GM tire size calibration function Error in 12.4.1

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  • SnapOnKid
    Senior Member
    • Jan 2011
    • 873

    GM tire size calibration function Error in 12.4.1

    I was playing with some new features with my 12.4.1 update and wanted to try this new feature out. I used a 2000 1500 Silverado and a 2005 1500 Silverado. I own both vehicles and took several screen shots during each step. I have only posted the most relevant for each vehicle.

    1. 2000 Silverado 1500 RWD Engine code T With Cable TB With Air injection.

    First attempt to calibrate a new size failed. See attached screen shot.

    After reading the tire size calibration First and then attempting to do this, it was successful and I verified by re-reading the calibration.

    2.Then went to a 2005 Silverado 1500 RWD Engine code N. Entered the correct new vehicle. Be advised this Vehicle has the factory equipped 275/55/R20 Just in case this has something to do with the error.

    Attempted to Read Tire Calibration first and got
    "The current tire size can not be determined. FFFF"

    Attempted to Write New Calibration and when you go to enter a new tire size It fails with an error. ***NOTICE*** the Error codes are different between the years

    Also Last but not least why does it display "Your tone ring has 55 teeth"??? Were is it getting this value from???
    Attached Files
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