# P0300 on the 2012 GMC Canyon

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

Nobody has written a description of this code yet.

## Bulletins for this model year that name P0300

- [10242298](https://open.wenmarpro.com/bulletins/10242298), 2023-09-18: 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
- [10236164](https://open.wenmarpro.com/bulletins/10236164), 2023-05-15: 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
- [10232811](https://open.wenmarpro.com/bulletins/10232811), 2023-03-13: 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
- [10206726](https://open.wenmarpro.com/bulletins/10206726), 2022-01-24: 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
- [10182545](https://open.wenmarpro.com/bulletins/10182545), 2020-11-16: 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
- [10176326](https://open.wenmarpro.com/bulletins/10176326), 2020-06-15: 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
- [10154614](https://open.wenmarpro.com/bulletins/10154614), 2019-03-18: This Preliminary Information communication provides information to the technician about vehicles the have a Service Engine Soon Malfunction Indicator Lamp on and or engine running rough. Technician may find Diagnostic Trouble Codes P0106, P0107, P0171, P0300, P0502, P1107, and P2431. Technician will need to inspect all Manifold Absolute Pressure sensor circuits for being broken inside of the insulation near the Manifold Absolute Pressure sensor connector.
- [10154299](https://open.wenmarpro.com/bulletins/10154299), 2019-03-11: 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
- [10114547](https://open.wenmarpro.com/bulletins/10114547), 2017-08-15: This Preliminary Information communication provides information to the technician with information regarding high misfire rates always on \#1 cylinder. A customer may complain of misfires or roughness on cold start up with a P0300 diagnostic trouble code. Technician is to add coolant dye to the system and run the engine through warm up to circulate the dye. Pressurize the cooling system after a cold soak and inspect the cylinder with a bore scope for coolant dye. Dye is used to identify coolant over residual fuel being that might be left in the cylinder. The technician is not to replace the cylinder head as it will not correct this concern. In some cases it is necessary to remove the head for inspection. Do not replace the engine for small surface pock marks or a pitting appearance this is normal and do not connect to coolant passages. Usually if porosity is present there will be a break in the carbon ring. Only replace the engine if true porosity is found. Technician is to call Product Quality Center with the latest version of bulletin 02\-07\-30\-029 if porosity is found and engine replacement is required.
- [10114479](https://open.wenmarpro.com/bulletins/10114479), 2017-08-15: This Preliminary Information communication provides information to the technician the steps to diagnose and repair vehicles with a Service Engine Soon Malfunction Indicator Lamp on. Technician may find a Diagnostic Trouble Code P0300. After performing all published Service Information diagnostics and a solution has not been made technician should perform the "Cylinder Leakage Test" procedure in SI and document all leakage rates on the repair order. If a leaking intake valve is found, replace the cylinder head and valves by following the latest versions of 07\-06\-01\-018 \(Regular Production Option Code LL8 4.2L\), 06\-06\-01\-017 \(Regular Production Option Codes L52, LK5\) and 07\-06\-01\-019 \(Regular Production Option Codes LLR, LLV\). Before replacing the cylinder head, review the latest version of PIP3940.