Powertrain
Definition only
Lights the check engine lamp
P287B: Shift Fork A Calibration Not Learned
Standardized SAE J2012 code · P28xx codes
What does P287B mean?
The TCM has not learned the end-stop calibration for shift fork A. Engagement positions cannot be commanded with full precision until adaptation completes.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Common causes
- High Adaptation lost after battery disconnect or TCM reset
- Medium Shift fork replaced without learn procedure
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P287B on the same make and model first.
P287B in the community
Ask about P287BNo one has posted about P287B yet
Share your vehicle, the tool you used and what you tested — the first thread helps everyone who searches for this code.
Describe your P287B problem