Service bulletin A21-049

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)
Type	Service bulletin
NHTSA id	10194464
Published by NHTSA	2021-05-25
Manufacturer's number	A21-049
Manufacturer's date	2021-05-18
NHTSA component	ELECTRICAL SYSTEM:SOFTWARE; ELECTRICAL SYSTEM:12V/24V/48V BATTERY

NHTSA's summary

Service Bulletin - The MIL comes on with DTC P0236 (Turbocharger Boost Sensor Circuit Range/Performance Problem) stored.

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

Electrical system, 12-volt battery, Software

Trouble codes named

P0236

Vehicles listed
HONDA ACCORD	2018, 2019, 2020, 2021

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

Recalls for the same vehicles and component
20V798000	2020-12-17. ELECTRICAL SYSTEM:PROPULSION SYSTEM:CHARGING:MODULE:SOFTWARE; ELECTRICAL SYSTEM:PROPULSION SYSTEM:DC/DC CONVERTER; ELECTRICAL SYSTEM:12V/24V/48V BATTERY

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
A22-009	2022-07-07. Service bulletin. "Service bulletin - The MIL comes on with DTC P2DE1 (Cold Start Air Fuel Ratio Control System Rich). A new cold start emission reduction strategy was applied to detect air fuel ratio abnormalities. When certain fuel and vehicle shutoff conditions are present, the LAF sensor may incorrectly judge the air fuel ratio to be rich."
APaS04162019903	2019-04-23. Service bulletin. Dealer Message - American Honda Motor Co, Inc. (AHM) has been collecting batteries from certain models under certain conditions. If you have replaced an OEM battery on a qualified vehicle, please follow the procedure below.
APaS04162019902	2019-04-23. Service bulletin. Dealer Message - American Honda Motor Co., Inc. (AHM) is interested in collecting batteries from multiple models. If you have replaced an OEM battery on a qualified vehicle, please follow the procedure below.
APaS04162019901	2019-04-23. Service bulletin. Dealer Message - American Honda Motor Co., Inc. (AHM) is interested in collecting batteries from multiple models. If you have replaced an OEM battery on a qualified vehicle, please follow the procedure below.
6HB_ONL1-25-2019	2019-02-10. Service bulletin. "Owner notification letter - On some 2018 Accord Hybrid vehicles, if an incorrect high voltage (HV) battery is installed the DTC P0A80 (Replace Hybrid Battery Pack) will be set. If the correct HV battery is subsequently installed, the DTC P0A80 cannot be cleared as required and may lead to a failed Inspection and Maintenance test. The new software version eliminates this issue."
ABOM12112018901	2018-12-30. Service bulletin. "Dealer message - Today American Honda notiﬁed all dealers of an emissions recall on certain units of the 2018 Accord Hybrid for DTC P0A80: Replace HV Battery Pack where this code cannot be cleared. Refer to your eResponsibility report or do an iN VIN status inquiry to determine which units in your inventory are aﬀected."
A18-116	2018-12-30. Service bulletin. "Service bulletin - If an incorrect high voltage (HV) battery is installed, the DTC P0A80 (Replace Hybrid Battery Pack) will be set. If the correct HV battery is subsequently installed the Permanent DTC P0A80 cannot be cleared as required and may lead to a failed Inspection and Maintenance test. The new software version eliminates this issue."