Speedometer correction for larger tires

[Jimmy07]

Ive used Alfa obd ,tazer DT, and Diablo sports trinity 2 EX (not all together)
I can’t remember the exact size I entered on Alfa,I’ve since then reverted ecu back to stock tires because the code would bug me and I just allow for the difference in speed in my head now. But I googled the metric size of 295/65R20 and tazer and the trinity 2 allow you to enter the tire circumference in inches which I measured with a tape and entered.
The only way for me to clear the line mismatch code was to reset to a smaller tire.
And yes I have park assist.

And I’m not the only person who has ever had this happen. A simple google search will pull many other people with same issue. The jeep guys also report losing park assist. But that never happened to me. But it was annoying seeing that code every time I scanned my truck. So I learned to deal with the Speedo being off by 5 mph at 55 and above.

That is a known issue with the park assist module reporting that, hence why park assist gets disabled. It will happen if you adjust the tire size to over somewhere around 2700mm. You either have to stay under that number, deal with no park assist if it’s over, or use the Z automotive park sense fix cable.