2021 Acura TLX Technical Service Bulletins

113 technical service bulletins (TSBs) are on record for the 2021 Acura TLX. 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.

• 11033179May 18, 2026Electrical system. Over The Air Update - Vehicles equipped with the System Updates application are capable of downloading and installing Over the Air System Updates. System Updates contain upgrades that fix a variety of operational errors and/or enhancements that add new functionality. Information for the various software releases can be found in this document. Software version: D.1.6.4
• 11023273Sep 17, 2025Engine. Service Bulletin - Oil leak at the cam chain tensioner inspection cover due to and insufficient sealant adhesion on the inspection cover.
• 11017032Apr 9, 2025Visibility (wipers, defrost, mirrors). Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2022- 2024 MDXs & 2021-2025 TLXs with a client complaint of a loose or detached rearview mirror bracket. To better 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.
• 11014327Feb 12, 2025Suspension. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2021-2023 TLX ADV’s and 2021-2025 TLX Type S’s with a client complaint of the “Adaptive Damper System Problem” (ADS) error message on the MID (Multi Information Display). To better 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.
• 11013338Jan 24, 2025Suspension. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2021-2023 TLX ADV’s and 2021-2025 TLX Type S’s with a client complaint of the “Adaptive Damper System Problem” (ADS) error message on the MID (Multi Information Display). To better 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.
• 11013127Jan 18, 2025Suspension. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2021-2023 TLX ADV’s and 2021-2025 TLX Type S’s with a client complaint of the “Adaptive Damper System Problem” (ADS) error message on the MID (Multi Information Display). To better 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.
• 11013111Jan 3, 2025Suspension. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2021-2023 TLX ADV’s and 2021-2025 TLX Type S’s with a client complaint of the “Adaptive Damper System Problem” (ADS) error message on the MID (Multi Information Display). To better 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.
• 11012816Dec 18, 2024Electrical system. Service Bulletin - A coaxial cable terminal was not manufactured to proper specifications. An improperly manufactured terminal may lead to poor communication in the media-oriented system (MOST) bus network which can potentially affect the audio sound quality.
• 11011797Dec 3, 2024Suspension. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2021-2023 TLX ADV’s and 2021-2025 TLX Type S’s with a client complaint of the “Adaptive Damper System Problem” (ADS) error message on the MID (Multi Information Display). To better 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.
• 11010681Nov 14, 2024Suspension. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2021-2023 TLX ADV’s and 2021-2025 TLX Type S’s with a client complaint of the “Adaptive Damper System Problem” (ADS) error message on the MID (Multi Information Display). To better 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.
• 11010123Oct 30, 2024Suspension. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2021-2023 TLX ADV’s and 2021-2025 TLX Type S’s with a client complaint of the “Adaptive Damper System Problem” (ADS) error message on the MID (Multi Information Display). To better 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.
• 11009195Oct 11, 2024Suspension. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2021-2023 TLX ADV’s and 2021-2025 TLX Type S’s with a client complaint of the “Adaptive Damper System Problem” (ADS) error message on the MID (Multi Information Display). To better 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.
• 11008046Sep 21, 2024Suspension. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2022-2025 MDX Type S's & 2021-2025 TLX ADV's or Type S's with a client complaint of the “Adaptive Damper System Problem” (ADS) error message on the MID (Multi Information Display). To better 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.
• 11008048Sep 18, 2024Electrical system. Owner Notification Letter - A coaxial cable terminal was not manufactured to proper specifications. An improperly manufactured terminal may lead to poor communication in the media-oriented system (MOST) bus network which can potentially affect the audio sound quality.
• 11007893Sep 10, 2024Suspension. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2022-2025 MDX Type S's & 2021-2025 TLX ADV's or Type S's with a client complaint of the “Adaptive Damper System Problem” (ADS) error message on the MID (Multi Information Display). To better 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.
• 11007651Sep 6, 2024Suspension. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2022-2025 MDX Type S's & 2021-2025 TLX ADV's or Type S's with a client complaint of the “Adaptive Damper System Problem” (ADS) error message on the MID (Multi Information Display). To better 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.
• 11006809Aug 26, 2024Suspension. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2021-2023 TLX ADV’s and 2021-2025 TLX Type S’s with a client complaint of the “Adaptive Damper System Problem” (ADS) error message on the MID (Multi Information Display). To better 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.
