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M-Class (W163) 1998-2005: ML 230, ML 320, ML 350, ML 400 CDI, ML 430, ML 500, ML 270 CDI

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Old 10-01-2004, 03:27 AM   #1
Join Date: Oct 2004
Posts: 2
ML320 Shifting Problems, Codes Available. HELP!

After going through the many threads regarding transmission issues, I have yet to pinpoint exactly what my problem is. I have a 99 ML320, that is out of warranty. A very good friend of mine is a ASE master technician and he is helping me repair the vehicle. He has the scantools to extract tranny codes, so I have those codes available to anyone who could help me out.

Anyhow, a couple months ago, every couple of days the car would either not shift up into a higher gear, stuck in 2nd gear it seems, or get stuckin 3-4th gear, and will not downshift when vehicle has slowed down to a stop. This means at a stop light it would accelerate extremely slow due to the higher gear. I would then turn the car off and turn it back on, and the problem would be gone. Back to normal.

A couple of days ago, the problem has came back, but this time, it is here for good. I tried turning off and back on to no avail. So right now, it wont upshift past 2nd gear. I initially presumed it was limp mode related, but my friend says a code related to the RPM sensor is being indicated in the check engine light.

He is a very talented technician, but has limited knowledge regarding new MBs. I was hoping someone here experienced the same problem and could help me out. I would hate to bring it to dealer and deal with those sharks.

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Old 10-01-2004, 06:44 PM   #2
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I would love to help, but you wouldn't want me to because I work at a dealer and that makes me a shark.
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Old 10-01-2004, 07:40 PM   #3
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Originally Posted by saturnstyl
I would love to help, but you wouldn't want me to because I work at a dealer and that makes me a shark.
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Old 10-02-2004, 03:45 AM   #4
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Originally Posted by saturnstyl
I would love to help, but you wouldn't want me to because I work at a dealer and that makes me a shark.
I apologize for sterotyping dealerships, but while my vehicle was under warranty, I had brought it in over 10 times for warranty service, and received the worst service ever. Walnut Creek, CA MB that is. Unless I was paying for the service, they treated me like dog meat. As if I wanted all of these warranty problems.

It could be dealer specific, but I hear just as bad things at the Pleasanton dealership. Believe me, I am not the type to hate on dealership employees as I was one in the past. I was a salesman for VW back in the day. I saw some fairly shady business practices by upper management to squeeze peoples pockets... but then again, that could just be the dealer I worked at. But all I know is that they didn't get rich by playing nice.

Anyways, if anyone has any ideas, I'd greatly appreciate it. Thanks again.

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Old 02-05-2006, 07:11 PM   #5
Join Date: Dec 2005
Posts: 12
I don't have a clue as to what your problem is buy my first experience with a MB dealer was at the Walnut Creek dealer and I was very impressed with their quick, and accurate warrenty fix. If I could, I would go back to them but I live on the other side of the continent.
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Old 02-22-2006, 09:03 PM   #6
Join Date: Feb 2006
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Not that I really know anything about ML transmissions (well it's the only thing that hasn't broken in mine), but maybe have the transmission's software updated to the latest version??? I wouldn't change the ATF unless it's foamy or some color it's not supposed to be.
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Old 02-22-2006, 11:38 PM   #7
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Do you have the code numbers. If it is a RPM sensor, it is most likely the speed sensor built into the conductor plate assy.
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Old 02-22-2006, 11:38 PM

1998, 320, acceleration, check, conductor, engine, gear, light, limp, ml, ml320, plate, slip, slow, stuck, transmission, upshift, w163

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