# Service bulletins for the 2021 Honda Civic

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.

79 bulletins from NHTSA, as of 2026-10-19.

- [A26\-009](/bulletins/11037695.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\-008](/bulletins/11037693.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\-009](/bulletins/11036408.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\-008](/bulletins/11036407.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.
- [A25\-076](/bulletins/11021745.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\&11052024902](/bulletins/11010549.md), 2024-11-14, 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 \[Catalyst System Effciency Below Threshold\] 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\&09122024904](/bulletins/11007887.md), 2024-09-18, Other: ELECTRICAL SYSTEM. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2020\-2021 Civics, 2020\-2022 CR\-Vs, 2022\-2023 Pilots \& Passports with a customer complaint of the center display flickering, flashing, or frozen \(Civics and CR\-Vs only\). To better understand the cause of this condition, AHM would like to collect information from the vehicle prior to you attempting a repair of any kind.
- [ATI\&08072024901](/bulletins/11006244.md), 2024-08-13, Other: ELECTRICAL SYSTEM. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2020\-2021 Civics, 2020\-2022 CR\-Vs, 2022\-2023 Pilots \& Passports with a customer complaint of the center display flickering, flashing, or frozen \(Civics and CR\-Vs only\). To better understand the cause of this condition, AHM would like to collect information from the vehicle prior to you attempting a repair of any kind.
- [ATI\&07232024904](/bulletins/11005269.md), 2024-07-26, Other: ELECTRICAL SYSTEM. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2020\-2021 Civics, 2020\-2022 CR\-Vs, 2022\-2023 Pilots \& Passports with a customer complaint of the center display flickering, flashing, or frozen \(Civics and CR\-Vs only\). To better understand the cause of this condition, AHM would like to collect information from the vehicle prior to you attempting a repair of any kind.
- [ATI\&07082024906](/bulletins/11004269.md), 2024-07-11, Other: ELECTRICAL SYSTEM. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2020\-2021 Civics, 2020\-2022 CR\-Vs, 2022\-2023 Pilots \& Passports with a customer complaint of the center display flickering, flashing, or frozen \(Civics and CR\-Vs only\). To better understand the cause of this condition, AHM would like to collect information from the vehicle prior to you attempting a repair of any kind.
- [A23\-039](/bulletins/11002711.md), 2024-07-01, Service bulletin: VISIBILITY/WIPER. Service Bulletin \- Due to a new North America regulation which introduces a new refrigerant and oil requirement, the compressor shaft seal may leak. American Honda is extending the warranty on the A/C compressor shaft seal from the original 3 years to 10 years from the original date of purchase, with no mileage limitation. The new refrigerant and oil may cause swelling of the compressor shaft seal. The swelling may lead to abnormal wearing of the seal which may increase seal gaps around the compressor shaft allowing refrigerant to leak out.
- [A19\-091](/bulletins/11002705.md), 2024-07-01, Service bulletin: VISIBILITY/WIPER. Service Bulletin \- American Honda is extending the warranty on the A/C condenser to 10 years from the original date of purchase with unlimited miles. This warranty extension only covers vehicles that have a defective A/C condenser from the factory. The A/C condenser was not manufactured to specification. As a result, corrosion may develop in the form of tiny holes in the condenser tube walls that allow the refrigerant to leak out.
- [ATI\&05312024902](/bulletins/11000713.md), 2024-06-03, Other: ELECTRICAL SYSTEM. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2020\-2021 Civics, 2020\-2022 CR\-Vs, 2022\-2023 Pilots \& Passports with a customer complaint of the center display flickering, flashing, or frozen \(Civics and CR\-Vs only\). To better understand the cause of this condition, AHM would like to collect information from the vehicle prior to you attempting a repair of any kind.
- [ATI\&05172024908](/bulletins/11000281.md), 2024-05-22, Other: ELECTRICAL SYSTEM. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2020\-2021 Civics, 2020\-2022 CR\-Vs, 2022\-2023 Pilots \& Passports with a customer complaint of the center display flickering, flashing, or frozen \(Civics and CR\-Vs only\). To better understand the cause of this condition, AHM would like to collect information from the vehicle prior to you attempting a repair of any kind.
