2021 Honda Accord Technical Service Bulletins

142 technical service bulletins (TSBs) are on record for the 2021 Honda Accord. 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.

• 11038473Oct 1, 2026Electrical system. Tech Line Summary Article - Customers may report that the center display unit changes screens on its own, registers unintended inputs, or operates erratically without user interaction. The condition may be more noticeable when vehicle interior temperatures are elevated.
• 11037687Sep 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).
• 11037426Sep 16, 2026Electrical system. Dealer Message - On August 21st, 2026, American Honda issued a Product Update for certain 2018-2022 Accord and Accord Hybrid models that received the accessory Wireless CarPlay and Android Auto upgrade. Refer to Service Bulletin 26-068 for additional information regarding the Product Update.
• 11036655Aug 31, 2026Electrical system. Tech Line Summary - Customers may report that the center display unit changes screens on its own, registers unintended inputs, or operates erratically without user interaction. The condition may be more noticeable when vehicle interior temperatures are elevated.
• 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.
• 11036336Aug 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.
• 11036326Aug 21, 2026Electrical system. Service Bulletin - On certain 2018-2022 Accord and 2018-22 Accord Hybrid vehicles equipped with the Wireless CarPlay and Android Auto software upgrade, a programming issue within the Wireless CarPlay and Android Auto software may cause an invalid "License Authentication Error" message to appear on the display audio screen after approximately 1,500 ignition ON/OFF cycles.
• 11036323Aug 21, 2026Electrical system. Dealer Message - Due to a software programming issue within the Wireless CarPlay and Android Auto system, an invalid "License Authentication Error" message may appear on the Display Audio screen after approximately 1,500 ignition switch activations ON/OFF.
• 11031760Apr 22, 2026Body and structure. Service Bulletin - There is a dull creaking, rubbing, popping, or clicking noise coming from the front of the vehicle while turning at low speeds potentially due to the bump stop contacting the top of the front damper body.
• 11026975Dec 19, 2025Electrical system. Tech Line Summary - Customers who have purchased the Accessory CarPlay /Android Auto upgrade are complaining that a pop-up message appears on the audio unit display stating, “Please insert USB drive containing valid software license file, and press OK button”. When this message is displayed, the audio unit is not responsive to control inputs, however the rear-view camera remains fully functional.
• 11026972Dec 19, 2025Electrical system. Dealer Message - Some customers have reported a pop-up message on the audio unit display stating: “Please insert USB drive containing valid software license file and press OK button.” When this message appears, the audio unit becomes unresponsive. The rear-view camera remains functional.
• 11026971Dec 19, 2025Electrical system. Dealer Message - Some customers have reported a pop-up message on the audio unit display stating: “Please insert USB drive containing valid software license file and press OK button.” When this message appears, the audio unit becomes unresponsive. The rear-view camera remains functional.
• 11021744Jul 29, 2025Engine. Service Bulletin - Oil leak at timing chain tensioner inspection cover due to possible insufficient sealant adhesion on inspection cover.
• 11015016Feb 28, 2025Body and structure. Service Bulletin - There is a dull creaking, rubbing, popping, or clicking noise coming from the front of the vehicle while turning at low speeds due to the bump stop contacting the top of the front damper body.
• 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…
• 11006533Aug 16, 2024Engine. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2018-2022 Accord 1.5Ls (no 2.0L) & FHEVs, as well as 2017-2022 CR-V 1.5Ls (no 2.4L), & 2020-2022 CR-V FHEVs with a customer complaint of the Malfunction Indicator Light (MIL) on with the DTC P030X (Cylinder Misfire Detected) stored. Customer may also experience engine running rough condition.
• 11005519Jul 26, 2024Engine. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2018-2022 Accord 1.5Ls (no 2.0L) & FHEVs, as well as 2017-2022 CR-V 1.5Ls (no 2.4L), & 2020-2022 CR-V FHEVs with a customer complaint of the Malfunction Indicator Light (MIL) on with the DTC P030X (Cylinder Misfire Detected) stored. Customer may also experience engine running rough condition.
• 11001421Jun 4, 2024Electrical system. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2018-2022 Accords with customer complaint of Charging System Problem (battery icon) or Auto Engine Idle Stop Problem Lamp coming on the Multi-Information Display (MID). To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to your attempting a repair of any kind.
• 11000712May 31, 2024Electrical system, Engine. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2018-2022 Accords with customer complaint of Charging System Problem (battery icon) or Auto Engine Idle Stop Problem Lamp coming on the Multi-Information Display (MID). To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to your attempting a repair of any kind.
• 11000280May 18, 2024Engine, Electrical system. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2018-2022 Accords with customer complaint of Charging System Problem (battery icon) or Auto Engine Idle Stop Problem Lamp coming on the Multi-Information Display (MID). To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to your attempting a repair of any kind.
• 11000130May 3, 2024Engine, Electrical system. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2018-2022 Accords with customer complaint of Charging System Problem (battery icon) or Auto Engine Idle Stop Problem Lamp coming on the Multi-Information Display (MID). To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to your attempting a repair of any kind.
• 11000139May 2, 2024Engine. Service Bulletin - During engine start in cold conditions, a miscalculation in the PCM causes the air-fuel ratio to exceed DTC rich criteria, resulting in the vehicle experiencing drivability concerns. This issue is most common in regions with cold weather.
• 10253298Apr 8, 2024Electrical system. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2018-2022 Accords with customer complaint of Charging System Problem (battery icon) or Auto Engine Idle Stop Problem Lamp coming on the Multi-Information Display (MID). To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to your attempting a repair of any kind.
• 10252079Mar 21, 2024Electrical system. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2018-2022 Accords with customer complaint of Charging System Problem (battery icon) or Auto Engine Idle Stop Problem Lamp coming on the Multi-Information Display (MID). To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to your attempting a repair of any kind.
