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  1. How to: Recalibrate Speedometer with Forscan for 2021 Bronco

    The tire size is definitely related to things you have/use. I'm not sure exactly what all the PCM has a hand in, but if you read my above posts leaving that DTC on can cause drivability issues in certain vehicles that I suspect are due to a mismatch between the ABS wheel speed sensors, the...

  2. How to: Recalibrate Speedometer with Forscan for 2021 Bronco

    That's exactly what you want. You can't have two tire sizes programmed into the BCM, there's only one spot for it. By far the best way to get a dead-on speedometer is to use the GPS method though, not just the nominal tire size. Every SKU of a particular size of tire will likely vary by some...

  3. How to: Recalibrate Speedometer with Forscan for 2021 Bronco

    I don't follow. You can't put more than one tire size in your BCM.

  4. How to: Recalibrate Speedometer with Forscan for 2021 Bronco

    This happens on 2021+ F150's and 2020+ F250/350's as well. Not sure if it's affecting newer Mustangs yet. FORscan is not yet able to correctly initiate the PCM relearn on the newer models for some reason. It works fine on the older ones. I know this is of no help since there isn't an older...
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