2021 Honda Civic Technical Service Bulletins

78 technical service bulletins (TSBs) are on record for the 2021 Honda Civic. TSBs are notes manufacturers send to dealers about repair procedures for issues seen in the field. They are not recalls and do not by themselves mean a vehicle has a fault.

• 11037695Sep 25, 2026Engine. 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).
• 11037693Sep 25, 2026Engine. 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).
• 11036424Aug 26, 2026Engine. 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.
• 11036408Aug 26, 2026Engine. 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.
• 11036407Aug 26, 2026Engine. 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.
• 11021745Jul 29, 2025Engine. Service Bulletin - Oil leak at timing chain tensioner inspection cover due to possible insufficient sealant adhesion on inspection cover.
• 11011792Dec 3, 2024Engine. 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…
• 11010549Nov 5, 2024Engine. 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…
• 11007887Sep 12, 2024Electrical 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.
• 11006244Aug 8, 2024Electrical 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.
• 11005269Jul 24, 2024Electrical 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.
• 11004269Jul 9, 2024Electrical 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.
• 11002711Jun 19, 2024Visibility (wipers, defrost, mirrors). 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.
• 11000713May 31, 2024Electrical 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.
• 11000281May 18, 2024Electrical 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.
• 11000133May 3, 2024Electrical 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.
• 10253304Apr 15, 2024Electrical 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.
• 10252474Mar 25, 2024Electrical 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.
• 10252082Mar 21, 2024Electrical 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.
• 10251162Feb 29, 2024Electrical system, Equipment. 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.
• 10250725Feb 15, 2024Equipment, 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.
• 10249628Jan 24, 2024Visibility (wipers, defrost, mirrors). 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.
• 10244663Oct 25, 2023Vehicle 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.
• 10244299Oct 17, 2023Forward collision avoidance, Vehicle speed 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.
• 10243738Sep 28, 2023Visibility (wipers, defrost, mirrors). 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.
• 10237948Jun 15, 2023Visibility (wipers, defrost, mirrors). 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.
• 10237958Jun 12, 2023Visibility (wipers, defrost, mirrors). Owner Notification Letter - Due to a new North America regulation that introduced a new refrigerant and oil requirement, the compressor shaft seal may leak. 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.
• 10237036May 19, 2023Visibility (wipers, defrost, mirrors). 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.
• 10237023May 19, 2023Visibility (wipers, defrost, mirrors). Dealer Message - Due to supplier process concerns, the A/C compressor may not have been manufactured to specifications. As a result, abnormal wearing of the rubber seal may occur causing gaps in the compressor shaft to develop allowing refrigerant to leak out.
• 10235549Apr 25, 2023Visibility (wipers, defrost, mirrors). Dealer Message - We have identified a potential concern with GUIDE, AC COMP SEAL 07AAG-5AAA100, which was a part of 6CVC SEAL REPLACEMENT KIT, 07AAC-5AAA1Z0 that was recently sent to all Honda dealers. These tools have the tool number and manufacture date laser marked on a critical surface that may contact the new A/C compressor seal during installation. The added roughness of the laser markings may cause damage to…
• 10234575Apr 5, 2023Visibility (wipers, defrost, mirrors). Service Bulletin - Customers have complained of the air conditioning system not blowing cold air due to the oil/refrigerant leak from the A/C compressor main shaft seal.
• 10233667Mar 28, 2023Fuel system, Engine cooling. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2020-2022 Accords, CR-Vs, Odysseys, Passports, Pilots, Ridgelines, 2020 Fits, 2020-2021 Civic Hatchbacks, 2020-2023 Civic Sedans/Coups with a customer complaint of the Check Engine Light (CEL) on & the DTC P0087 (Fuel Rail Pressure Too Low [Loss of Fuel Pressure]) stored. In some cases, the customer may also experience such conditions as…
• 10233206Mar 13, 2023Fuel system, Engine cooling. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2020-2022 Accords, CR-Vs, Odysseys, Passports, Pilots, Ridgelines, 2020 Fits, 2020-2021 Civic Hatchbacks, 2020-2023 Civic Sedans/Coups with a customer complaint of the Check Engine Light (CEL) on & the DTC P0087 (Fuel Rail Pressure Too Low [Loss of Fuel Pressure]) stored. In some cases, the customer may also experience such conditions as…
