Question about 1995 Cadillac DeVille

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1996 Seville won't shift & other issues that started all at once

Rebuilt transmission 2 mths ago
Everything was fine until died while driving a few weeks ago.
Ended up replacing Fuel Pump, Fuel Filter, and Ignition module.
Battery drains overnight but tested good.
Transmission won't shift into higher gear.
Codes cleared that reappear as soon as ignition turns over are:
p0102, p0603, po753, p0758, p1645, and p1860 and RS0038

I know 102 is the MAF sensor so I replaced it with another but code still appears.

It is strange to me that all this happened at one time without it being a PCM problem and not the individual parts. That would be really coincidental, right?

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  • fieldert May 18, 2009

    My hunch was that this problem was a short somewhere and that all these codes had something in common that could at least narrow the search down to a singular circuit. I was right. The ECS fuse circuit is for the Shift Solenoids (codes 0753, 0758, 1860) the MAF (0102), Purge Solenoid (1645). When I found that, I checked the fuse and it was blown. Replaced the fuse, reset the codes, and all is good. At least so far. There still may be an issue with a bad battery and the cause of the blown fuse is unknown and may reappear; but, at least I know which circuit to diagnose and will not be changing out parts needlessly. Sometimes, common sense prevails. I hope this helps someone else.

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  • 18 Answers

Dont know what exactly is the problem but all those codes are not the problem the best way is to have some tranny shop to scan it they have the chips to go inside those codes and see which one is broken , i had simular problem all the codes came up i changed parts that i did not need to change but after i found a tranny specialist i paid for my 99 sts $250 changed couple speed sensors one lose wire and done , so be careful try some other mechanic.

Posted on May 18, 2009

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