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Thread: Differences in Silverado Flex fuel and non flex PCM pinning/harness etc

  1. #1
    Senior Tuner
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    Jun 2004
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    Differences in Silverado Flex fuel and non flex PCM pinning/harness etc

    Not sure if anyone might be able to answer this. Customer put a flex fuel 02 tahoe pcm in a non flex 01 Silverado I believe. He originally just brought it to me and asked to turn vats off so it would start. Did that, and now it starts, I thought he had the right PCM and harness just PCM from another vehicle was his problem

    Now he's saying it has the wiring harness from the 02 in it with the flex fuel plug just dangling... but its misfiring pretty good with 178 200 & 300 codes. Should I be able to do a reflash to non flex fuel program and it work ok? Not sure if there's any other differences in the harness and would need something in the harness changed?
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  2. #2
    Tuner Howes's Avatar
    Join Date
    Apr 2015
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    NH
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    130
    give me specifics on the 01 silv if u can. But for now. i am posting pinouts for both vehicles aptly named after what they are. hope it helps good luck! just print all 4 its on notepad and compare pinouts that way. if u need further wiring info. i check here almost every day. gotta love customers. i have a theory/billing philosophy. 65 /hour 85/hour if u watch. 105/hour if you worked on it first. happy friday!!
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    Last edited by Howes; 04-17-2015 at 08:24 PM.