P0308 on GMC vehicles Cylinder 8 is misfiring
P0308 is named on 56 GMC model years (2016–2022): 294 manufacturer filings and 3 owner reports in NHTSA’s files, across Yukon, Sierra, Acadia, Canyon, Savana and 3 more.
Which GMC model years name P0308
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2018 GMC Yukon | Engine | 11 | — |
| 2017 GMC Yukon | Engine | 11 | — |
| 2016 GMC Yukon | Engine | 11 | — |
| 2018 GMC Sierra | Engine | 9 | 1 |
| 2017 GMC Sierra | Engine | 8 | — |
| 2016 GMC Sierra | Engine | 8 | — |
| 2021 GMC Sierra | Engine | 7 | — |
| 2021 GMC Yukon | Engine | 7 | — |
| 2018 GMC Acadia | Engine | 7 | — |
| 2018 GMC Canyon | Engine | 7 | — |
| 2018 GMC Savana | Engine | 7 | — |
| 2018 GMC Terrain | Engine | 7 | — |
| 2017 GMC Acadia | Engine | 7 | — |
| 2017 GMC Canyon | Engine | 7 | — |
| 2017 GMC Savana | Engine | 7 | — |
| 2017 GMC Terrain | Engine | 7 | — |
| 2016 GMC Acadia | Engine | 7 | — |
| 2016 GMC Canyon | Engine | 7 | — |
| 2016 GMC Savana | Engine | 7 | — |
| 2016 GMC Sierra 2500HD | Engine | 7 | — |
| 2016 GMC Terrain | Engine | 7 | — |
| 2020 GMC Sierra | Engine | 6 | — |
| 2019 GMC Sierra | Engine | 5 | 1 |
| 2019 GMC Yukon | Engine | 6 | — |
| 2020 GMC Yukon | Engine | 4 | 1 |
| 2018 GMC Sierra 2500HD | Engine | 5 | — |
| 2017 GMC Sierra 2500HD | Engine | 5 | — |
| 2022 GMC Acadia | Engine | 4 | — |
| 2022 GMC Canyon | Engine | 4 | — |
| 2022 GMC Savana | Engine | 4 | — |
| 2022 GMC Sierra | Engine | 4 | — |
| 2022 GMC Terrain | Engine | 4 | — |
| 2022 GMC Yukon | Engine | 4 | — |
| 2021 GMC Acadia | Engine | 4 | — |
| 2021 GMC Canyon | Engine | 4 | — |
| 2021 GMC Savana | Engine | 4 | — |
| 2021 GMC Terrain | Engine | 4 | — |
| 2020 GMC Acadia | Engine | 4 | — |
| 2020 GMC Canyon | Engine | 4 | — |
| 2020 GMC Savana | Engine | 4 | — |
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.
The vehicle is currently experiencing a cylinder 8 misfire (code P0308), accompanied by engine backfiring, ticking noise, and exhaust fumes inside the cabin
GMC filings that name P0308
Source: NHTSA manufacturer communicationsBulletins and campaigns GMC filed with NHTSA whose summary names P0308. Quote the document number at the service desk — it is a diagnosis the maker has already written down.
- PIP5628 Service bulletin2019-02-18 · Engine And Engine Cooling
- This Preliminary information communicates information that will need to be provided to TAC to aid in diagnosing if a vehicle comes in with misfire and DTC Codes P0300 - P0308 and/or P050D
- PIP5628B Service bulletin2020-05-21 · Engine
- This Preliminary information communicates information that will need to be provided to TAC to aid in diagnosing if a vehicle comes in with misfire and DTC Codes P0300 - P0308 and/or P050D
- PIP5628C Service bulletin2020-10-08 · Engine And Engine Cooling
- This Preliminary information communicates information that will need to be provided to TAC to aid in diagnosing if a vehicle comes in with misfire and DTC Codes P0300 - P0308 and/or P050D
- PIP5159C Service bulletin2018-10-29 · Engine
- This Preliminary Information communication provides information to the technician about vehicles that may have a Service Engine Soon Malfunction Indicator Lamp on and Diagnostic Trouble Code P0300 - P0308 may set. Technician will inspect for lose sparkplug wire. If a spark plug wire is found lose check for a missing ?C? clip on the wire end for the ignition coil. If the clip is missing replace th
- PIP5628E Service bulletin2021-12-14 · Engine And Engine Cooling
- This Preliminary information communicates information that will need to be provided to TAC to aid in diagnosing if a vehicle comes in with misfire and DTC Codes P0300 - P0308 and/or P050D
- PIP5628E Service bulletin2023-02-10 · Equipment — Electrical — Accessory Generator — Outlets/Receptacle
- This Preliminary information communicates information that will need to be provided to TAC to aid in diagnosing if a vehicle comes in with misfire and DTC Codes P0300 - P0308 and/or P050D
- 23-NA-043 Service bulletin2023-04-19 · Engine And Engine Cooling
- This service bulletin provides a procedure to replace the valve lifter and guides to correct customer concerns of Poor Engine Performance, Engine Misfires, Malfunction Indicator Lamp (MIL) Illuminated - DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308 Set.
- PIP5628F Service bulletin2023-04-24 · Engine And Engine Cooling — Engine — Engine Control Module (Ecu/Ecm)
- This Preliminary information communicates information that will need to be provided to TAC to aid in diagnosing if a vehicle comes in with misfire and DTC Codes P0300 - P0308 and/or P050D
What P0308 means
Source: SAE J2012 / OBD-IICylinder 8 is misfiring.
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 P0308 a known problem on GMC vehicles?
It is a documented one: NHTSA's files hold 294 manufacturer filings and 3 owner reports naming P0308 on 56 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 P0308 appear on most?
2018 Yukon (11 documents), 2017 Yukon (11 documents), 2016 Yukon (11 documents).
Does P0308 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.