C05B0 on GMC vehicles
C05B0 is named on 10 GMC model years (2019–2023): 27 manufacturer filings and 1 owner report in NHTSA’s files, across Sierra, Yukon, Acadia, Hummer EV, Terrain.
Which GMC model years name C05B0
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2019 GMC Sierra | Service Brakes | 5 | 1 |
| 2023 GMC Yukon | Service Brakes | 4 | — |
| 2022 GMC Yukon | Service Brakes | 4 | — |
| 2023 GMC Acadia | Service Brakes | 2 | — |
| 2023 GMC Hummer EV | Service Brakes | 2 | — |
| 2023 GMC Sierra | Service Brakes | 2 | — |
| 2023 GMC Terrain | Service Brakes | 2 | — |
| 2022 GMC Acadia | Service Brakes | 2 | — |
| 2021 GMC Acadia | Service Brakes | 2 | — |
| 2020 GMC Acadia | Service Brakes | 2 | — |
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.
What GMC owners said
Source: NHTSA complaint databaseOwners’ own words, scrubbed of anything identifying. Unverified reports filed with NHTSA — what was said, not a finding that it was true.
Alarm codes P25A2 & C05B0 -Brake system failure 43mph top speed -Service trailer brake system -Service brake assist -Service ESC -Check engine light -Traction control light My vehicle is not showing any recall, but obviously I’m not the…
GMC filings that name C05B0
Source: NHTSA manufacturer communicationsBulletins and campaigns GMC filed with NHTSA whose summary names C05B0. Quote the document number at the service desk — it is a diagnosis the maker has already written down.
- PIT5638A Service bulletin2018-12-19 · Service Brakes
- This Preliminary information communicates an issues with a Service Brake Assist Message With DTC C05B0 and/or C058E and that engineering released updated calibrations to correct the issue.
- PIT5638B Service bulletin2019-03-14 · Service Brakes
- This Preliminary information communicates an issues with a Service Brake Assist Message With DTC C05B0 and/or C058E and that engineering released updated calibrations to correct the issue.
- PIT5638C Service bulletin2019-05-15 · Service Brakes
- This Preliminary information communicates an issues with a Service Brake Assist Message With DTC C05B0 and/or C058E and that engineering released updated calibrations to correct the issue.
- 22-NA-247 Service bulletin2022-12-06 · Service Brakes, Hydraulic
- This service bulletin provides information to dealership personnel that after performing a brake inspection, brake pad replacement, or any other repair that requires the caliper piston to be reseated may be causing DTC C05B0 to falsely set for eBoost applications.
- 22-NA-247 Service bulletin2023-04-11 · Electrical System
- This service bulletin provides information to dealership personnel that after performing a brake inspection, brake pad replacement, or any other repair that requires the caliper piston to be reseated may be causing DTC C05B0 to falsely set for eBoost applications.
What C05B0 means
Source: SAE J2012 / OBD-IIC05B0 sits in the generic range of the OBD-II standard, so it means the same thing on every vehicle sold in the United States — but WhichTrim does not carry a definition for it and will not invent one. What is on this page is the record: who named it and on what.
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.
Common questions
Source: NHTSA files and the OBD-II standardIs C05B0 a known problem on GMC vehicles?
It is a documented one: NHTSA's files hold 27 manufacturer filings and 1 owner report naming C05B0 on 10 GMC model years (2019–2023). 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 C05B0 appear on most?
2019 Sierra (6 documents), 2023 Yukon (4 documents), 2022 Yukon (4 documents).
Does C05B0 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.