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Service bulletins for the 2018 Honda Odyssey

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.

278 on file from NHTSA, as of 2026-10-19.

By type

By component

By trouble code

Only bulletins with component: Electrical system are shown. Show all

Bulletins, newest first
A23-0232023-04-22. Service bulletin. ELECTRICAL SYSTEM:STARTER ASSEMBLY; ENGINE AND ENGINE COOLING. Service Bulletin - The engine will not crank on initial startup after precipitation and sub-freezing temperatures. Water can enter the starter motor, and when temperatures drop below freezing, the water will freeze inside the starter motor. This will prevent the starter from cranking the engine.
ATI&011920232023-01-25. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017-2018 Odyssey, Pilot, Ridgeline with a customer complaint of the vehicle running rough or in low power mode with the Malfunction Indicator Light (MIL) on with one or more of the DTC listed below (in Qualifiers) stored. 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.
ONL6HO102120222022-10-24. Service bulletin. ELECTRICAL SYSTEM; BACK OVER PREVENTION. Owner Notification Letter - Our records indicate that a PRODUCT UPDATE has not been completed on this vehicle (Vehicle Identification Number [VIN NUMBER]). On certain 2018 Odyssey EX, EX-L, Touring, and Elite trim levels, the Display Audio and rearview camera stay off during a quick ignition cycle. To correct this, an audio software update is available. Honda strongly recommends updating your vehicle as soon as possible.
A22-0272022-09-27. Service bulletin. ELECTRICAL SYSTEM. "Service Bulletin - Audio sound will stop and No Audio Connection message appears in the audio display. NOTE: This is not related to MOST Ring break conditions." "Service Bulletin - Audio sound will stop and No Audio Connection message appears in the audio display. NOTE: This is not related to MOST Ring break conditions."
A22-0272022-09-09. Service bulletin. ELECTRICAL SYSTEM. Service bulletin - Audio sound will stop and No Audio Connection message appears in the audio display. Audio amplifier software error.
A22-0012022-09-09. Service bulletin. ELECTRICAL SYSTEM. Service bulletin - On February of 2022, the 3G network will no longer support the in-vehicle services that the vehicle has previously supported. As of August 23, 2022, the Product Improvement Campaign has ended. The TCU can no longer be updated using Over The Air updates. If the customer needs to restore TCU services, the only option is to replace the TCU. This would be done as a customer pay repair.
A22-0272022-09-09. Service bulletin. ELECTRICAL SYSTEM. "Service bulletin - Audio sound will stop and No Audio Connection message appears in the audio display. NOTE: This is not related to MOST Ring break conditions."
ONLH6CODY08082022022-09-09. Service bulletin. ELECTRICAL SYSTEM. Customer letter - Our records indicate that a Product Update has not been completed on this vehicle . The audio/information screen may show the clock being off by 1 hour. To correct this, an audio software update is available. Honda strongly recommends updating your vehicle as soon as possible.
A22-0102022-07-07. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; STRUCTURE; VISIBILITY. Service bulletin - When activating the sliding door power window auto-up feature, the window rolls up halfway and then rolls back down. There could be a pinch detection software compatibility issue between the power window regulator control unit and the rear window switch.
24142_honda_6gb_2022-07-07. Service bulletin. COMMUNICATION:MANUFACTURER TELEMATICS; ELECTRICAL SYSTEM. "Notice - Our records indicate that a PRODUCT IMPROVEMENT UPDATE has not been completed on this vehicle (Vehicle Identification Number [VIN NUMBER]). The date for updating vehicles was extended from February 22, 2022 to August 22, 2022. As of August 23, 2022, the 3G network will no longer support the in-vehicle services that the vehicle has previously supported. The Telematics Control Unit (TCU) using the Over the Air (OTA) update is required to connect to the VoLTE network to continue communications. Honda strongly recommends updating your vehicle as soon as possible, or risk having to replace the TCU at your cost."
ONL6GB012620222022-02-04. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. Owner Notification Letter - On February 22, 2022, the 3G network will no longer support the in-vehicle services that previously were supported for your vehicle. The Telematics Control Unit (TCU) in your vehicle must be updated using the Over the Air (OTA) update to connect to the VoLTE network to continue communications. Honda strongly recommends updating your vehicle as soon as possible. After February 22, 2022, restoring services will require a customer pay TCU replacement performed by a service technician at an authorized dealer.
A22-0012022-02-04. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. Service Bulletin - On February 22, 2022 the current 3G network that the vehicle connects to for services, will no longer be in-service. The Telematics Control Unit (TCU) Over the Air Update (OTA) is required to connect to the VoLTE network to continue communications.
