# P0300 on the 2018 Honda Civic

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

- [11037695](https://open.wenmarpro.com/bulletins/11037695), 2026-10-01: Service Bulletin \- Under certain conditions, the cylinder head gasket effectiveness may be reduced which may cause vehicles to experience overheating, coolant loss, and/or misfire. In some cases, DTCs P0300 through P0304 may also be stored \(DTCs are not required for repair\).
- [11037693](https://open.wenmarpro.com/bulletins/11037693), 2026-10-01: Service Bulletin \- Under certain conditions, the cylinder head gasket effectiveness may be reduced which may cause vehicles to experience overheating, coolant loss, and/or misfire. In some cases, DTCs P0300 through P0304 may also be stored \(DTCs are not required for repair\).
- [11036424](https://open.wenmarpro.com/bulletins/11036424), 2026-08-27: Dealer Message \- Under certain conditions, the cylinder head gasket effectiveness may be reduced which may cause vehicles to experience overheating, coolant loss, misfire, and/or DTCs P0300 through P0304 stored.
- [11036408](https://open.wenmarpro.com/bulletins/11036408), 2026-08-27: Service Bulletin \- Under certain conditions, the cylinder head gasket effectiveness may be reduced which may cause vehicles to experience overheating, coolant loss, misfire and/or DTCs P0300 thru P0304 stored.
- [11036407](https://open.wenmarpro.com/bulletins/11036407), 2026-08-27: Service Bulletin \- Under certain conditions, the cylinder head gasket effectiveness may be reduced which may cause vehicles to experience overheating, coolant loss, misfire and/or DTCs P0300 thru P0304 stored.
- [10230496](https://open.wenmarpro.com/bulletins/10230496), 2023-01-20: Service Bulletin \- Under certain circumstances, the vehicle may experience driveability issues, which may result in DTCs P0300 \(random misfire detected\), P0301 \(No. 1 cylinder misfire detected\), P0302 \(No. 2 cylinder misfire detected\), P0303 \(No. 3 cylinder misfire detected\), P0304 \(No. 4 cylinder misfire detected\), or P0172 \(fuel system too rich\) or a whirling noise coming from the engine compartment.
- [10230495](https://open.wenmarpro.com/bulletins/10230495), 2023-01-20: Service Bulletin \- This bulletin is replaced by S/B 19\-033, Warranty Extension: 2016\-18 Civic 1.5L: Software Update with A/C Control Unit Replacement; DTC P0300, P0301, P0302, P0303, P0304, or P0172; Whirling Noise from Engine.
- [10165769](https://open.wenmarpro.com/bulletins/10165769), 2019-10-09: Service Bulletin \- Under certain circumstances, the vehicle may experience driveability issues, which may result in DTCs P0300 \(random misfire detected\), P0301 \(No. 1 cylinder misfire detected\), P0302 \(No. 2 cylinder misfire detected\), P0303 \(No. 3 cylinder misfire detected\), P0304 \(No. 4 cylinder misfire detected\), or P0172 \(fuel system too rich\) or a whirling noise coming from the engine compartment.
- [10163173](https://open.wenmarpro.com/bulletins/10163173), 2019-07-23: Owner Notification Letter \- Some 2016\-18 Civic vehicles equipped with the 1.5 liter turbocharged engine may experience driveability issues. This may result in Diagnostic Trouble Codes \(DTCs\) P0300 \(random misfire detected\), P0301 \(No. 1 cylinder misfire detected\), P0302 \(No. 2 cylinder misfire detected\), P0303 \(No. 3 cylinder misfire detected\), P0304 \(No. 4 cylinder misfire detected\), or P0172 \(fuel system too rich\) or a whirling noise coming from the engine compartment. These concerns may result in the Malfunction Indicator Lamp \(MIL\) turning on.
- [10163172](https://open.wenmarpro.com/bulletins/10163172), 2019-07-23: Owner Notification Letter \- Some 2016\-18 Civic vehicles equipped with the 1.5 liter turbocharged engine may experience driveability issues. This may result in Diagnostic Trouble Codes \(DTCs\) P0300 \(random misfire detected\), P0301 \(No. 1 cylinder misfire detected\), P0302 \(No. 2 cylinder misfire detected\), P0303 \(No. 3 cylinder misfire detected\), P0304 \(No. 4 cylinder misfire detected\), or P0172 \(fuel system too rich\) or a whirling noise coming from the engine compartment. These concerns may result in the Malfunction Indicator Lamp \(MIL\) turning on.