P280ATransmission Range Sensor A Circuit Not Learned
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P280A means the module holds no valid learned reference for range sensor A, so it cannot translate the raw signal into a reliable selector position. This is typical after replacing the sensor, the gearbox or the control module, after a software update, or when a learn run was aborted. No manufacturer documents this code publicly; CARB 13 CCR 1968.2 only requires that transmission inputs are checked. Why learning matters is shown by Ford's 2019 hybrid summary, which accepts each selector position only inside narrow voltage windows of the sensor, and by Audi bulletin 2051686, which calls for all basic settings after a new TCM and position sensor. A relearn with a scan tool is normally the fix. P280B is the B side.
- What you may notice
- Warning lamp right after a repair or update
- Engine does not start or gear display missing
- Likely causes
- LikelyLearn procedure skipped after replacing sensor, gearbox or module
- PossibleLearn run aborted, for example by low battery voltage
- PossibleLearned values cleared by a software update
- RareSensor signal outside the learnable window
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.