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It is rare, but in theory these sensor problems can also be caused by a deviation at the magnetic sensor rings. Think of abnormalities such as damage to and/or iron grinding of the ring. So it is always a good idea to check them properly.
These error codes normally appear as soon as the software detects a problem through the signals from the speed sensors. If a speed sensor is not working properly, these error codes can be activated incorrectly. If these error codes appear in combination with the error codes from the previous table, have the TCU remanufactured first and delete all error codes after assembly. There is a good chance that these error codes will stop appearing after that.
If error code 2806 is active, the diagnostic device will not display the switching positions. The TCU will have to be re-taught. If the fault persists, the switching position sensor is defective. We can replace these during remanufacture.
If in doubt, please contact our Customer Service.
When the car is in limp mode: This error code indicates (extreme) wear of the lockup clutch. Assuming that the temperature measurement is correct: check whether the magnets in the sump pan are full of (iron) swarf. If this is indeed the case, then it can be assumed that the lock-up clutch is really damaged. It is advisable to replace the entire gearbox including the torque converter, because the iron swarf has now spread throughout the entire transmission.
In addition, the oil cooler needs to be flushed However, if the oil cooler is equipped with a thermostat, rinsing is not possible. The oil cooler must therefore be replaced.
When the car is in limp mode: The above error codes may indicate one or more defective solenoid valves, but the problem may also be somewhere else.
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.
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:
These faults could be caused by a series of varying fault codes, which could include:
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.
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.
0244424 | 5WP2101...
3068942 | 3173054...
4883104 | 5WP2 13...
5WP2 1012 k02 | A...
5WP21101 | A 033...
A 000 270 17 00
A 000 270 26 00
A 000 270 30 00
A 000 270 34 00
A 000 901 80 08
A3C0016410000
VGS3-NAG2
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