C056E on GMC vehicles
C056E is named on 14 GMC model years (2017–2022): 51 manufacturer filings and 0 owner reports in NHTSA’s files, across Acadia, Sierra, Sierra 2500HD, Sierra 3500HD.
Which GMC model years name C056E
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2019 GMC Acadia | Parking Brake | 8 | — |
| 2018 GMC Acadia | Parking Brake | 8 | — |
| 2017 GMC Acadia | Parking Brake | 8 | — |
| 2019 GMC Sierra | Parking Brake | 7 | — |
| 2022 GMC Acadia | Electrical System | 3 | — |
| 2022 GMC Sierra | Electrical System | 3 | — |
| 2021 GMC Acadia | Parking Brake | 3 | — |
| 2021 GMC Sierra | Electrical System | 3 | — |
| 2020 GMC Acadia | Electrical System | 3 | — |
| 2022 GMC Sierra 2500HD | Parking Brake | 1 | — |
| 2022 GMC Sierra 3500HD | Electrical System | 1 | — |
| 2021 GMC Sierra 2500HD | Parking Brake | 1 | — |
| 2021 GMC Sierra 3500HD | Electrical System | 1 | — |
| 2019 GMC Sierra 3500HD | Parking Brake | 1 | — |
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.
GMC filings that name C056E
Source: NHTSA manufacturer communicationsBulletins and campaigns GMC filed with NHTSA whose summary names C056E. Quote the document number at the service desk — it is a diagnosis the maker has already written down.
- PIT5662A Service bulletin2019-04-25 · Electrical System
- This Preliminary information communicates information to diagnose DTC C056D or C056E.
- PIT5662B Service bulletin2019-05-03 · Parking Brake
- This Preliminary information communicates information to diagnose DTC C056D or C056E.
- PIT5662C Service bulletin2019-07-19 · Equipment
- This Preliminary information communicates information to diagnose DTC C056D or C056E.
- PIT5662D Service bulletin2020-01-09 · Parking Brake
- This Preliminary information communicates information to diagnose DTC C056D or C056E.
- PIT5662F Service bulletin2021-08-19 · Electrical System — Adas — Parking Assist — Warning
- This Preliminary information communicates information to diagnose DTC C056D or C056E.
- PIT5662G Service bulletin2022-03-25 · Parking Brake
- This Preliminary information communicates information to diagnose DTC C056D or C056E.
- PIT5662G Service bulletin2022-11-18 · Equipment — Other — Owners/Service/Other Manual
- This Preliminary information communicates information to diagnose DTC C056D or C056E.
What C056E means
Source: SAE J2012 / OBD-IIC056E 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 C056E a known problem on GMC vehicles?
It is a documented one: NHTSA's files hold 51 manufacturer filings and 0 owner reports naming C056E on 14 GMC model years (2017–2022). 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 C056E appear on most?
2019 Acadia (8 documents), 2018 Acadia (8 documents), 2017 Acadia (8 documents).
Does C056E 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.