Question about 2007 Mercedes-Benz GL320 CDI
Surely it's still under warranty.
I assume this is an automatic transmission.
You say it jumps into "limp" mode, which might mean a transmission problem. An ECU problem generally switches the ECU control to open-loop mode, which usually results in a loss of power rather than jerking.
The jerking under full load suggests to me that the transmission is "hunting" i.e. switching between adjacent gears because of a mechanical, hydraulic or electronic problem.
The Mercedes technicians KNOW what they are doing, and will be checking
You must understand that they will be reluctant to replace or rebuild the transmission unless they are absolutely certain of the necessity. They may also be unable to duplicate the problem. This is not uncommon.
Posted on Jan 04, 2011
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Posted on Jan 02, 2017
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