tildakrueger1
GLS Diesel Automatic Transmission Problem
Summary of the thread
A 2023 Mercedes GLS diesel is experiencing jerky shifting, a transmission warning light, and appears to be stuck in emergency mode. The issue may be linked to undervoltage, as a weak battery can affect the electronic control unit of the automatic transmission, causing erratic behavior. Checking and addressing the battery voltage resolved the problem, confirming undervoltage as the cause.
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4 comment(s)
tildakrueger1 (community.author)
Undervoltage, huh? Interesting. I haven't checked the battery specifically. Would low voltage really mess with the automatic transmission like that? Is it a common thing for these cars?
tommiller1
Yes, low voltage can definitely cause implausible shifting behavior. The electronic control unit for the automatic transmission is sensitive. If it's not getting the correct voltage, it can throw codes and put the transmission in limp mode. Check the voltage and get it properly diagnosed at a workshop if needed.
tildakrueger1 (community.author)
Thanks for the tip! Turns out you were spot on. The workshop found undervoltage was the culprit. Cost me 240€ to sort out. Appreciate the help!
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MERCEDES
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GLS
tommiller1
I had similar transmission problems with my GLS. Check for undervoltage. A weak battery can cause all sorts of weird issues with the automatic gearbox. Has the battery been tested?