• 11005524Jul 30, 2024Electrical system. Service Bulletin - A coaxial cable terminal was not manufactured to proper specifications. An improperly manufactured terminal may lead to poor communication in the media-oriented system transport (MOST) bus network which can potentially affect the audio sound quality.
• 11005521Jul 30, 2024Electrical system. Dealer Message - A coaxial cable terminal was not manufactured to proper specifications. An improperly manufactured terminal may lead to poor communication in the Media Oriented System Transport (MOST) bus network which can potentially affect the audio sound quality.
• 10252481Mar 27, 2024Transmission and drivetrain. Service Bulletin - During engine start in cold conditions, a miscalculation in the PCM causes the air-fuel ratio to exceed DTC rich criteria.
• 10251896Mar 12, 2024Engine cooling, Electrical system. Service Bulletin - The MIL is flashing with a loss of power. This is most common in hot, humid regions, or after a period of rainfall. Humid air within the intake passage may condense and accumulate moisture during steady driving which enters the engine and may cause a misfire and a flashing MIL.
• 10244255Oct 11, 2023Brakes. Service Bulletin - The vehicle's brakes may exhibit a groan, squeal, or squeak noise, most commonly after the vehicle sits for a prolonged period and the brakes are cold. This noise will typically disappear after the first few brake applications.
• 10242214Sep 5, 2023Equipment, Electrical system. Service Bulletin - The client may experience a popping or crackling noise from the speakers, a blank display, or no sound from the audio system. They may also see a Network Loss message.
• 10235553Apr 28, 2023Engine cooling. Owner Notification Letter - An owner's notification that the owner has not completed the emissions recall for an improperly functioning on-board emission-related diagnostic system.
• 10233293Mar 24, 2023Brakes, Equipment. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for any & all 2022 MDX Type Ss & 2021-2022 TLXs that match the criteria listed below. Qualifiers AHM is interested ONLY if the vehicle meets the following requirements: 1. Manufactured date on the Driver’s door jamb must be between 1/2019 & 9/2021. 2. No DTC stored. 3. Electric Servo Brake (ESB) system has not been replaced previously.
• 10233209Mar 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)
• 10232971Mar 10, 2023Brakes. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for any & all 2022 MDX Type Ss & 2021-2022 TLXs that match the criteria listed below. Qualifiers AHM is interested ONLY if the vehicle meets the following requirements: 1. Manufactured date on the Driver’s door jamb must be between 1/2019 & 9/2021. 2. No DTC stored. 3. Electric Servo Brake (ESB) system has not been replaced previously.
• 10232251Feb 23, 2023Brakes. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for any & all 2022 MDX Type Ss & 2021-2022 TLXs that match the criteria listed below. Qualifiers AHM is interested ONLY if the vehicle meets the following requirements: 1. Manufactured date on the Driver’s door jamb must be between 1/2019 & 9/2021. 2. No DTC stored. 3. Electric Servo Brake (ESB) system has not been replaced previously.
• 10231831Feb 7, 2023Brakes. Dealer Message- American Honda Motor Co., Inc. (AHM) is searching for any & all 2022 MDX Type Ss & 2021-2022 TLXs that match the criteria listed below. AHM is interested ONLY if the vehicle meets the following requirements: 1. Manufactured date on the Driver’s door jamb must be between 1/2019 & 9/2021. 2. No DTC stored. 3. Electric Servo Brake (ESB) system has not been replaced previously.
• 10230599Jan 18, 2023Brakes. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for any & all 2022 MDX Type Ss & 2021-2022 TLXs that match the criteria listed below.
• 10229693Jan 3, 2023Equipment. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for any & all 2022 MDX Type Ss & 2021-2022 TLXs that match the criteria listed below.
• 10229692Jan 3, 2023Brakes. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for any & all 2022 MDX Type Ss & 2021-2022 TLXs that match the criteria listed below.
• 10228203Dec 13, 2022Engine cooling. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2020-2021 RDXs & TLX L4s with a client 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.
• 10228200Dec 13, 2022Brakes. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for any & all 2022 MDX Type Ss & 2021-2022 TLXs that match the criteria listed below. Qualifiers AHM is interested ONLY if the vehicle meets the following requirements: 1. Manufactured date on the Driver’s door jamb must be between 1/2019 & 9/2021. 2. No DTC stored. 3. Electric Servo Brake (ESB) system has not been replaced previously.
