Will pcm throw wrong codes if it goes bad

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Mar 2, 2004 | 10:45 PM

SLeeper94Z

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Joined: Apr 2003

Posts: 532

Will pcm throw wrong codes if it goes bad

Lets say i get my car scanned and it throws codes , is there anyway if the ecm is damaged throw false codes, or a damaged wire harness throw false codes

Mar 3, 2004 | 12:14 PM

Hal Fisher

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Joined: Jun 2002

Posts: 798

From: San Jose, CA

Well it certainly could. Try pulling out the pcm with the harness while its running and move it around to see if codes start popping up then. Also, low voltage to it would cause them as well.

Hal

Mar 3, 2004 | 03:33 PM

madwolf

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Joined: Jul 2001

Posts: 4,577

From: DeKalb, IL

Quote:

Originally posted by Hal Fisher
Well it certainly could. Try pulling out the pcm with the harness while its running and move it around to see if codes start popping up then. Also, low voltage to it would cause them as well.

Hal

Yep, like he said, low voltage/bad ground could also cause this, but I've also seen many PCMs that were throwing a bunch of codes when they died.