- [ATI\&05032024906](/bulletins/11000133.md), 2024-05-15, Other: ELECTRICAL SYSTEM. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2020\-2021 Civics, 2020\-2022 CR\-Vs, 2022\-2023 Pilots \& Passports with a customer complaint of the center display flickering, flashing, or frozen \(Civics and CR\-Vs only\). To better understand the cause of this condition, AHM would like to collect information from the vehicle prior to you attempting a repair of any kind.
- [ATI\&04152024904](/bulletins/10253304.md), 2024-04-17, Service bulletin: ELECTRICAL SYSTEM. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2020\-2021 Civics, 2020\-2022 CR\-Vs, 2022\-2023 Pilots \& Passports with a customer complaint of the center display flickering, flashing, or frozen \(Civics and CR\-Vs only\). To better understand the cause of this condition, AHM would like to collect information from the vehicle prior to you attempting a repair of any kind.
- [ATI\&03252024906](/bulletins/10252474.md), 2024-04-03, Service bulletin: ELECTRICAL SYSTEM. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2020\-2021 Civics, 2020\-2022 CR\-Vs, 2022\-2023 Pilots \& Passports with a customer complaint of the center display flickering, flashing, or frozen \(Civics and CR\-Vs only\). To better understand the cause of this condition, AHM would like to collect information from the vehicle prior to you attempting a repair of any kind.
- [ATI\&03212024910](/bulletins/10252082.md), 2024-03-26, Service bulletin: ELECTRICAL SYSTEM. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2020\-2021 Civics \& 2020\-2022 CR\-Vs with a customer complaint of the center display flickering, flashing, or frozen. To better understand the cause of this condition, AHM would like to collect information from the vehicle prior to you attempting a repair of any kind.
- [ATI\&02292024906](/bulletins/10251162.md), 2024-03-04, Service bulletin: EQUIPMENT:ELECTRICAL:INFOTAINMENT; ELECTRICAL SYSTEM. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2020\-2021 Civics \& 2020\-2022 CR\-Vs with a customer complaint of the center display flickering, flashing, or frozen. To better understand the cause of this condition, AHM would like to collect information from the vehicle prior to you attempting a repair of any kind.
- [ATI\&02152024901](/bulletins/10250725.md), 2024-02-27, Service bulletin: EQUIPMENT:ELECTRICAL:INFOTAINMENT:VIDEO \(TOUCH\)SCREEN/MONITOR/UNIT; ELECTRICAL SYSTEM; EQUIPMENT:ELECTRICAL:INFOTAINMENT. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2020\-2021 Civics \& 2020\-2022 CR\-Vs with a customer complaint of the center display flickering, flashing, or frozen. To better understand the cause of this condition, AHM would like to collect information from the vehicle prior to you attempting a repair of any kind.
- [A23\-039](/bulletins/10249628.md), 2024-02-03, Service bulletin: VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM; VISIBILITY. Service Bulletin \- Due to a new North America regulation which introduces a new refrigerant and oil requirement, the compressor shaft seal may leak. American Honda is extending the warranty on the A/C compressor shaft seal from the original 3 years to 10 years from the original date of purchase, with no mileage limitation. The new refrigerant and oil may cause swelling of the compressor shaft seal. The swelling may lead to abnormal wearing of the seal which may increase seal gaps around the compressor shaft allowing refrigerant to leak out.
- [A21\-068](/bulletins/10244663.md), 2023-11-01, Service bulletin: VEHICLE SPEED CONTROL. Service Bulletin \- The ACC system error message comes on while driving when outside temperatures are low/near freezing due to snow and ice getting stuck to the front of the millimeter wave radar. This can cause DTC P2583\-76 \(Temporary stop of Integrated Driver Support System \[Misalignment Millimeter Wave Radar\]\) to be stored.
- [A21080A](/bulletins/10244299.md), 2023-10-25, Service bulletin: VEHICLE SPEED CONTROL; FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL. Service News \- If an Adaptive Cruise Control System Problem comes back on when the vehicle is driven in freezing conditions, inform the customer it is likely due to snow or ice buildup on the radar. Advise the customer of the following procedure to clean the front grille where the radar is located.

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