How do we clear codes the computer module properly?

GLORIA MAHAFFEY

MEMBER
1999 BUICK PARK AVENUE
100,000 MILES

We recently had the transmission and battery replaced in our Buick. But, now the Computer is acting crazy. My husband and the repair guy say that its because the battery was completely drained. They tried resetting the computer however, it now cranks, runs for about 3 minutes then shuts off. They say its the Security device and that the computer module may have to be reset or even replaced by a dealership. I CANNOT afford that and cringe at the thought of what the cost might be. IS it at all possible to reset the Computer module or security part of the computer ourselves?

Sunday, March 11th, 2012 AT 10:54 PM

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
51,648 POSTS

It sounds like the battery was jumped backwards causing the computer to short out. I would try a used PCM to save money I believe you can plug and play without programming.

I would try to clear the codes using a code reader, here is a guide to help you

https://www.2carpros.com/articles/check-engine-light-clear-codes

The location of the PCM is under the hood on the drivers side. Here is a diagram (below) to help you find it

Please let us know what happens.

Cheers, Ken

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