P0205 on GMC
Injector Circuit/Open - Cylinder 5
P0205 on GMC vehicles indicates injector circuit/open - cylinder 5. Au7o has documented this code across 1 GMC model — most commonly on Sierra 3500HD. P0205 is a fuel-system code meaning the engine computer detected an electrical problem (an open circuit or out-of-range condition) in the fuel injector circuit for cylinder number 5. The PCM controls each injector with a precise electrical pulse, and it monitors that circuit for proper current flow. When the cylinder 5 injector circuit doesn't respond as expected — typically an open or a wiring fault — this code sets. It generally causes a misfire on that cylinder, rough idle, hesitation, reduced power, and possibly hard starting, since cylinder 5 isn't being fueled correctly. Typical repair costs on GMC range from $600 to $5,000, depending on the specific model and root cause.
Common Causes of P0205
- •Failed or open fuel injector on cylinder 5
- •Open or shorted wiring in the injector control circuit
- •Corroded, loose, or damaged injector connector
- •Poor power feed or driver fault from the PCM/injector circuit
- •Chafed or broken injector harness
- •Blown fuse feeding the injector bank (where applicable)
- •PCM injector driver failure (less common)
P0205 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.
Looking for P0205 on a different make?
View P0205 across all makes →Frequently Asked Questions
What does P0205 mean on GMC?▼
P0205 stands for "Injector Circuit/Open - Cylinder 5." P0205 is a fuel-system code meaning the engine computer detected an electrical problem (an open circuit or out-of-range condition) in the fuel injector circuit for cylinder number 5. The PCM controls each injector with a precise electrical pulse, and it monitors that circuit for proper current flow. When the cylinder 5 injector circuit doesn't respond as expected — typically an open or a wiring fault — this code sets. It generally causes a misfire on that cylinder, rough idle, hesitation, reduced power, and possibly hard starting, since cylinder 5 isn't being fueled correctly. On GMC specifically, this code is documented across 1 model.
What causes P0205 on GMC vehicles?▼
Common causes on GMC: Failed or open fuel injector on cylinder 5, Open or shorted wiring in the injector control circuit, Corroded, loose, or damaged injector connector, Poor power feed or driver fault from the PCM/injector circuit, Chafed or broken injector harness. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0205 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 P0205 documented?▼
Au7o has documented P0205 on 1 GMC model: Sierra 3500HD.