Short answer
What does P0171 tell you?
Fuel-trim system lean on Bank 1. P0171 is a monitor result and does not, by itself, identify the condition that caused it or a part that should be replaced.
A diagnostic trouble code is a recorded monitor result, not a parts diagnosis. The same code can arise in different vehicle contexts; the exact year, make, model, engine, emissions calibration, other codes, and stated symptoms may change which manufacturer information is relevant.
Selected applications
What the OEM sources actually cover
22-NA-171 · P0171/P0174 Colorado and Canyon Bulletin
Published scope: 2017–2022 Chevrolet Colorado and GMC Canyon equipped with the 3.6L LGZ engine, subject to the bulletin's vehicle and condition details.
GM lists P0171 and/or P0174 for this limited application. Its bulletin is evidence about one specific vehicle context, not a universal cause or repair recommendation for P0171.
- 2017–2022 Chevrolet Colorado · LGZ, 3.6L LGZThe bulletin lists the 3.6L LGZ engine and additional vehicle-condition details; verify them in the source.
- 2017–2022 GMC Canyon · LGZ, 3.6L LGZThe bulletin lists the 3.6L LGZ engine and additional vehicle-condition details; verify them in the source.
Limits of this lookup
A scope overlap is not a fitment verdict
The site’s preliminary vehicle matcher compares entered make, model, year, and (where structured) engine text with a small, manually transcribed list of source applications. It cannot validate a VIN, production breakpoint, emissions certification, ECM calibration, complete engine configuration, or whether a bulletin remains current.
A “possible bulletin scope match” means only that the fields entered overlap a listed source scope. A mismatch is not proof that no source applies, because this reference is incomplete. Confirm the full source conditions with the manufacturer or a qualified technician.
A conservative next step
Keep the vehicle context with the code
Record the exact code, model year, make, model, engine, other stored codes, and the circumstances described in the owner’s manual. Compare those details with the linked manufacturer source before treating a bulletin as relevant. Do not share a VIN in this lookup.
If warning lights or symptoms are severe, follow the vehicle owner’s manual and seek qualified service rather than relying on an online code explanation.
Source method: source documents and their stated scopes were checked on September 28, 2026. This date records a source review; it does not mean every model configuration was independently tested or that a bulletin has not since been superseded.