SilverPigeon
Well-known member
A couple of easier ways:
1. Work out your tyre circumference in mm; π x dia. x 0.967 and use easy mode for the BCM to enter the tyre circumference in mm. Then run the "PCM reset all adaptations" in service procedures (spanner icon). If you end up with a DTC in the PCM, you need to use a smaller number in mm. This is because the PCM has a hard-coded limit for tyre size.
2. Work out the percentage you are out on the speedometer compared with a GPS app on your phone. Modify the above BCM setting for tyre circumference by that percentage. Then run the "PCM reset all adaptations" in service procedures (spanner icon). If you end up with a DTC in the PCM, you need to use a smaller number in mm for the same reason as above.
1. Work out your tyre circumference in mm; π x dia. x 0.967 and use easy mode for the BCM to enter the tyre circumference in mm. Then run the "PCM reset all adaptations" in service procedures (spanner icon). If you end up with a DTC in the PCM, you need to use a smaller number in mm. This is because the PCM has a hard-coded limit for tyre size.
2. Work out the percentage you are out on the speedometer compared with a GPS app on your phone. Modify the above BCM setting for tyre circumference by that percentage. Then run the "PCM reset all adaptations" in service procedures (spanner icon). If you end up with a DTC in the PCM, you need to use a smaller number in mm for the same reason as above.
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