Code result
P28EB
Shift Motor Position Not Learned
High severity
What it means
The TCM has not learned the end-stop calibration for the shift motor. Gear positions cannot be commanded with full precision until adaptation completes.
Is it safe to drive?
No — stop driving
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly.
Most likely causes
Adaptation lost after battery disconnect or TCM reset
highOne of the most commonly reported causes for this code — check this first.
Shift motor replaced without learn procedure
mediumA plausible cause — test and verify before replacing parts.
Related help
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