Injector Circuit/Open - Cylinder 8
The Powertrain Control Module (PCM) has detected an open circuit or a malfunction in the electrical circuit for the fuel injector on cylinder 8. This code is set when the PCM monitors the injector circuit voltage or resistance and finds it falls outside the manufacturer's expected operating range.
Driving with a malfunctioning fuel injector can cause severe engine misfires, leading to poor performance and potential damage to the catalytic converter. It should be diagnosed and repaired immediately to prevent further drivetrain damage.
Common symptoms
- Illuminated or flashing Check Engine Light
- Engine misfire or rough idle
- Noticeable lack of engine power during acceleration
- Decreased fuel economy
- Engine stalling or hesitation
Likely causes
- Faulty or failed fuel injector on cylinder 8
- Damaged, broken, or shorted wiring in the cylinder 8 injector harness
- Loose or corroded electrical connector at the cylinder 8 injector
- Open circuit in the fuel injector power supply or ground circuit
- Faulty Powertrain Control Module (PCM) or injector driver
What to check before replacing parts
Inspect the cylinder 8 fuel injector wiring harness and connector.
Look for: Look for frayed wires, melted insulation, or a loose/corroded connector that could cause an open circuit.
Test the resistance of the cylinder 8 fuel injector using a digital multimeter.
Look for: Compare the resistance reading to the manufacturer's specifications; an infinite reading indicates an internally open injector that requires replacement.
Check for proper voltage at the cylinder 8 injector connector with the key on, engine off (KOEO).
Look for: You should see battery voltage (around 12V) on the power feed wire. Lack of voltage indicates a wiring issue between the power source and the injector.
Use a noid light to test the injector ground pulse from the PCM while cranking the engine.
Look for: The noid light should flash rapidly. If it stays off or stays on solid, there is a problem with the control circuit wiring or the PCM.
Perform a continuity test on the control wire between the injector connector and the PCM.
Look for: High resistance or no continuity indicates a broken wire in the harness that needs to be repaired.
This page explains the generic P0208 definition and is general reference information, not a diagnosis for your specific vehicle. Actual causes, severity, and repairs vary by make, model, engine, and mileage — always confirm with a scan tool and a qualified technician before replacing parts.
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