Transmission Park Position Sensor/Switch A Circuit Performance/Low
Sensor A is electrically intact but its low-end value drifts — for example a value below the calibrated Park threshold while the lever is mechanically out of Park. The TCM cannot fully trust the Park reading.
Affected components
- Park position sensor a
Common causes
- High likelihood: Aged Hall element with offset drift
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
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.