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1991 Plymouth Acclaim Code 12412555

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ken adams
New User

Jul 31, 2006, 4:37 PM

Post #1 of 2 (2439 views)
1991 Plymouth Acclaim Code 12412555 Sign In

My car battery went dead after I had an E-Test done. As I was driving home the check engine light was on which they told me was normal after an e-test. The radio turned off and on a few times then I noticed averthing was strating to fade. The battery was slowly dieing. At first I thought it was probably the alternator or its belt. But then I thought it just might be a loose connection but I couldn't find any. Does anyone know anything else it could be before i pay the money for an alternator. It's flashing the following code with the check engine light.
12 41 25 55 (I'm thinking 12 and 55 are start and stop diagnostic mode codes from a previous thread, so I just ned the other two) Does anyone know this info or where to find it. I tried googling but to no avail.
Any help would be greatly appreciated.

First time user.



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DanD profile image

Aug 2, 2006, 3:53 AM

Post #2 of 2 (2428 views)
Re: 1991 Plymouth Acclaim Code 12412555 Sign In

You’re right that 12&55 are the beginning and end of codes.
Code 41 relates to Alternator field circuit: this doesn’t necessarily mean that the alternator is bad but that the computer has seen an open or short in that circuit. You’ll need to test the alternator itself by taking the computer out of the circuit to determine whether it’s the alternator, wiring to or the computer not allowing the alternator to function. The computer houses the voltage regulator and in these years of Chryslers and they were know for burning out causing the battery to drain.
Code 25 relates to the AIS (automatic idle speed) circuit: again this could be in the wiring, computer or the most likely, the idle speed control motor. There are a number of tests to confirm which it is and that is if the short or open is willing to show itself during the test. Intermittent shorts and opens are the hardest to find.
For the charging system problem if it turns out to be in the computers voltage regulator there is a way of by-passing it and installing an older external regulator. Maybe bring this up when you’re talking to the people checking this for you.

Canadian "EH"

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