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2005 Transmission Issues

 
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Old 17 Aug 2013, 08:53 pm
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Join Date: Jul 2013
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Default 2005 Transmission Issues

OK. I'm at wit's end here. About a 6 months ago, my wife's PT would run and shift great from a cold start. But, if you stopped off at Walmart for a quick second to grab a gallon of milk, the car would go into limp mode. HOwever, if you stopped again and waited about 20 minutes it would work just fine again.

I figured it had to be a sensor issue of some kind, so I replaced both speed sensors, and replaced the filter and fluid. Didn't help. Error codes were still P0700, P1603, and occassionally it would also give a U0101 code. As we live in a rural town, and it isn't more than a couple of miles to get anywhere, my wife still drives the car, often times in limp mode (never more than 30 mph).

After researching for a while and waiting till I had time and $$ to get back into it, I figured it could be either the transmission control solenoid or the PCM. I opted to replace the control solenoid. Still has not fixed the problem. Error code after test drive was U0101 - which I believe is a communication problem between the solenoid, speed sensor and PCM.

So, do I have a bad PCM, or could it be something in the wiring harness or the connectors to the Tran Contrl Solenoid and the PCM? I fear I am throwing good money after bad and could really use some help getting this bugger solved.

Thanks for your help.
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Old 17 Aug 2013, 10:03 pm
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Join Date: Sep 2001
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Default Re: 2005 Transmission Issues

From what I can find, U0101 is loss of communications to the TCM (Trans Control Module), not the solenoid or PCM.

If you decide to replace that, the Haynes manual says: Do NOT interchange TCM's from different year vehicles.
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Old 17 Aug 2013, 10:07 pm
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Join Date: Apr 2013
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Default Re: 2005 Transmission Issues

My 04 Cruiser had problems with bogus engine codes. I replaced the PCM with a rebuilt unit. Two weeks later, the tranny had shift problems and was in limp mode quite a bit. I changed the solenoid pack (new Mopar unit), changed fluid and filter and nothing helped. I did a continuity wire check from the PCM to the solenoid pack and all wiring was fine. Then I changed the PCM (returned first unit to rebuilder) after they sent a replacement PCM. I installed the replacement PCM and tranny has been fine ever since. I wasted money on solenoid pack since "logic" said it was not the "rebuilt" PCM. The old solenoid pack was two years old.

Do a continuity check on the eight wires to solenoid pack. Do not forget to check the grounds in the engine compartment. If they check out, It is most likely the PCM
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