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how to calibrate speedometer (change tire size) on 2021 Jeep Grand Cherokee WK2 using AlfaOBD

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I can't remember what I had for breakfast this morning, fair enough.


I heard back from Alexey at AlfaOBD, and he confirmed that the "ABS Initialization" procedure doesn't do anything itself, it just holds the instructions on how to run the whole process. From all the videos I've seen the Android version lets you click start, but it doesn't actually do anything. On Windows, the "START" option is greyed out and can't be clicked. I completed the rest of the procedure as normal, and everything worked! My speedo is now correct (I think I'm about 1/2 MPH off at 80, but close enough) and I'm not getting any lights or trouble codes.


Thanks again for the write-up, super helpful!

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