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DTC codes / P02xx · Fuel and air metering (injector circuits) / P0207

P0207Injector Circuit/Open - Cylinder 7

P0207 is a generic OBD-II code indicating that the engine control module (ECM) has detected an open circuit or abnormal electrical condition in the fuel injector circuit for cylinder 7. The ECM monitors the injector driver circuit and sets this code when the current flow is outside the expected range, typically because the circuit is open or has excessive resistance.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaFuel and air metering (injector circuits)

Symptoms you may notice

  • Check engine light illuminated, often with no other noticeable symptoms
  • Rough idle or misfire, especially noticeable at idle or low speeds
  • Engine hesitation or stumble during acceleration
  • Reduced engine power and poor fuel economy
  • Shaking or vibration from the engine, particularly under load
  • In some cases, the engine may enter limp mode to protect the catalytic converter

Common causes, most likely first

  1. Faulty fuel injector on cylinder 7 (open internal coil or winding)
  2. Damaged or disconnected electrical connector at the cylinder 7 injector
  3. Broken, chafed, or corroded wiring in the injector circuit
  4. Open circuit in the harness between the ECM and the injector
  5. Failed ECM driver for the cylinder 7 injector (rare but possible)
  6. Poor electrical connection at the ECM connector or ground point

How to diagnose and fix it

  1. Perform a visual inspection of the cylinder 7 injector connector and wiring for damage or corrosion
  2. Use a noid light or injector pulse tester to verify that the ECM is sending a command signal to the injector
  3. Measure the resistance of the cylinder 7 injector with a multimeter and compare to the manufacturer's specification
  4. Check for continuity and resistance in the wiring between the ECM and the injector, looking for opens or shorts
  5. Inspect the ECM connector pins for corrosion or poor contact, and clean or repair as needed
  6. If the injector is faulty, replace it and clear the code, then verify the repair with a test drive
  7. If all electrical checks pass, consult the factory service information for further diagnostics, as the ECM may be at fault

Before you replace the cylinder 7 injector

  • A loose or corroded connector at the injector is a common cause of P0207 that is often overlooked, so always check the plug before condemning the injector.
  • The code can be set by a wiring problem anywhere along the circuit, not just at the injector, so a continuity test from the ECM to the injector is essential.
  • On some vehicles, a failed injector on one cylinder can cause a misfire code for that cylinder as well, but P0207 specifically points to an electrical circuit fault rather than a mechanical or fuel delivery issue.
  • A noid light test is a quick way to confirm whether the ECM is pulsing the injector; if the light flashes, the injector itself is likely the problem, but if not, the wiring or ECM driver is suspect.
  • Always disconnect the battery before testing injector circuits to avoid damaging the ECM, and use a high-impedance multimeter to prevent accidental short circuits.

Can I keep driving with P0207?

It is generally safe to drive with P0207 for a short distance to a repair shop, but avoid heavy acceleration or towing, as the misfire can damage the catalytic converter over time. If the engine is running very rough or lacks power, it is best to stop driving and have the vehicle towed.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

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

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