Injector Circuit/Open - Cylinder 7
The P0207 code indicates that the Powertrain Control Module (PCM) has detected an open circuit or malfunction in the fuel injector circuit for cylinder 7. The PCM sets this code when it monitors the voltage or resistance of the injector circuit and finds it falls outside the manufacturer's expected operating range.
A malfunctioning fuel injector will cause a severe misfire, leading to poor performance and potential catalytic converter damage. It is highly recommended to diagnose and repair this issue immediately to prevent costly secondary damage.
Common symptoms
- Illuminated or flashing Check Engine Light
- Engine misfire or rough idle
- Noticeable lack of engine power and poor acceleration
- Decreased fuel economy
- Strong smell of unburned fuel from the exhaust
Likely causes
- Faulty fuel injector on cylinder 7
- Damaged, broken, or disconnected wiring in the cylinder 7 injector circuit
- Corroded or loose electrical connector at the cylinder 7 injector
- Open or shorted fuel injector harness
- Failing Powertrain Control Module (PCM) or injector driver (rare)
What to check before replacing parts
Visually inspect the wiring and connector for the cylinder 7 fuel injector
Look for: Look for disconnected, frayed, or melted wires, and check the connector for corrosion, pushed-out pins, or moisture.
Listen to the injector operation
Look for: Use a mechanic's stethoscope to listen for a rhythmic clicking sound from the cylinder 7 injector while the engine is running. Silence indicates the injector is not firing.
Test the fuel injector resistance
Look for: Use a multimeter to measure the resistance across the injector terminals. Compare the reading to factory specifications (typically 10-18 ohms); an infinite or out-of-spec reading indicates an internally open or shorted injector.
Check for supply voltage at the injector connector
Look for: Disconnect the injector and use a multimeter to verify that battery voltage (approximately 12 volts) is present at the feed wire when the ignition is in the ON position.
Test the ground pulse signal from the PCM
Look for: Plug a noid light into the injector harness connector and crank or run the engine. A steady, rhythmic flashing light confirms the PCM and wiring are delivering the proper ground signal to fire the injector.
This page explains the generic P0207 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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