Park/Neutral Switch Input Circuit
The ECU detects implausible park/neutral position switch input. The signal does not match the gear lever position reported by the TCM.
Affected components
- Park neutral switch
- Wiring harness
- Tcm
Common causes
- High likelihood: PNP switch failed
- Medium likelihood: Switch misaligned
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
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.