# Service bulletin A23\-026

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10233208
- Published by NHTSA: 2023\-03\-23
- Manufacturer's number: A23\-026
- Manufacturer's date: 2023\-03\-14
- NHTSA component: ENGINE AND ENGINE COOLING

## NHTSA's summary

Service Bulletin \- Under certain circumstances, the vehicle may experience driveability concerns. This may result in the following DTC’s to set: • P0300 \(Random Misfire Detected\), • P0301 \(No. 1 Cylinder Misfire Detected\), • P0302 \(No. 2 Cylinder Misfire Detected\), • P0303 \(No. 3 Cylinder Misfire Detected\), • P0304 \(No. 4 Cylinder Misfire Detected\), • P0172 \(Fuel System Too Rich\)

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2023/MC-10233208-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2023/MC-10233208-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine

## Trouble codes named

P0172, P0300, P0301, P0302, P0303, P0304

## Vehicles listed

- 2018 to 2022 HONDA ACCORD

## Other bulletins for the same vehicles and component

- [A26\-006](/bulletins/11037690.md), 2026-10-01, Service bulletin: ENGINE. 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 \(DTCs are not required for repair\).
- [A26\-004](/bulletins/11037688.md), 2026-10-01, Service bulletin: ENGINE. 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 \(DTCs are not required for repair\).
- [A26\-003](/bulletins/11037687.md), 2026-10-01, Service bulletin: ENGINE. 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 \(DTCs are not required for repair\).
- [AEBM08262026901](/bulletins/11036424.md), 2026-08-27, Other: ENGINE. 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.
- [A26\-006](/bulletins/11036405.md), 2026-08-27, Service bulletin: ENGINE. 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.
- [A26\-004](/bulletins/11036403.md), 2026-08-27, Service bulletin: ENGINE. 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.
- [A26\-003](/bulletins/11036336.md), 2026-08-24, Service bulletin: ENGINE. 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.
- [A25\-074](/bulletins/11021744.md), 2025-08-08, Service bulletin: ENGINE. Service Bulletin \- Oil leak at timing chain tensioner inspection cover due to possible insufficient sealant adhesion on inspection cover.
- [ATI\&12022024909](/bulletins/11011792.md), 2024-12-12, Other: ENGINE. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2018\-2024 Accord 1.5Ls, 2021\-2024 Civics 1.5Ls, 2023\-2024 CR\-Vs 1.5Ls, and 2017 Fits with customer complaint of Check Engine Light \(CEL\) on with DTC P0420 \[Catalyst System Efficiency Below Threshold\] stored. To better understand the cause of this condition, AHM would like to specific parts from the vehicle prior to you attempting a repair of any kind.
- [ATI\&12052024903](/bulletins/11011786.md), 2024-12-12, Other: ENGINE. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2018\-2022 Accord FHEVs with a customer complaint of the Malfunction Indicator Light \(MIL\) on with the DTC P030X \(Cylinder Misfire Detected\) stored. Customer may also experience engine running rough condition. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to you attempting a repair of any kind.

JSON: [/v1/bulletins/10233208](/v1/bulletins/10233208)

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