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September 25, 2026 Service bulletin

Under certain conditions, the cylinder head gasket effectiveness may be reduced which may

Honda technical service bulletin A26-012 for 2025-2026 Honda Civic.

Bulletin number
A26-012
Component
Engine
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).

Owners of these vehicles have filed 10 complaints in the engine category.

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