P0207 on GMC
Injector Circuit/Open - Cylinder 7
P0207 on GMC vehicles indicates injector circuit/open - cylinder 7. Au7o has documented this code across 1 GMC model — most commonly on Sierra 3500HD. This code indicates the engine computer found an electrical fault — an open or out-of-range circuit — in the fuel injector wiring for cylinder 7. The injector is a solenoid-operated valve, and the computer watches its circuit to verify it's firing on command. A break, short, or high resistance on cylinder 7's injector circuit triggers this code, often with a noticeable misfire or rough idle on that cylinder. The problem lies in the injector itself or its electrical connection, not in fuel pressure or quality. Typical repair costs on GMC range from $600 to $5,000, depending on the specific model and root cause.
Common Causes of P0207
- •Corroded, loose, or damaged injector connector at cylinder 7
- •Open, shorted, or chafed wiring in the injector circuit
- •Failed fuel injector (open internal winding)
- •Poor ground or power feed to the injector driver
- •Failed injector driver circuit inside the ECM/PCM
- •Water intrusion or pin corrosion in the engine harness
P0207 on GMC by Model
GMC Sierra 3500HD(1 issue)
- Diesel Injector Failure Causing White Smoke and Rough Running2015-2024
The Bosch piezoelectric fuel injectors on the Duramax L5P and LML engines can fail due to contaminated fuel, high-mileage wear, or internal electrical faults. A failed injector causes white smoke on startup, rough idle, misfires on the affected cylinder, and fuel dilution of the engine oil. The high fuel rail pressures (up to 36,000 PSI on the L5P) stress the injectors over time. Contaminated fuel from bulk diesel stations accelerates injector wear.
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View P0207 across all makes →Frequently Asked Questions
What does P0207 mean on GMC?▼
P0207 stands for "Injector Circuit/Open - Cylinder 7." This code indicates the engine computer found an electrical fault — an open or out-of-range circuit — in the fuel injector wiring for cylinder 7. The injector is a solenoid-operated valve, and the computer watches its circuit to verify it's firing on command. A break, short, or high resistance on cylinder 7's injector circuit triggers this code, often with a noticeable misfire or rough idle on that cylinder. The problem lies in the injector itself or its electrical connection, not in fuel pressure or quality. On GMC specifically, this code is documented across 1 model.
What causes P0207 on GMC vehicles?▼
Common causes on GMC: Corroded, loose, or damaged injector connector at cylinder 7, Open, shorted, or chafed wiring in the injector circuit, Failed fuel injector (open internal winding), Poor ground or power feed to the injector driver, Failed injector driver circuit inside the ECM/PCM. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0207 on a GMC?▼
Repair costs on GMC range from $600 to $5,000, depending on the specific model and root cause.
Which GMC models have P0207 documented?▼
Au7o has documented P0207 on 1 GMC model: Sierra 3500HD.