ABOM011420222022-01-19. Service bulletin. ELECTRICAL SYSTEM; COMMUNICATION:MANUFACTURER TELEMATICS. Dealer Message - Today, January 14, 2022, Honda is announcing a product improvement campaign (PIC) for certain 2018-2020 Odyssey, 2019-2021 Passport, and 2019-2022 Pilot vehicles to update the telematics control unit (TCU) software for an upcoming network service change. Perform an iN VIN status inquiry to determine which units in your inventory are affected.
A22-0012022-01-19. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT:ELECTRICAL:INFOTAINMENT:BLUETOOTH/WIFI; COMMUNICATION:MANUFACTURER TELEMATICS. Service Bulletin - On February 22, 2022 the current 3G network that the vehicle connects to for services, will no longer be in-service. The Telematics Control Unit (TCU) Over the Air Update (OTA) is required to connect to the VoLTE network to continue communications.
AATS2111012021-11-24. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM; VISIBILITY. Tech Line Summary Article - Customers are reporting the windows roll up partially but stop and roll back down when attempting to close the sliding door windows using the Auto-Up feature. An investigation of the complaint has identified a software compatibility issue between the window switch and window regulator. We are currently working on a fix, but there is currently no recommended repair. Until a repair is made available, advise the customer to close the window using manual operation by lightly pulling up on the switch until the desired position is reached. Also, they should avoid pulling up firmly on the switch to prevent activating automatic operation and the Auto-Up feature.
ATI&092320219012021-10-06. Service bulletin. LATCHES/LOCKS/LINKAGES:DOORS:LOCK; ELECTRICAL SYSTEM. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2018-2021 Odysseys with a customer complaint of the fuel door not opening, not closing or the gauge cluster displaying error for fuel lid open when it is actually closed. 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.
AJA178812021-09-15. Service bulletin. ELECTRICAL SYSTEM. Job Aid - This job aid contains information on the MOST Bus Network and troubleshooting information for common problems.
AJA178812021-09-09. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. Job Aid - This job aid contains information on the MOST Bus Network and troubleshooting information for common problems.
A17-0902021-09-09. Service bulletin. VISIBILITY:POWER WINDOW DEVICES AND CONTROLS; VISIBILITY; ELECTRICAL SYSTEM:SOFTWARE. Service Bulletin - Under certain conditions, the rear window switch internal software enters an unstable condition and cannot recover, making the window switch inoperable.
APOC051020212021-05-25. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT:APPLIANCE:TV/RADIO/SPEAKERS. Dealer Message - On February 18, 2021, American Honda announced a warranty extension for certain 2018-20 Odyssey, 2019-20 Passport, and 2019-20 Pilot vehicles. This warranty extension covers communication issues in the MOST bus network where the vehicle may have popping or crackling from the speakers, no sound from the audio system, a Network Loss message, or display issues.
A20-0592021-05-25. Service bulletin. BACK OVER PREVENTION; ELECTRICAL SYSTEM. Service Bulletin - The Display Audio and rearview camera stay off during a quick ignition cycle.
ONLR9Q040520212021-04-15. Service bulletin. ELECTRICAL SYSTEM. Owner Notification Letter - On some 2018-20 Odyssey models, a loose connection in the MOST bus network is causing a popping or crackling from the speakers or no sound from the audio system. There may also be a Network Loss message and/or display issues. For these vehicles that display any of the above symptoms and it is determined that the symptoms relate to the MOST bus network connectors, American Honda is extending the warranty for the MOST bus network on these vehicles to 5 years or 60,000 miles from the original date of purchase, whichever comes first.
ABOM021820212021-02-26. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. Dealer Message - Today, February 18, 2021, American Honda is announcing a warranty extension for certain 2018-20 Odyssey, 2019-20 Passport, and 2019-20 Pilot vehicles. This warranty extension covers communication issues in the MOST bus network where the vehicle may have popping or crackling from the speakers, no sound from the audio system, a Network Loss message, or display issues. American Honda is extending the warranty for the MOST bus network connectors on these vehicles to 5 years or 60,000 miles from the original date of purchase, whichever comes first.
A21-0132021-02-26. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. Service Bulletin - A loose connection in the MOST bus network is causing a popping or crackling from the speakers or no sound from the audio system. There may also be a Network Loss message and/or display issues.
A20-0492021-02-26. Service bulletin. EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY; ELECTRICAL SYSTEM. Service Bulletin - There is a popping or crackling from the speakers or no sound from the audio system. You may also see a Network Loss message and/or display issues.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.