Mercedes 7 Speed Auto Gearbox Problems
Mercedes models that are fitted with the 7G-Tronic automatic transmission with gearbox code – 722.9 will often cause the transmission to hold too long in one gear before aggressively forcing the next gear into place, this causes a very rough and jerky gear change and is a very common fault.
Mercedes Gearbox Problems
Although the fault starts out as intermittent, if it’s not solved and left long enough it will become permanent. It’s caused by the TCM conductor plate breaking down internally, which makes it unable to determine the slippage of the torque converter. When this happens it will cause ineffective torque clutch lock-up that prevents a smooth gear change and in some worst cases it will prevent the gear selection entirely.
Mercedes Transmission Troubleshooting
Mercedes 7g Gearbox Common Failure symptoms:
- Intermittently not changing gear
- Gearbox goes into limp mode
- Sticking in gear
- Not selecting gears
When we diagnose the transmission fault we ensure the fault codes are read from the transmission system as a first point of call, as if the fault codes are stored for the internal speed sensors then it’s a good indication that it’s a faulty transmission control module/conductor plate.
Mercedes Rebuilt Transmission
At Essex Recons we aim to rebuild your own control unit within 1-2 working days as well as supply an unlimited mileage lifetime warranty.