Service bulletin B21-028

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	10202909
Published by NHTSA	2021-11-03
Manufacturer's number	B21-028
Manufacturer's date	2021-10-26
NHTSA component	POWER TRAIN; ENGINE AND ENGINE COOLING

NHTSA's summary

Service Bulletin - The MIL comes on with DTC P061B (PCM Internal Malfunction) is 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

Engine, Transmission and driveline

Trouble codes named

P061B

Vehicles listed
ACURA RDX	2019, 2020, 2021
ACURA TLX	2021, 2022

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

Recalls for the same vehicles and component
2021731	2021-12-03. Powertrain
21V939000	2021-12-02. POWER TRAIN:DRIVELINE:DRIVESHAFT

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
B25-049	2025-09-23. Service bulletin. Service Bulletin - Oil leak at the cam chain tensioner inspection cover due to and insufficient sealant adhesion on the inspection cover.
B25-048	2025-09-23. Service bulletin. Service Bulletin - Oil leak at the cam chain tensioner inspection cover due to and insufficient sealant adhesion on the inspection cover.
B23-010	2024-04-03. Service bulletin. Service Bulletin - During engine start in cold conditions, a miscalculation in the PCM causes the air-fuel ratio to exceed DTC rich criteria.
B20-053	2024-03-19. Service bulletin. 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.
ONL6WU04282023	2023-05-04. Service bulletin. 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.
BTI&03282023902	2023-04-04. Service bulletin. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2020-2022 MDXs & RDXs with a client 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. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
B23-010	2023-03-23. Service bulletin. 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)
BTI&03132023906	2023-03-18. Service bulletin. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2020-2022 MDXs & RDXs with a client 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. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.
BTI&02232023904	2023-03-02. Service bulletin. Dealer Message - American Honda Motor Co., Inc. (AHM) is investigating certain 2020-2022 MDXs & RDXs with a client 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.
BTI&02072023902	2023-02-15. Service bulletin. Dealer Message- American Honda Motor Co., Inc. (AHM) is investigating certain 2020-2022 MDXs & RDXs with a client 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. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to you attempting a repair of any kind.