Question about 2007 Mercedes-Benz GL320 CDI

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My gl320 jerking as if it is not getting enough fuel. It is with the oem at the moment but they can not seem to find the problem. It only happens when you accelerating when you put the pedal flat. if you accelerate slow it runs normal up to about 120km/h then it jums into limb mode.

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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

  • the ECU and transmission computer (TCU) for the latest firmware versions
  • transmission control sensors
  • if required, removal of the transmission pan for internal inspection
  • the ABS system for any oddities in operation
  • the torque converter
The ECU, TCU and ABS systems all interact in subtle ways that may not be mechanically obvious.

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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