Transmission Park Position Sensor/Switch A Circuit Intermittent/Erratic
Park position sensor A signal jumps or drops out — typically a worn switch with contact bounce or a loose connector at the shift lever module.
Affected components
- Park position sensor a
Common causes
- High likelihood: Switch contact bounce
- Low likelihood: Connector with intermittent contact under vibration
- Low likelihood: Harness routed against vibrating component
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.