trans will not gear down at a rpm increase no increase of speed on 2007 Mercedes-Benz ML320 CDI

I will stop the motor wait and then restart and all is fine till it happen sometime a month or maybe in a few days no check engine lite no warning atall..

by in Oroville, WA on August 15, 2013
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1 answer
ANSWER by , August 15, 2013
sounds like fail safe mode,have it ck'd at aamco for free then shop prices