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What's going on there ? As soon as I engaged D or P and press the accelerator above 1300 rpm the gearbox shifts to P.
Unfortunately it's not possible to upload MP4 videos.
Some future infos - 350 CDI OM642 - gearbox was flushed, and new oil and filter approx 11 months ago. Oil level ok. No limp mode, no CEL, only a notice, please take a look at the attached photo. Under normal circumstances the gearbox works ok, besides the all aware hard down shifts....
The strange behaviour started 10 day's ago, some days no issues and the day after not working properly. Until today, it was possible to solve the issue (temporarily) by switching the car on and off.
What's going on there ? As soon as I engaged D or P and press the accelerator above 1300 rpm the gearbox shifts to P.
Unfortunately it's not possible to upload MP4 videos.
Some future infos - 350 CDI OM642 - gearbox was flushed, and new oil and filter approx 11 months ago. Oil level ok. No limp mode, no CEL, only a notice, please take a look at the attached photo. Under normal circumstances the gearbox works ok, besides the all aware hard down shifts....
The strange behaviour started 10 day's ago, some days no issues and the day after not working properly. Until today, it was possible to solve the issue (temporarily) by switching the car on and off.
But today the luck stoped.
Any clue out there ?
Your ISM shifter module has developed loose connections internally. It is is built with pressed pins... aka. solderless pins.
Use your scanner to run tests confirmation it is acting goofy. You may inspect the connector for water intrusion if that can help save you a replacement.
This module works over CAN-C network. It benefit working well not to disrupt timings of ECU--TCU--ESP.
The solderless ISM module is direct contributor of delayed bangy gear shifts, even new working normally.
Last edited by CaliBenzDriver; Jun 30, 2025 at 02:14 PM.
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