Mercedes-Benz W212 7G-Tronic automatic jerky and slipping shifts
E350 CDIE200 CDIE250 CDI220 CDI
W212 7G-Tronic jerks or shifts late - what can cause it?
Common causes are adaptation values that have drifted off (the driving style the transmission has learned), too little or old transmission fluid, and a leaking oil cooler. Fault codes usually do not appear, so the cause of the symptom must be found with a diagnostic tool.
Does resetting and relearning the 7G-Tronic adaptation values help?
It often helps, but not always: a reset alone can make operation better or worse. Teaching is done with the Mercedes diagnostic tool (STAR) on a test drive. Teaching with the key and the accelerator pedal does not reset the learned values.
What if the W212 automatic still slips or jerks after a reset?
First check the fluid level and condition, and the area around the cooler for a leak. Known faults are the KYB valve, wear of the torque converter lock-up and the wiring plate. Let a workshop diagnose the fault.
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