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Pete
Pete, Mercedes Mechanic
Category: Mercedes
Satisfied Customers: 25801
Experience:  Over 15 years experience as a Mercedes dealer technician
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I have 2004 CLK500 with 25K miles. 20K service was performed

Customer Question

I have 2004 CLK500 with 25K miles. 20K service was performed at a Mercedes dealer. Transmission does not always shift up in a timely manner. I can manually shift it up. Do you have any suggestions? Thank you. John D.
Submitted: 1 year ago.
Category: Mercedes
Expert:  Pete replied 1 year ago.

Hi my name is ***** ***** I will be happy to assist with this here today.

If a transmission service was not performed this may be a fault with debris in the transmission fluid causing improper operation of the valve body components in the transmission.I have seen this occur before.In this case a transmission flush/service will free up and remove debris from the transmission and correct this here.

The other issue is a fault with the valve body itself not operating properly.I have had to replace the valve body before for issues like this as well.Usually the check engine light will come on if this is a valve body fault or sensor or solenoid fault needing replaced so it may not need any repairs just a flush to free up and remove debris from the transmission and new fluid added then the transmission adaptations relearned.

The adaptations are relearned with a scan tool plugged into your vehicle that can communicate with the transmission computer and that can perform the adaptation reset.Normally this can cost around $300 or more in some cases to have the fluid changed and the adaptations reset.

This will have to be checked into further best done by a dealer or transmission repair facility that works on Mercedes vehicles to pinpoint and repair the fault here.

Let me know if you need anything else and feel free to rate my help.

Thanks Pete