• 10251157Feb 29, 2024Engine cooling, Electrical system. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2018-2022 Accords with customer complaint of Charging System Problem (battery icon) or Auto Engine Idle Stop Problem Lamp coming on the Multi-Information Display (MID). To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to your attempting a repair of any kind.
• 10250741Feb 19, 2024Transmission and drivetrain. Owner Notification Letter - The driven pulley in the transmission (CVT) was not properly hardened due to improper heat treatment during the manufacturing process. Over time, this may lead to abnormal wear to the driven pulley or damage to the CVT belt which may cause the vehicle to experience a slip accompanied by an abnormal noise and multiple warning lights illuminating. This may lead to not being able to move…
• 10250732Feb 14, 2024Engine cooling, Electrical system. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2018-2022 Accords with customer complaint of Charging System Problem (battery icon) or Auto Engine Idle Stop Problem Lamp coming on the Multi-Information Display (MID). To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to your attempting a repair of any kind.
• 10249625Jan 31, 2024Electrical system, Engine cooling. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2018-2022 Accords with customer complaint of Charging System Problem (battery icon) or Auto Engine Idle Stop Problem Lamp coming on the Multi-Information Display (MID). To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to your attempting a repair of any kind.
• 10248977Jan 9, 2024Electrical system, Engine cooling. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2018-2022 Accords with customer complaint of Charging System Problem (battery icon) or Auto Engine Idle Stop Problem Lamp coming on the Multi-Information Display (MID). To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to your attempting a repair of any kind.
• 10245276Nov 7, 2023Body and structure. Service Bulletin - There is a dull creaking, rubbing, popping, or clicking noise coming from the front of the vehicle while turning at low speeds due to the bump stop contacting the top of the front damper body.
• 10244296Oct 18, 2023Brakes. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2021-2022 Accords (non-Hybrid) with customer complaint of a rear brake noise while driving in reverse. The noise can be described as humming, moaning similar to a foghorn. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to your attempting a repair of any kind.
• 10242568Sep 12, 2023Body and structure. Service News - Several customers have reported loose or unset weatherstrips at the door sash. When a car comes in with this condition, you can successfully reinstall an undamaged weatherstrip back in place until permanent countermeasure parts are available.
• 10235121Apr 17, 2023Body and structure. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2018-2022 Accords and 2022 HR-V Sports with a customer complaint of a front damper noise. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
• 10233682Mar 31, 2023Suspension. Dealer Message Request for Visit: 2018-2022 Accord & HR-V Front Damper Noise (ACTION REQUIRED)
• 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…
• 10233208Mar 14, 2023Engine cooling. Service Bulletin - Under certain circumstances, the vehicle may experience driveability concerns. This may result in the following DTC’s to set: • P0300 (Random Misfire Detected), • P0301 (No. 1 Cylinder Misfire Detected), • P0302 (No. 2 Cylinder Misfire Detected), • P0303 (No. 3 Cylinder Misfire Detected), • P0304 (No. 4 Cylinder Misfire Detected), • P0172 (Fuel System Too Rich)
• 10233202Mar 14, 2023Suspension, Body and structure. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2018-2022 Accords and 2022 HR-V Sports with a customer complaint of a front damper noise. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
• 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…
• 10232966Mar 10, 2023Body and structure. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2021-2022 Accords and 2022 HR-V Sports with a customer complaint of a front damper noise. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
• 10232243Feb 21, 2023Suspension. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2021-2022 Accords and 2022 HR-V Sports with a customer complaint of a front damper noise. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
• 10232101Feb 15, 2023Visibility (wipers, defrost, mirrors). Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2019-2022 Accords with a customer complaint of the front passenger’s window inop & 2019-2022 CR-Vs with a customer complaint of the rear passenger’s window inop. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
• 10231056Jan 25, 2023Visibility (wipers, defrost, mirrors), Electrical system. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2019-2022 Accords with a customer complaint of the front passenger’s window inop & 2019-2022 CR-Vs with a customer complaint of the rear passenger’s window inop. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
• 10231055Jan 24, 2023Electrical system, Visibility (wipers, defrost, mirrors). Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2019-2022 Accords with a customer complaint of the front passenger’s window inop & 2019-2022 CR-Vs with a customer complaint of the rear passenger’s window inop. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
• 10231062Jan 23, 2023Transmission and drivetrain. Owner Notification Letter - The driven pulley in the transmission (CVT) was not properly hardened due to improper heat treatment during the manufacturing process. Over time, this may lead to abnormal wear to the driven pulley or damage to the CVT belt which may cause the vehicle to experience a slip accompanied by an abnormal noise and multiple warning lights illuminating. This may lead to not being able to move…
• 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…
• 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.
• 10228196Dec 13, 2022Electrical system, Fuel system. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2020-2021 Accords, CR-Vs & Odysseys 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 engine hard to start, no start or start & stumble in conjunction with CEL.
• 10228193Dec 13, 2022Latches, locks and linkages, Electrical system. Service News Article - Some customers complain that their key fobs are not working (they cannot lock, unlock, or start their vehicle), with vehicles typically towed into the dealership. After technicians attempt to reprogram / re-register the key fob(s) through HDS, the pairing is unsuccessful. A new Body Control Module (BCM) must be installed to correct this issue.
• 10227774Dec 8, 2022Transmission and drivetrain. Service Bulletin - Due to an improper heat treatment during the manufacturing process, the driven pulley in the CVT was not properly hardened. Over time, this may lead to abnormal wear to the driven pulley or damage to the CVT belt which may cause the vehicle to experience a slip accompanied by an abnormal noise and multiple warning lights. Some vehicles may not move forward after coming to a stop.

← All problems reported for the 2021 Honda Accord