Transmission Range Sensor A Circuit Not Learned
The TCM has not learned the calibration window for transmission range sensor A. Selector positions cannot be mapped reliably until adaptation completes.
Affected components
- Transmission range sensor a
- Tcm
Common causes
- High likelihood: Adaptation lost after battery disconnect or TCM reset
- Medium likelihood: Sensor replaced without learn procedure
Possible 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
Diagnostic notes
- The malfunction indicator lamp may illuminate
- A drive cycle may be required after repair
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.