• 10229686Jan 3, 2023Electrical system, Fuel system. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2020-2022 Accords, CR-Vs, Odysseys, Passports, Pilots, Ridgelines, 2020 Fits, 2020-2021 Civic Hatchbacks, 2020-2023 Civic Sedans/Coups with a customer complaint of the Check Engine Light (CEL) on & the DTC P0087 (Fuel Rail Pressure Too Low [Loss of Fuel Pressure]) stored. In some cases, the customer may also experience such conditions as…
• 10229679Jan 3, 2023Electrical system. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017-2021 Civics & CR-Vs with a customer complaint of a inop, blank, or black meter display (gauge cluster) with no prior repairs made to the vehicle. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
• 10228199Dec 13, 2022Engine cooling. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2020-2021 Accord 2.0Ls & Civic 2.0Ls with a customer complaint of an oil leak or a dealer technician noticing an oil leak from the head cover gasket during a routine maintenance. To fully understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
• 10228197Dec 13, 2022Electrical system. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017-2021 Civics & CR-Vs with a customer complaint of an inop, blank, or black meter display (gauge cluster) with no prior repairs made to the vehicle. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
• 10227231Nov 28, 2022Engine cooling. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2020-2021 Accord 2.0Ls & Civic 2.0Ls with a customer complaint of an oil leak or a dealer technician noticing an oil leak from the head cover gasket during a routine maintenance. To fully understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
• 10227226Nov 28, 2022Electrical system. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017-2021 Civics & CR-Vs with a customer complaint of a inop, blank, or black meter display (gauge cluster) with no prior repairs made to the vehicle. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
• 10226197Nov 8, 2022Electrical system. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017-2021 Civics & CR-Vs with a customer complaint of a inop, blank, or black meter display (gauge cluster) with no prior repairs made to the vehicle. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
• 10226199Nov 7, 2022Engine cooling. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2020-2021 Accord 2.0Ls & Civic 2.0Ls with a customer complaint of an oil leak or a dealer technician noticing an oil leak from the head cover gasket during a routine maintenance. To fully understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
• 10226106Nov 2, 2022Electrical system. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017-2021 Civics & CR-Vs with a customer complaint of a inop, blank, or black meter display (gauge cluster) with no prior repairs made to the vehicle. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
• 10225477Oct 24, 2022Electrical system. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017-2021 Civics & CR-Vs with a customer complaint of a inop, blank, or black meter display (gauge cluster) with no prior repairs made to the vehicle. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
• 10224783Oct 21, 2022Engine cooling. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2020-2021 Accord 2.0Ls & Civic 2.0Ls with a customer complaint of an oil leak or a dealer technician noticing an oil leak from the head cover gasket during a routine maintenance. To fully understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
• 10222813Oct 6, 2022Engine cooling. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2020-2021 Accord 2.0Ls & Civic 2.0Ls with a customer complaint of an oil leak or a dealer technician noticing an oil leak from the head cover gasket during a routine maintenance. To fully understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
• 10222415Sep 27, 2022Electrical system. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017-2021 Civics & CR-Vs with a customer complaint of a inop, blank, or black meter display (gauge cluster) with no prior repairs made to the vehicle. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
• 10219641Sep 5, 2022Transmission and drivetrain. Service bulletin - Customer complains that the manual transmission will not shift, the clutch is slipping, or the vehicle won’t move when in gear. Due to supplier production issues, the friction disc material may have prematurely worn.
• 10219535Aug 22, 2022Electrical system. Dealer message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017-2021 Civics & CR-Vs with a customer complaint of a inop, blank, or black meter display (gauge cluster) with no prior repairs made to the vehicle. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
• 10216909Jul 27, 2022Electrical system. Dealer message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017-2021 Civics & CR-Vs with a customer complaint of a inop, blank, or black meter display with no prior repairs made to the vehicle. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
• 10216911Jul 26, 2022Engine cooling. Dealer message - American Honda (AHM) is investigating certain 2019-2022 Civic & CR-V 1.5Ts with customer complaint of oil leak from the timing chain case cover. To fully 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.

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