MERCEDES 7SP GEARBOX FAULT
This is a very common fault for Mercedes vehicles fitted with the 7G-Tronic automatic transmission with gearbox code – 722.9, often causing 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.
The fault usually starts out as intermittent but always becomes permanent if left unresolved for long enough. The fault is caused by the TCM conductor plate breaking down internally, preventing the control module/conductor plate from monitoring the correct rotational speed of the input shaft, making it unable to determine the slippage of the torque converter, causing ineffective torque clutch lock-up that prevents a smooth gear change or in some cases prevents gear selection entirely.
This 7G-Tronic (722.9) control module is a common failure for the following 7 speed vehicles:
C-Class – C200, C220, C230, C250, C280, C320, C350, C63 AMG
CL-Class – CL500
CLK-Class – CLK280, CLK320, CLK350
CLS-Class – CLS320, CLS350, CLS500, CLS63 AMG
SLK-Class – SLK280, SLK350
E-Class – E200, E220, E280, E320, E350, E500, E63 AMG
GL-Class – GL320, GL420
CLK-Class – GLK220
ML-Class – ML280, ML320, ML350, ML420, ML500
R-Class – R280, R320, R350
S-Class – S320, S350, S430, S500
SL-Class – SL350, SL500
SLK-Class – SLK250, SLK280, SLK350
We are Mercedes Specialists in Essex and use manufacture software so we can diagnose and repair these faults.
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