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Thread: Stock read vehicle info

  1. #1
    Potential Tuner
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    Sep 2020
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    Stock read vehicle info

    Good morning all,

    I just did a stock read on a 2012 GMC Canyon. I'm just getting started with HP Tuners and was going to do the tire size change. Figured I would start slow and work my way up. My problem is that the read shows the wrong rear end ratio. It shows 3.73:1 when the truck has a 3.42:1 ratio. I want to change the tire size to 29" as that is what is on the truck currently. Do I need to change the gear ratio also or leave it as is? I've attached the tune file.

    On a second note, I get a P0606 error from reading the ecm.

    Thank you.
    Attached Files Attached Files

  2. #2
    Tuning Addict 5FDP's Avatar
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    May 2012
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    Rogers, MN
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    Is the RPO code in the glove box GU6 or GT4??
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

  3. #3
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    Sep 2020
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    The code is GT4.

  4. #4
    Potential Tuner
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    Sep 2020
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    Well, that answers it! It's a 3.73 rear. I never looked after I bought the truck new. I was told it was a 3.42 rear. Thank you for the help!

  5. #5
    That P0606 code indicates an internal fault in the PCM. You might start looking for a spare PCM at the junk yard or online.

    Rick
    1970 Chevrolet El Camino LM7 5.3 liter mill and a 4L60E transmission.

  6. #6
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    Sep 2020
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    Thanks for the info. I was thinking that is the case. I was just hoping it was a strange occurrence with the E67 PCMs that just show up with that error. Kinda disappointing because I just read it and used my credits to change the tire size.