensor

• P2200 – The signal from component Y3/8n2 (Internal speed sensor (VGS)) in not available
• P2201 – Component Y3/8n2 (Internal speed sensor (VGS)) is defective
• P2767 – The signal from component Y3/8n2 (Internal speed sensor (VGS)) in not available
• P2768 – Component Y3/8n2 (Internal speed sensor (VGS)) is defective

Y3/8N3 – Output speed sensor

• P0722 – Output Speed Sensor No Signal
• P0723 – Output Speed Sensor (VGS) is defective

Y3/8S1 – Shift position sensor

• P0705 – Transmission Range Sensor Circuit Malfunction
• P2716 – Pressure Control Solenoid “D” Electrical

TCU Mercedes-Benz 9G-Tronic

Symptoms of a damaged 9G-Tronic control unit: Errors related to: turbine wheel speed sensor, internal transmission speed, output shaft, parking lock position sensor, lubrication pressure solenoid, clutch operation, multi-disc brake operation, operating pressure and converter lock-up clutch.

Possible Error Codes

• P07B700 - The pressure sensor signal is invalid
• P073E00 - Reverse gear does not engage
• P07B7 - Pressure sensor signal implausible
• P073E - Reverse gear is defective

What is our service based on?

Repairing the control unit in a Mercedes means diagnosing and eliminating all problems and malfunctions that may occur in this system.

• Troubleshooting: The first step is to identify a problem with the transmission control or other ECU-controlled functions. This includes error messages on the onboard computer such as a transmission error message, shifting problems, or other irregularities.
• Reading trouble codes: The technician reads the error codes from the ECU's memory, which can provide information about the cause of the problem. Diagnostic tests:
• Diagnostic tests are performed to check the operation of various transmission components, such as gear position sensors, solenoids, speed sensors, and more. This helps in determining the specific cause of the problem.
• Repair or replace damaged components: If a damaged component, such as a sensor or solenoid valve, is identified, a technician can repair or replace that component.
• Software updates: Often, ECU software updates can resolve certain transmission issues. A technician can perform a software update to improve performance and eliminate bugs.

Repairing the controller can be a complex process, requiring advanced knowledge and appropriate diagnostic tools. Therefore, it is generally recommended to use the services of a qualified technician or workshop specializing in Mercedes-Benz vehicles.

Make an appointment for your car's diagnosis

Do you want a TCU repair for your Mercedes? Then make an appointment with ABS-Stuurapparaten in Heemskerk, the specialist in electronics. Our mechanics will repair the identified fault messages in your transmission. Do you have further questions or want to know more about our working method? Please contact us via our contact form.

You will receive a 2-year warranty from us on a repaired part.

The part you send us will be repaired by us. Because you receive the same repaired part back, you avoid unnecessary installations and coding of your vehicle.