P0207 Code — Injector Circuit/Open - Cylinder 7

Quick answer

• What it means: The engine computer (PCM) has detected an open circuit or electrical malfunction in the fuel injector circuit for Cylinder 7.
• Severity: High. You should not ignore this code, as driving with a disabled cylinder can cause further damage to the engine or exhaust system.
• Most common cause: A failed fuel injector (specifically an internally open coil) on cylinder number 7, or a damaged wiring harness leading to that injector.

What the P0207 code means

The official OBD-II definition for P0207 is "Injector Circuit/Open - Cylinder 7."

In plain English, this means your vehicle's Powertrain Control Module (PCM) is trying to control the fuel injector for the seventh cylinder, but it isn't seeing the expected electrical voltage or resistance in return. Fuel injectors are essentially electrically operated solenoids. The PCM supplies them with a constant voltage and pulses the ground circuit to open the injector valve, spraying atomized fuel into the engine.

When the PCM detects an "open" circuit, it means there is a break in this electrical path. The electricity cannot complete its circuit. As a result, the fuel injector on cylinder 7 will not fire, leaving that cylinder completely starved of fuel.

Common symptoms

When cylinder 7 loses its fuel supply, you will immediately notice drivability issues. Common symptoms include:

• Check Engine Light: Will illuminate, and may flash if the resulting misfire is severe enough to threaten the catalytic converter.
• Rough idle and engine vibration: A dead cylinder creates a severe imbalance in the engine's rotational mass.
• Loss of engine power: Noticeable sluggishness when accelerating.
• Engine stalling or hesitation: Especially when coming to a stop or trying to take off.
• Poor fuel economy: The engine works harder to compensate for the dead cylinder.

Common causes

Ranked from most to least likely, the causes of a P0207 code are:

1. Internal failure of the Cylinder 7 fuel injector: The electromagnetic coil inside the injector frequently burns out or breaks, causing an open circuit.
2. Damaged wiring or connector: Rodent damage, chafed wires, or a loose/corroded connector at the fuel injector are incredibly common.
3. Open ground or power circuit: A break in the main wiring harness leading back to the PCM.
4. Faulty Powertrain Control Module (PCM): Rare, but the internal driver inside the computer that grounds the injector can occasionally fail.

How a technician diagnoses it

An ASE-certified technician will follow a logical electrical diagnostic path to isolate the exact point of failure:

1. Scan Tool and Freeze Frame Data: The technician will hook up a professional-grade scan tool to verify the P0207 code and check for any accompanying misfire codes (like P0307).
2. Visual Inspection: They will inspect the wiring harness and the connector at the cylinder 7 fuel injector. They are looking for broken wires, melted plastic, or pushed-out connector pins.
3. Noid Light Test: The tech will unplug the injector and plug a "noid light" into the wiring harness connector. As the engine is cranked, the noid light should flash rhythmically.
   • Good result: The light flashes, proving the PCM and wiring are successfully delivering the signal. The fuel injector itself is the culprit.
   • Bad result: The light stays off, meaning the problem is in the wiring harness or the PCM.
4. Resistance (Ohms) Testing: If the noid light flashed, the tech will use a digital multimeter to measure the resistance across the two pins on the fuel injector. Most standard injectors should read between 11 and 18 ohms. An "OL" (Out of Limits / Open Line) reading confirms the injector coil has failed internally.
5. Circuit Testing: If the noid light did not flash, the tech will test the harness for constant 12-volt power (with the key on) and check the ground wire for continuity all the way back to the PCM pin to find the broken wire.

Typical repair cost

Repair costs for a P0207 code vary based on the vehicle's make and model, primarily because accessing the fuel injectors can be labor-intensive (especially on V8 engines where the intake manifold might need to be removed).

• Fuel Injector Replacement: $200 to $500. The injector itself typically costs $50 to $150, with labor making up the rest ($150–$350).
• Wiring Repair: $100 to $250. If the connector is simply chewed by mice or the wires are chafed, splicing in a new pigtail connector is a relatively fast and inexpensive fix.
• PCM Replacement (Rare): $600 to $1,500. This is the worst-case scenario requiring a new computer and dealer-level programming.

Can I keep driving with this code?

No, it is highly recommended that you stop driving the vehicle.

Driving with a P0207 code means you have a 100% dead cylinder. While the engine might still run on the remaining cylinders, the severe imbalance can cause damage to internal engine components and motor mounts. Furthermore, if the code is intermittent and the injector occasionally dumps raw fuel, it can melt the honeycomb structure inside your catalytic converter, turning a $300 fix into a $2,000 nightmare. Have the vehicle towed or limp it straight to a shop if you are very close.

Related codes

If you have a P0207, you might also see these related diagnostic trouble codes:

• P0307: Cylinder 7 Misfire Detected (Directly caused by the lack of fuel).
• P0201 through P0208: Injector Circuit/Open codes for the other cylinders (Cylinders 1 through 8). If multiple codes are present, suspect a shared power feed issue.
• P0269: Cylinder 7 Contribution/Balance (The PCM realizes cylinder 7 is not contributing to engine power).
• P0171 / P0174: System Too Lean (The oxygen sensors may read lean because cylinder 7 isn't receiving fuel, throwing off bank-to-bank fuel trim).

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