Neutral Input Circuit
General electrical fault on the Neutral input circuit — used by ECM/PCM to detect Neutral and adjust idle speed and start enable.
Affected components
- Neutral input circuit
- Wiring harness
Common causes
- High likelihood: Open or shorted neutral input wire
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.