P1213: Start Injector Circuit Malfunction

P1213 indicates a malfunction in the start injector circuit, a component used on some engines to assist cold starting by injecting extra fuel directly into the intake manifold. The ECU monitors this circuit and logs P1213 when it detects the circuit is not operating as expected, whether that is an open, a short, or a signal that falls outside normal parameters during the start sequence.

The fault can stem from a failed start injector, a wiring problem in the injector circuit such as a short to ground or broken wire, a faulty injector relay, or a corroded connector at the injector itself. Begin diagnosis by checking the injector's resistance with a multimeter against the manufacturer's specification, then inspect the wiring harness for visible damage and verify the relay is functioning correctly.

This is rated high severity because a start injector fault directly affects the engine's ability to start, particularly in cold conditions. If the engine is struggling to start or cranking for longer than usual, P1213 is a likely contributor. Get it diagnosed and repaired without delay, as continuing to crank with a fuelling fault can cause further issues.