Question about 2004 GMC Envoy

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PO606 in 2004 GMC envoy what does this mean - 2004 GMC Envoy

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  • GMC Master
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PCM Processor Fault. A couple of things, check the wiring around the PCM, check for frays in the wiring. There is a Technical Service Bulletin for this problem also, where your pcm would need to be re-flashed (computer update) by the dealer, I believe it's around $100 to do this.

You can also try to disconnect the battery for 30 minutes or so to reset the computer. Some people have just cleared the code by doing this (or with a code reader) and the code never showed back up again.

Posted on Mar 19, 2011

  • 3 more comments 
  • joyce halbakken Apr 08, 2011

    my mechanic put a fake code or info in the pcm, and it took it and my car started.. we just dont know how long it will stay running before it figures out that it isn't what was programed into it.

  • joyce halbakken Apr 08, 2011

    My 2003 Envoy xl, alot of electrical stuff is going on....the pbs dummy brake light came on..my heater fan stopped blowing and my clock and radio would quit speratically and then finally my car wouldn't even start. I had it towed to the dealership and they diagnosed it that the PCM no longer recognized my vehicle or something like that..so the mechanic reprogrammed a different code into it and my car started..HOW long do you think I can drive it before I actually have to replace the PCM part?

  • joyce halbakken Apr 08, 2011

    Type-o erroe...Not the pbs, but the PCM...thank you ..

  • joyce halbakken Apr 08, 2011

    I have heard that disconnecting the battery for "SOME TIME" can reset codes, on this van it worked to reset something with the transmission..our vehicle was only driving in second gear and reverse , something like that ....anyway..that worked.

  • Ryan Lutton
    Ryan Lutton Apr 08, 2011

    Try PCMFORLESS.com.......Try these guys, give them a call about your PCM. These guys are awesome for us Envoy and Trailblazer owners. These guys specialize in PCM's for us, you can send yours to them and they can either fix it or replace it. They can even send you a loaner while yours is being worked on.

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  • GMC Master
  • 14,036 Answers

CODE PO606 CONTROL MODULE INTERNAL PERFORMANCE CONDITIONS.POSSIBLE CAUSE THE PCM MUST BE REPLACED A NEW PCM HAS TO BE INSTALLED REPROGRAMMED WITH CORRECT SOFTWARE CALIBRATION.

Posted on Mar 19, 2011

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Posted on Jan 02, 2017

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SOURCE: We have 5 codes, po141,po172,po606,po014,po016

a lot of time it could just be a vacuum leak, look at all ur air lines also look at ur air flow sensor its in the air intake the big hose see if its oily if so clean it

Posted on Sep 13, 2011

  • 1311 Answers

SOURCE: 2004 gmc envoy code 0128

This an engine coolant temperature fault, most likely caused by a defective thermostat, probably one that is open all the time.

Posted on Sep 09, 2010

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