claraeagle21
Mercedes GLC Automatic Gearbox Problem
Summary of the thread
A 2017 Mercedes GLC diesel is experiencing incorrect shifting in its automatic gearbox, with the transmission indicator light on and the vehicle stuck in emergency mode. The issue may be caused by worn-out transmission oil or an undervoltage problem affecting the gearbox system. A suggested solution is to have the vehicle checked by a workshop, where a transmission flush and oil replacement can be performed to resolve the issue.
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4 comment(s)
claraeagle21 (community.author)
Undervoltage? I didn't really notice anything specific, but maybe something subtle. What did you end up doing to fix it?
ninaroth27
Undervoltage can apparently throw the whole automatic gearbox system for a loop. My mechanic said it can cause all sorts of weird electronic gremlins. I'd suggest getting it checked out by a workshop ASAP. They'll probably recommend a transmission flush and oil replacement, but it's best to get a proper diagnosis. Don't want to risk further damage to the automatic transmission.
claraeagle21 (community.author)
Took your advice and brought it to a shop. It WAS undervoltage messing with the transmission. They did a transmission flush and replaced the oil. Cost me 240€, but it's shifting smoothly now. I appreciate the help.
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ninaroth27
That sounds rough. I had almost the exact same thing happen with my GLC: implausible shifting behavior. Did you notice any undervoltage issues before this started, like dimming lights?