Ignition Switch On/Start Position Circuit High
The On/Start input reads stuck high — short to battery voltage. The ECM cannot read the crank state, modules dependent on this signal are unable to time their wake-up correctly.
Affected components
- Ignition switch
- Wiring harness
Common causes
- High likelihood: On/Start wire shorted to battery voltage
- Low likelihood: Connector pins corroded - high contact resistance
- Low likelihood: Supply wire pinched against B+ source
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.