Can a AC compressor cause pcu to go bad

Tiny
CMONSTER
  • MEMBER
  • 2004 PONTIAC GRAND AM
  • 100,000 MILES
I had my car in the shop a year ago because it wouldn't start. Come to find out the pcu was bad. They told me that the air compressor was the cause of it. I didn't have the money at the time to pay for that to. It didn't sound right anyways. They left it unplugged and said that would work
Wednesday, July 11th, 2012 AT 4:54 PM

12 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
NO total BS
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Wednesday, July 11th, 2012 AT 4:57 PM
Tiny
CMONSTER
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So I can plug it back in and everything will be fine? I just don't want to have to buy another
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Thursday, July 12th, 2012 AT 5:04 PM
Tiny
DOCFIXIT
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AC compressor is controled by a relay no direct connection to PCM. Where they saying comp locked up? AC working before no start? No start mean it cranked but would not run?
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Thursday, July 12th, 2012 AT 5:16 PM
Tiny
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It worked great before the no start. Yes it would crank all day and not start. They just said the comp was what caused the pcm to go bad
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Thursday, July 12th, 2012 AT 6:10 PM
Tiny
DOCFIXIT
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Story sounds fishy did check engine light come on? Security light? PCM rarely failes suspect fuel pump or cam or crank sensor was cause. May wany a second opinion not being able to see vehicle hard to say if all will be fine if plug Comp
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Thursday, July 12th, 2012 AT 6:15 PM
Tiny
CMONSTER
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  • 7 POSTS
Pcm and crank postion sensor was changed and works great now. I had no lights. Would run great before it was replaced if I disconnected battery for a few mins
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Thursday, July 12th, 2012 AT 6:20 PM
Tiny
DOCFIXIT
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Suspect crank sensor was fault the AC story makes NO sence and could not cause PCM to fail. This your regular shop?
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Thursday, July 12th, 2012 AT 6:26 PM
Tiny
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It was a place that was recommended to me. I had just moved and I do a lot of my own work on my cars. Just don't know anything with computers
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Thursday, July 12th, 2012 AT 6:28 PM
Tiny
DOCFIXIT
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So going to plug it in?
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Thursday, July 12th, 2012 AT 8:03 PM
Tiny
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  • 7 POSTS
Would you if you were me?
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Thursday, July 12th, 2012 AT 10:46 PM
Tiny
CMONSTER
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Would you do it if u were me
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Thursday, July 12th, 2012 AT 10:56 PM
Tiny
DOCFIXIT
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Yes
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Friday, July 13th, 2012 AT 2:31 PM

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