1995 Bonneville SE Trouble - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 05-03-2007, 05:58 PM   #1
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Default 1995 Bonneville SE Trouble

I finally changed the tranny in my '95. Now it runs and drives...

But after we got it back together, it just kills the battery when you run it. You can see the voltage go (like it is charging) then it drops to basically zero then goes back up, over and over till it is completely dead.

I ask my brother if he hooked the wiring harness back up correctly, so he unhooks it and there is a pin bent over. I straightened the pin and plugged it back in, but it is still doing it and I am getting a bunch of codes.

257 Boost Control Failure (overboost)
325 ESC Failure
623 PROM Error
640 QDM 1 Failure
650 QDM 2 Failure

I have been trying to figure out what all these codes mean, but I can only come up with one explination. Bad computer, possibly shorted when the pin was bent?

I just hate to spend $100+ on a new computer and have that not be the problem.

Any ideas? Help me, I miss my Bonny :(
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Old 05-03-2007, 06:31 PM   #2
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Is your ground cable properly tightened down?

How old is the battery? The battery sounds like the suspect.
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Old 05-03-2007, 08:11 PM   #3
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i thought it might be the batterytoo, but i used another battery that is pretty much new and it did the same thing
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