Powertrain, generic (extended)

P280A Transmission Range Sensor A Circuit Not Learned

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Learn procedure skipped after replacing sensor, gearbox or module
Learn run aborted, for example by low battery voltage
Learned values cleared by a software update
Sensor signal outside the learnable window

Symptoms

  • Warning lamp right after a repair or update
  • Engine does not start or gear display missing

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–250
Time0.3–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

transmission range sensor atcm

Related codes

P280BP0705P0706P2806

References: law.cornell.edu, fordservicecontent.com, static.nhtsa.gov.