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Service bulletin A23-031

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10234580
Published by NHTSA2023-04-20
Manufacturer's numberA23-031
Manufacturer's date2023-04-07
NHTSA componentENGINE AND ENGINE COOLING; POWER TRAIN

NHTSA's summary

Service Bulletin - The vehicle message "All Wheel Drive System Problem" is shown on the dash. The possible cause is the machining marks on the motor shaft allowed differential oil to be pulled into the motor assembly.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Engine, Transmission and driveline

Vehicles listed
HONDA CR-V2020, 2021

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
A26-0182026-10-01. Service bulletin. 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).
A26-0162026-10-01. Service bulletin. 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).
AEBM082620269012026-08-27. Other. 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.
A26-0182026-08-27. Service bulletin. 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.
A26-0162026-08-27. Service bulletin. 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.
ATI&042720269032026-04-30. Other. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2021 CR-V FHEVs with a customer complaint of an oil leak coming from the passenger side transmission/differential oil seal. The leak may also be found during normal service or an oil change. 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.
ATI&041020269062026-04-22. Other. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2021 CR-V FHEVs with a customer complaint of an oil leak coming from the passenger side transmission/differential oil seal. The leak may also be found during normal service or an oil change. 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.
ATI&032720269032026-04-03. Other. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2021 CR-V FHEVs with a customer complaint of an oil leak coming from the passenger side transmission/differential oil seal. The leak may also be found during normal service or an oil change. 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.
ATI&031120269012026-03-16. Other. Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2021 CR-V FHEVs with a customer complaint of an oil leak coming from the passenger side transmission/differential oil seal. The leak may also be found during normal service or an oil change. 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.
A25-0772025-08-08. Service bulletin. Service Bulletin - Oil leak at timing chain tensioner inspection cover due to possible insufficient sealant adhesion on inspection cover.