Continental 7G-tronic (722.9) First, Second and Third Generation

Continental 7G-tronic (722.9) First, Second and Third Generation TCUs

Common problems

P0705 - Transmission Range Sensor (TRS) Circuit Malfunction
RPM sensor faults - Fault codes: 0717, 0718, 0722, 0723, 2200, 2201, 2204, 2205, 2206, 2207, 2767, 2768; transmission in limp-home mode (occasionally)

How we work

We remanufacture the part you send. Prices are exclusive of VAT and possible shipping costs. Offer only applies to garages and dealers and not to individuals.

Let’s repair an 7G-Tronic(722.9)TCU

Found on the majority of Mercedes vehicles, the 7G-Tronic is the equivalent of the DSG mechatronic for Volkswagen Group vehicles. The 7G-Tronic was first introduced in 2003 on all Mercedes models with 8-cylinders that had a seven-speed gearbox. Because it was lightweight and reliable, the TCU and gearbox were soon added to certain 6-cylinder diesel engines as well. Despite being used as a seven-speed gearbox, the 7G-Tronic in-fact has nine gears - seven driving gears and two reverse. The two reverse gears were introduced to give the car an easier and more comfortable drive when using reverse.

Common faults and fault codes

The 7G-Tronic is located on the valve body inside the gearbox, it is likely to encounter prolonged periods of intense heat that can build up within the gearbox. Because of this, it is likely that the TCU could develop various kinds of faults over time, causing the vehicle to suffer from:

Vehicle will not start

Poor or unable to change gears

Sudden loss of drive when driving

Clutch slipping

These faults could be caused by a series of varying fault codes, which could include:

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 Other internal speed sensor error codes: P2204, P2205, P2206, P2207
Y3/8N3 – Output speed sensor
P0722 – Output Speed Sensor No Signal
P0723 – Output Speed Sensor (VGS) is defective
Y3/8S1 – Transmission range sensor
P0705 – Transmission Range Sensor Circuit Malfunction
P2716 – Pressure Control Solenoid “D” Electrical

Remanufacturing process

When sending in the 7G-Tronic we only require the TCU plate and not the (metal) valve body it is attached too. We will always test the TCU on a gearbox set-up to simulate the unit like it is on the vehicle. Testing it first enables us to confirm if we are able to find the reported fault(s) with the unit.

If we do find faults with the TCU, we will conduct a full remanufacture of the unit. We will always follow this with an End of Line (EOL) test which will allow us to approve that the remanufacture has resolved all the reported faults.

Other potential faults

It has been known that failures elsewhere on the vehicle can produce the same or similar faults to the 7G-Tronic. We will always suggest technicians to complete full testing before sending any unit to us, which should include – full diagnosis check, checking for broken or corroded wires, faulty sensors or mechanical damage to the gearbox itself. If you believe the 7G-Tronic to faulty, please continue and complete the Remanufacture Order Form.