Stuck in 1st Gear! Help Please!
Thread Starter
Newbie
Joined: Sep 2016
Posts: 7
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1999 Mercedes Benz CLK320
Stuck in 1st Gear! Help Please!
I recently bought a 99 CLK320. I've read that the car comes with a 722.6xx transmission. I replaced the Tranny gasket and filter. Also put in new fluid.. Long story short, I took it for a ride and it won't shift to 2nd. It goes into reverse and 1st no problem but will not shift to 2nd.
I've read that it could be one of the following.. TCM, ECU, Speed Sensor Control, Gear Shifter & Module, Valve Body, Throttle Position Sensor, or the Conductor Plate, O-Rings on the Conductor Plate Connector. Is there anything else I'm missing?
I've read that it could be one of the following.. TCM, ECU, Speed Sensor Control, Gear Shifter & Module, Valve Body, Throttle Position Sensor, or the Conductor Plate, O-Rings on the Conductor Plate Connector. Is there anything else I'm missing?
MBWorld Fanatic!
Joined: Nov 2001
Posts: 1,258
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From: Boston North Shore
2001 CLK320 Cabrio
Mechanically the 722.6xx quite bullet proof, with the vast majority of limp mode issues being due to the electrical modules (e.g. conductor plate, transmission control module, transmission sift module, speed sensor etc.).
As Plutoe suggested, diagnosis requires that you need to have your car scanned for fault codes, with the MB STAR diagnostic system.
I believe you'll find the link below, which starts with Part 1 of of a 6 part series regarding shifting problems, informative.
Note that even after proper diagnosis and parts replacement, you will need the MB STAR diagnostic system to clear any stored trouble codes (e.g. discussed in Part 4).
As Plutoe suggested, diagnosis requires that you need to have your car scanned for fault codes, with the MB STAR diagnostic system.
I believe you'll find the link below, which starts with Part 1 of of a 6 part series regarding shifting problems, informative.
Note that even after proper diagnosis and parts replacement, you will need the MB STAR diagnostic system to clear any stored trouble codes (e.g. discussed in Part 4).
