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Home›Trouble codes›C111B› GMC
Diagnostic trouble code · GMC

C111B on GMC vehicles

C111B is named on 13 GMC model years (2016–2023): 22 manufacturer filings and 0 owner reports in NHTSA’s files, across Sierra 2500HD, Sierra 3500HD.

Chassis 13 model years 22 manufacturer filings

Which GMC model years name C111B

Source: NHTSA manufacturer communications and complaints
Model yearFiled underBulletinsOwner reports
2023 GMC Sierra 2500HDNot specified2—
2023 GMC Sierra 3500HDNot specified2—
2022 GMC Sierra 2500HDNot specified2—
2022 GMC Sierra 3500HDNot specified2—
2021 GMC Sierra 2500HDNot specified2—
2021 GMC Sierra 3500HDNot specified2—
2020 GMC Sierra 2500HDNot specified2—
2020 GMC Sierra 3500HDNot specified2—
2016 GMC Sierra 2500HDElectrical System2—
2018 GMC Sierra 2500HDElectrical System1—
2017 GMC Sierra 2500HDElectrical System1—
2017 GMC Sierra 3500HDElectrical System1—
2016 GMC Sierra 3500HDElectrical 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.

Not specified 16 Electrical System 6
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GMC filings that name C111B

Source: NHTSA manufacturer communications

Bulletins and campaigns GMC filed with NHTSA whose summary names C111B. Quote the document number at the service desk — it is a diagnosis the maker has already written down.

What C111B means

Source: SAE J2012 / OBD-II

C111B is a manufacturer-specific code: the second character is a 1, which under the OBD-II standard hands the definition to whoever built the vehicle. The same code can mean one thing on a Ford and something unrelated on a Hyundai. Any site that prints a single definition for it is guessing.

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 C111B a known problem on GMC vehicles?

It is a documented one: NHTSA's files hold 22 manufacturer filings and 0 owner reports naming C111B on 13 GMC model years (2016–2023). 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 C111B appear on most?

2023 Sierra 2500HD (2 documents), 2022 Sierra 2500HD (2 documents), 2021 Sierra 2500HD (2 documents).

Does C111B 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 P2463 Another code that appears in the same filings and owner reports as C111B.Filed alongside B101D Another code that appears in the same filings and owner reports as C111B.Vehicle 2023 GMC Sierra 2500HD The model year C111B 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.