# Service bulletin A26\-012

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: 11037698
- Published by NHTSA: 2026\-10\-01
- Manufacturer's number: A26\-012
- Manufacturer's date: 2026\-09\-25
- NHTSA component: ENGINE

## NHTSA's summary

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 \(DTCs are not required for repair\).

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11037698-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11037698-9999.pdf)

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

## Components

Engine

## Trouble codes named

P0300, P0304

## Vehicles listed

- 2025 to 2026 HONDA CIVIC

## Other bulletins for the same vehicles and component

- [A26\-013](/bulletins/11037701.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\-013](/bulletins/11036412.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\-012](/bulletins/11036411.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.
- [ATI\&08202026903](/bulletins/11036325.md), 2026-08-24, Other: ENGINE. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2025\-2026 Civic 2.0Ls with a customer complaint of engine stalling or loss of power. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle before you attempt a repair of any kind.
- [ATI\&08052026902](/bulletins/11036110.md), 2026-08-12, Other: ENGINE. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2025\-2026 Civic 2.0Ls with a customer complaint of engine stalling or loss of power. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle before you attempt a repair of any kind.
- [A26\-089](/bulletins/11035784.md), 2026-08-05, Service bulletin: FUEL/PROPULSION SYSTEM; ENGINE. Service Bulletin \- To better manage engine temperatures, a PGM\-FI update has been developed to optimize electric water pump operation.
- [ATI\&07212026903](/bulletins/11035779.md), 2026-08-05, Other: ENGINE. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2025\-2026 Civic 2.0Ls with a customer complaint of engine stalling or loss of power. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle before you attempt a repair of any kind.
- [AEBM07242026902](/bulletins/11035778.md), 2026-08-05, Other: ENGINE; FUEL/PROPULSION SYSTEM. Dealer Message \- To help improve engine temperatures, a software update has been developed for the electric water pump to optimize its operation.
- [ATI\&07062026901](/bulletins/11035207.md), 2026-07-23, Other: ENGINE. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2025\-2026 Civic 2.0Ls with a customer complaint of engine stalling or loss of power. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle before you attempt a repair of any kind.

JSON: [/v1/bulletins/11037698](/v1/bulletins/11037698)

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