Honda Accord 2023–2026 — technical service bulletin
Bulletin A26-005 · NHTSA communication 11036404 · issued Aug 26, 2026
Technical service bulletin
communication type
Engine
component
2023–2026
model years
4
vehicle entries
Official summary
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.
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.