Ignition Switch On/Start Position Circuit
General electrical fault on the ignition switch On/Start (terminal 50 / crank) input. The ECM uses this signal to know when the starter is energised — without it the ECM cannot raise fuel and timing for cranking, the engine struggles to start or stalls right after.
Affected components
- Ignition switch
- Wiring harness
Common causes
- High likelihood: Open or shorted On/Start wire
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.