goenalex

My 2007 E550 was driving normal has about 110,000 miles on it in out of nowhere it shifted down to a believe first or second and will not shift into a higher gear it will not change from sport to comfort mode and can not change gears using the shifter anyone have experiences with this issue

vettdvr

Sounds like it went into failsafe get you home mode.

When my truck did this there was a relay failed in the PCM requiring a new PCM. The relays control the switching inside the transmission for shifting.

It may not be your pcm but some support part so you will need all the codes to determine where to look.

goenalex

When you say your truck was it a Mercedes-Benz truck or you're just generally speaking and if it was a Mercedes truck was it a similar year with a similar transmission and what the cost to fix

Plutoe

Wooooooooooooooooooooooooooooo slow down you have an MB transmission not a what ever---------your best course of action before all the BS is to get the transmission scanned to determing why it went into "limp mode"

However to do that you need someone with DAS Xentry diagnostic software or equal to be able to read the transmission module.

There is also an OBD code stored in the engine ECU alerting you to an issue with the transmission--that also has to be cleared!!

Barry45RPM

You need a valve body repair and/or conductor plate repair inside the transmission. I had the exact same symptoms/repair under ELW summer of 2012 at 65,000 miles.

goenalex

How much is a valve body repair and how much is a conductor plate repair and is this something that I'm better off having serviced at a transmission shop order Mercedes dealer?

Plutoe

Once again slow down-----you have an MB transmission with a conductor plate and on that conductor plate there are numerous removable shift solenoids-----one or more may not be functioning-----your issue is to find out which one is faulty and replace it----- not the conductor plate, however if the fault is because of a speed sensor which is built into the conductor plate---then you have to replace the conductor plate and clean and reuse your solinoids.

Barry45RPM

MB doesn't make all transmission parts available to all repair shops. I'd do arepair like this w/ diagnosis at the dealership.