P0208 on GMC
Injector Circuit/Open - Cylinder 8
P0208 on GMC vehicles indicates injector circuit/open - cylinder 8. Au7o has documented this code across 1 GMC model — most commonly on Sierra 3500HD. This code means the engine computer detected an open or out-of-range condition in the fuel injector circuit for cylinder 8. Fuel injectors are electrically operated valves, and the computer continuously checks that each one's circuit responds correctly when commanded to open. When cylinder 8's injector circuit reads as broken, shorted, or electrically abnormal, this code sets — frequently accompanied by a misfire or rough running on that cylinder. The fault is electrical (wiring, connector, or the injector itself), not a fuel-supply issue. Typical repair costs on GMC range from $600 to $5,000, depending on the specific model and root cause.
Common Causes of P0208
- •Corroded, loose, or damaged injector connector at cylinder 8
- •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
P0208 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 P0208 across all makes →Frequently Asked Questions
What does P0208 mean on GMC?▼
P0208 stands for "Injector Circuit/Open - Cylinder 8." This code means the engine computer detected an open or out-of-range condition in the fuel injector circuit for cylinder 8. Fuel injectors are electrically operated valves, and the computer continuously checks that each one's circuit responds correctly when commanded to open. When cylinder 8's injector circuit reads as broken, shorted, or electrically abnormal, this code sets — frequently accompanied by a misfire or rough running on that cylinder. The fault is electrical (wiring, connector, or the injector itself), not a fuel-supply issue. On GMC specifically, this code is documented across 1 model.
What causes P0208 on GMC vehicles?▼
Common causes on GMC: Corroded, loose, or damaged injector connector at cylinder 8, 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 P0208 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 P0208 documented?▼
Au7o has documented P0208 on 1 GMC model: Sierra 3500HD.