Spart
Well-Known Member
The DTC doesn't hurt anything. My buddy's F150 has been running all winter with the tire size set via FORScan, and he's had no issues with the ABS, traction control, or stability control. I mean, if you're OCD and you can't bear the thought that somewhere deep in the car an error is being thrown that doesn't even merit a CEL, then you might suffer some emotional trauma.Unfortunately, using the method of changing via ForScan does cause a DTC to be set without illuminating the CEL, since the value does not match what the PCM expects to see. Using your programmer fixes the PCM as well, so no DTC is set.
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