Injector Circuit Malfunction - Cylinder 1

Cylinder 1 fuel injector circuit malfunction. Check the injector connector for backed-out pins or corrosion. Measure injector resistance -- should be 11-15 ohms. If open or shorted, replace the injector. On EcoBoost engines, carbon buildup on direct injector tips causes sticking. Your dealer can confirm whether an open service bulletin or warranty extension applies to your VIN.

Injector 1 circuit open or shorted. Check the injector connector first for corrosion or damage. Measure injector coil resistance -- should be 11-16 ohms. If the resistance is correct, check the wiring from the ECU to the injector for an open or short circuit. Replace the injector with Denso if coil resistance is out of spec. Confirm the exact part for your year and engine with a retailer's fitment lookup or your VIN before ordering - these applications split by engine and build date.

Cylinder 1 injector circuit fault. Check the injector connector and measure resistance (should be 11-13 ohms). If the connector has oil contamination from a valve cover leak, clean and reseal. If resistance is out of spec, replace with an OE-quality ACDelco unit. Swap the injector with another cylinder to confirm the fault follows the injector. Confirm the exact part for your year and engine with a retailer's fitment lookup or your VIN before ordering - these applications split by engine and build date.