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stp57
10-09-2013, 03:19 AM
I have a problem with my 2006 transmission (200K miles)& I couldn't find a similar problem or antidote on the forum. My problem seems to happen when taking sharp turns where the vehicle leans excessively, but occasionally it happens from a start up. When this happens the tranny gets stuck in whatever gear I was in at the time & I can't manually shift gears? I turn the vehicle off then back on & everything is usually fine.
I read Doc A's tranny plan & tried it on my last service job. I pulled the valve body & cleaned the speed sensor (one was covered with plastic so I am not really sure I cleaned it properly?) My tranny was real clean (it had 25K miles on it since I last serviced it) had no real metal like I have seen in some photos? There was just the usual fine metallic powder on the sensor & pan magnet, but very little. I didn't pull the solenoids because they were very clean.
After I put my trans back together it ran perfect regardless of how I turned, but for only 24hrs & now it has the same problem? I was told the fluid level might be low but the Sprinter specialist checked the dipstick & said it was fine. Should I have removed the plastic cover over the other speed sensor? Back to the drawing board?

Steve

Eric Experience
10-09-2013, 10:12 AM
Steve.
06 could be any model which one is it? If its a tin I would suspect the transmission control module under the drivers seat, unplug it and look for oil in the plug. lets know what you find. Eric.

bruceiam
10-09-2013, 11:05 AM
When the trans goes into limp home mode it usually stores a code. My guess is a speed sensor error. If you can find out what the code is it would help.

stp57
10-10-2013, 04:06 AM
Thanks guys, great advice. My Sprinter is a T1N.
Before I could use your advice my turbo shut down last night on the way home. I figured it was the intercooler hose, as usual. I keep a couple on hand, but when I went to change it I noticed that my serpentine belt was extremely loose & even riding off an idler pulley 1/2"? My first thought is the tension and/or idler pulleys are shot. I changed the tension pulley even though the old one looked fine. The old belt was just stretched out but not cracked?
After I put everything back together the transmission problem went away? How could a loose belt & a hole in the intercooler hose cause these symptoms?
Steve

Eric Experience
10-10-2013, 11:09 AM
Steve

It will be the clutch on the alternator that is causing your belt problem. Eric

Aqua Puttana
10-10-2013, 12:02 PM
... How could a loose belt & a hole in the intercooler hose cause these symptoms?
Steve
Some guesses.

A failing/loose belt could cause system voltage fluctuations. Transmission speed sensors, and many other sensors all need stable voltages to perform properly. Poor connections, bad batteries and other electrical problem history here shows that Sprinters are picky about proper voltage

Less likely.

Loss of of power related to a hose leak could cause operating issues before the computer notices enough to set LHM. Those operating issues could mimic transmission problems.

Or a combination of the above.

FWIW. vic

stp57
10-24-2013, 12:55 PM
Update:
After a trouble free week the problem returned & got worse.I had to drive 30 miles home in first gear. Mechanic replaced the circuit board in the valve body (includes the speed sensors) & problem fixed. He couldn't explain why the things I did earlier took care of the problem temporarily? What a shame all of that new trans fluid & filter went bye bye.
Steve