P0206 on GMC
Injector Circuit/Open - Cylinder 6
P0206 on GMC vehicles indicates injector circuit/open - cylinder 6. Au7o has documented this code across 1 GMC model — most commonly on Sierra 3500HD. This code means the engine computer detected an electrical problem in the fuel injector circuit for cylinder 6 — specifically an open circuit or one that's out of its expected resistance range. Each injector is an electrically controlled valve that sprays fuel into the cylinder, and the computer monitors that circuit to make sure the injector is responding to its commands. When it sees a break, short, or weak signal on cylinder 6's injector wiring, it sets this code, which usually shows up alongside a rough-running engine or a misfire on that cylinder. It points to a wiring/connector fault or a bad injector rather than a fuel-quality problem. Typical repair costs on GMC range from $600 to $5,000, depending on the specific model and root cause.
Common Causes of P0206
- •Corroded, loose, or damaged injector connector at cylinder 6
- •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
P0206 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 P0206 across all makes →Frequently Asked Questions
What does P0206 mean on GMC?▼
P0206 stands for "Injector Circuit/Open - Cylinder 6." This code means the engine computer detected an electrical problem in the fuel injector circuit for cylinder 6 — specifically an open circuit or one that's out of its expected resistance range. Each injector is an electrically controlled valve that sprays fuel into the cylinder, and the computer monitors that circuit to make sure the injector is responding to its commands. When it sees a break, short, or weak signal on cylinder 6's injector wiring, it sets this code, which usually shows up alongside a rough-running engine or a misfire on that cylinder. It points to a wiring/connector fault or a bad injector rather than a fuel-quality problem. On GMC specifically, this code is documented across 1 model.
What causes P0206 on GMC vehicles?▼
Common causes on GMC: Corroded, loose, or damaged injector connector at cylinder 6, 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 P0206 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 P0206 documented?▼
Au7o has documented P0206 on 1 GMC model: Sierra 3500HD.