Ignition Switch On/Start Position Circuit Low
The On/Start input reads stuck low — short to ground or permanently closed contact. The ECM may see crank request when the key is at rest, blocking accessory functions or causing unexpected starter cut-off logic.
Affected components
- Ignition switch
- Wiring harness
Common causes
- High likelihood: On/Start wire shorted to ground
- Low likelihood: Connector pins corroded - high contact resistance
- Low likelihood: Harness chafing through insulation
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.