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Home›Trouble codes›P0171› GMC
Diagnostic trouble code · GMC

P0171 on GMC vehicles The engine is running lean on bank 1: too much air, or not enough fuel, for the mixture the computer wants

P0171 is named on 13 GMC model years (2016–2022): 50 manufacturer filings and 1 owner report in NHTSA’s files, across Acadia, Canyon, Terrain.

Powertrain 13 model years 50 manufacturer filings 1 owner report

Which GMC model years name P0171

Source: NHTSA manufacturer communications and complaints
Model yearFiled underBulletinsOwner reports
2017 GMC AcadiaElectrical System10—
2017 GMC CanyonEngine6—
2018 GMC AcadiaFuel/Propulsion System5—
2018 GMC TerrainFuel/Propulsion System41
2017 GMC TerrainFuel/Propulsion System5—
2016 GMC AcadiaFuel/Propulsion System5—
2016 GMC TerrainFuel/Propulsion System5—
2016 GMC CanyonElectrical System3—
2021 GMC CanyonElectrical System2—
2020 GMC CanyonElectrical System2—
2022 GMC CanyonElectrical System1—
2019 GMC CanyonEngine1—
2018 GMC CanyonElectrical System1—

A model year is listed because the code is named in its own record — a bulletin filed against it, or an owner’s complaint about it — not because every one of these vehicles sets it. Counts are documents in NHTSA’s files, not failure rates.

Fuel/Propulsion System 19 Electrical System 18 Engine 7 Equipment 5
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GMC filings that name P0171

Source: NHTSA manufacturer communications

Bulletins and campaigns GMC filed with NHTSA whose summary names P0171. Quote the document number at the service desk — it is a diagnosis the maker has already written down.

What P0171 means

Source: SAE J2012 / OBD-II

The engine is running lean on bank 1: too much air, or not enough fuel, for the mixture the computer wants.

A stored code names the test that failed, never the part that caused it. The record above is what GMC and its owners have filed about it; the code’s page across every make has the whole file.

From here
Get a model's new bulletins by email See what owners reported Look up a bulletin by its number Watch a VIN for new recalls

Common questions

Source: NHTSA files and the OBD-II standard

Is P0171 a known problem on GMC vehicles?

It is a documented one: NHTSA's files hold 50 manufacturer filings and 1 owner report naming P0171 on 13 GMC model years (2016–2022). Whether it is a problem on one particular car is a diagnosis, not a count — but a bulletin that names the code on your model year is the place to start.

Which GMC models does P0171 appear on most?

2017 Acadia (10 documents), 2017 Canyon (6 documents), 2018 Acadia (5 documents).

Does P0171 on a GMC mean it is recalled?

No. Recalls are filed by campaign and matched by VIN; no recall is triggered by a scan tool. Check the VIN at nhtsa.gov/recalls, or open the model year's page here for the campaigns filed against it.

Where to go next

pages beside this code
Filed alongside P0174 Another code that appears in the same filings and owner reports as P0171.Filed alongside P0455 Another code that appears in the same filings and owner reports as P0171.Vehicle 2017 GMC Acadia The model year P0171 is filed against most often.The data Trouble codes by API GET /v1/dtc joins every code to bulletins and owner reports — free tier, no card.