• 10227243Nov 28, 2022Brakes, Equipment. Dealer Message - Background American Honda Motor Co., Inc. (AHM) is searching for any & all 2022 MDX Type Ss & 2021-2022 TLXs that match the criteria listed below. Qualifiers AHM is interested ONLY if the vehicle meets the following requirements: 1. Manufactured date on the Driver’s door jamb must be between 1/2019 & 9/2021. 2. No DTC stored. 3. Electric Servo Brake (ESB) system has not been replaced previously.
• 10227237Nov 28, 2022Engine cooling. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2020-2021 RDXs & TLX L4s with a client 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.
• 10226210Nov 12, 2022Brakes. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for any & all 2022 MDX Type Ss & 2021-2022 TLXs that match the criteria listed below. Qualifiers AHM is interested ONLY if the vehicle meets the following requirements: 1. Manufactured date on the Driver’s door jamb must be between 1/2019 & 9/2021. 2. No DTC stored. 3. Electric Servo Brake (ESB) system has not been replaced previously.
• 10226201Nov 8, 2022Brakes. "Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for any & all 2022 MDX Type Ss & 2021-2022 TLXs that match the criteria listed below. Qualifiers AHM is interested ONLY if the vehicle meets the following requirements: 1. Manufactured date on the Driver’s door jamb must be between 1/2019 & 9/2021. 2. No DTC stored. 3. Electric Servo Brake (ESB) system has not been replaced previously.
• 10226204Nov 7, 2022Engine cooling. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2020-2021 RDXs & TLX L4s with a client 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.
• 10225479Oct 25, 2022Brakes. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for any & all 2022-2023 MDX Type Ss & 2021-2022 TLXs that match the criteria listed below. Qualifiers AHM is interested ONLY if the vehicle meets the following requirements: 1. Manufactured date on the Driver’s door jamb must be between 1/2019 & 9/2021. 2. No DTC stored. 3. Electric Servo Brake (ESB) system has not been replaced previously.
• 10224786Oct 21, 2022Engine cooling. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2020-2021 RDXs & TLX L4s with a client 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.
• 10222821Oct 6, 2022Engine cooling. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2020-2021 RDXs & TLX L4s with a client 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.
• 10222820Oct 6, 2022Brakes. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for any & all 2022-2023 MDX Type Ss & 2021-2022 TLXs that match the criteria listed below. AHM is interested ONLY if the vehicle meets the following requirements: 1. Manufactured date on the Driver’s door jamb must be between 1/2019 & 9/2021. 2. No DTC stored. 3. Electric Servo Brake (ESB) system has not been replaced previously.
• 10222078Sep 22, 2022Engine cooling, Fuel system. "Service Bulletin - The MIL comes on with DTC P0455 (Evaporative Emission [EVAP] System Very Large Leak Detected) stored. The fuel main flap unit may have stuck open, causing a DTC to set."
• 10219672Sep 2, 2022Engine cooling, Fuel system. Dealer message - The MIL comes on with DTC P0455 (Evaporative Emission [EVAP] System Very Large Leak Detected) stored. The fuel main flap unit may have stuck open, causing a DTC to set.
• 10219528Aug 16, 2022Brakes. Dealer message - American Honda Motor Co., Inc. (AHM) is searching for certain 2021-2022 TLX Type S with a client complaint of a front brake noise. The noise can be described as a squeal/moan/groan/rubbing noise. The noise can also occur while turning. To better 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.
• 10216916Jul 26, 2022Brakes. "Dealer message - American Honda Motor Co., Inc. (AHM) is searching for certain 2021-2022 TLX Type S with a client complaint of a front brake noise. The noise can be described as a squeal/moan/groan/rubbing noise. The noise can also occur while turning. To better 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."
• 10216896Jul 15, 2022Brakes. Dealer message - American Honda Motor Co., Inc. (AHM) is searching for certain 2021-2022 TLX Type S with a client complaint of a front brake noise. The noise can be described as a squeal/moan/groan/rubbing noise. The noise can also occur while turning. To better 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.
• 10216873Jul 5, 2022Brakes. Dealer message - American Honda Motor Co., Inc. (AHM) is searching for certain 2021-2022 TLXs (non-Type S) with a client complaint of a judder from the front brakes when applying the brakes. To better 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.
• 10215505Jun 20, 2022Equipment, Brakes. "Service bulletin - The front brakes make a high-pitched squeal when lightly applied at 15 mph or less. NOTE: The front brakes stop squealing once they’re warmed up. There is insufficient damping between the front brake pads and shims."

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