What does code P1204 mean?

Q: What does code P1204 mean?

Cylinder 4 Injector Circuit Open/Shorted. P1204 on a Jaguar means the engine control module (ECM) has detected an open circuit or a short to ground or power in the electrical path for cylinder 4's fuel injector. The ECM commands the injector to fire but the current flow it measures is outside the expected range, so it flags the circuit as faulty. This is a circuit-level fault, not a statement that the injector itself has failed internally.

DTC codes / Jaguar codes / P1204

P1204 · JaguarCylinder 4 Injector Circuit Open/Shorted

P1204 on a Jaguar means the engine control module (ECM) has detected an open circuit or a short to ground or power in the electrical path for cylinder 4's fuel injector. The ECM commands the injector to fire but the current flow it measures is outside the expected range, so it flags the circuit as faulty. This is a circuit-level fault, not a statement that the injector itself has failed internally.

SystemPowertrain

Code typeJaguar specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering (injector circuits)

Guidance is general and written for Jaguar vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.