Transmission would not shift
06-23-2018, 05:46 PM
#1
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2007 GL450 Mercedes
Transmission would not shift
My car is 2007 GL450 Mercedes; sometimes the transmission will not shift and there is some humming noise I think from the transmission. Please do you know what the problem is?
Last edited by Jimoh; 06-23-2018 at 05:48 PM. Reason: to correct
06-23-2018, 06:03 PM
#2
Have you noticed any transmission fluid leaks from under the car? Try topping up transmission fluid..
You’ll need a laser thermometer to get the temp up to 42 degrees centigrade then unscrew the plug and pump in fluid until it starts to drain out the hole...
You’ll need a laser thermometer to get the temp up to 42 degrees centigrade then unscrew the plug and pump in fluid until it starts to drain out the hole...
06-24-2018, 10:46 AM
#4
I had the same issue. There is some sort of actuator in the transmission that goes bad. I was told that it is a known issue and replacement is a redesigned part. Had mine done at the dealer (under warranty) at about 60K miles - I purchased the 100k extended warranty, so no cost to me & I can't tell you what the cost really is... That repair was 155,000 miles ago. The repair requires removal.of the transmission pan, so it includes a transmission fluid service - which is a good thing. Hope that helps.
06-24-2018, 01:06 PM
#5
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Maybe is the ISM (Intelligent Servo Module), but before replacing it, is important to have the car scanned preferably with Star Diagnosis. Last year I had to replace and reprogram the ISM module of my GL500 of the same year of your car when it had approximately 50K miles.
