M275 V12 Bi-Turbo Platform Technical discussion relating to models sharing the M275 V12 Bi-Turbo (V12 TT). Including SL600, SL65 AMG, CL600, CL65 AMG, S600, S65 AMG.
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transmission problem - CEL

Old 10-29-2017, 05:26 AM
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transmission problem - CEL


today, a very weird thing happened to me. I was cruising at a speed of 50 km/h when the CEL came on on the car (W221 S65) stopped accelerating. It took some time before the transmission allowed me to select a gear again and continue driving.
I returned back home and checked for errors with Xentry. Of course there was one fault code for the transmission control unit.
Translated in english the error said: "improper transmission gear ratio", which I find very weird. The transmission is completely stock and I never had any problem before.
Does anyone have an idea what possible reason there might be for this fault code?

Last edited by black-series; 10-29-2017 at 06:07 AM.
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