Service bulletin Customer Letter

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	10143355
Published by NHTSA	2018-08-06
Manufacturer's number	Customer Letter
Manufacturer's date	2018-07-10
NHTSA component	ELECTRICAL SYSTEM; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY

NHTSA's summary

Customer letter - In some cases, the electronic control module (ECM) misinterprets sensor inputs as a warm-up three-way catalytic converter (TWC) deterioration and turns the malfunction indicator lamp (MIL) on with diagnostic trouble code (DTC) P0420 or DTC P0430 (catalyst system efficiency below threshold) 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, Equipment and accessories

Trouble codes named

P0420, P0430

Vehicles listed
HONDA ACCORD HYBRID	2006, 2007 (the catalog's model; the bulletin names a series or trim of it)

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

Recalls for the same vehicles and component
06V270000	2006-07-26. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL

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
A21120A	2023-06-21. Service bulletin. Service News - The navigation clock and date are incorrect. This is due to a limited GPS receiver Capacity resulting in rollover of the internal chip memory; the rollover occurred on January 1, 2022, at 12:00AM local time.
A21120A	2022-02-04. Service bulletin. ServiceNews Article - The clock shows the incorrect time. This issue is due to a limited GPS receiver capacity resulting in "rollover" of the internal chip memory; the "rollover" will occur on January 1, 2022, at 12:00AM local time. As a result, once specific triggers are met, the navigation date and time will be incorrect.
DOR-D8K8Q-02	2019-03-04. Service bulletin. This SKU is a Variable Valve Timing (VVT) Solenoid. The Customer communication requested return of unsold inventory to inspect for possible incorrect wiring. Incorrect VVT solenoid wiring may cause an inability of the variable valve timing system to activate. Inability to activate the variable valve timing system may cause reduced engine performance. Incorrect VVT solenoid wiring may also cause the Malfunction Indicator Light (MIL) to illuminate.
ABOM08092018901	2018-09-04. Service bulletin. Dealer message - Today, American Honda is notifying dealers of a voluntary noncompliance recall for a small number of Honda vehicles due to an error on the replacement (service part) underhood emissions labels. American Honda previously notified CARB and the EPA for this action.
Customer Letter	2018-08-06. Service bulletin. Customer letter - In some cases, the electronic control module (ECM) misinterprets sensor inputs as a warm-up three-way catalytic converter (TWC) deterioration and turns the malfunction indicator lamp (MIL) on with diagnostic trouble code (DTC) P0420 or DTC P0430 (catalyst system efficiency below threshold) stored.
Customer Letter	2018-07-30. Service bulletin. Customer letter - In some cases, the electronic control module (ECM) misinterprets sensor inputs as a warm-up three-way catalytic converter (TWC) deterioration and turns the malfunction indicator lamp (MIL) on with diagnostic trouble code (DTC) P0420 or DTC P0430 (catalyst system efficiency below threshold) stored.
Customer Letter	2018-07-30. Service bulletin. Customer letter - In some cases, the electronic control module (ECM) misinterprets sensor inputs as a warm-up three-way catalytic converter (TWC) deterioration and turns the malfunction indicator lamp (MIL) on with diagnostic trouble code (DTC) P0420 or DTC P0430 (catalyst system efficiency below threshold) stored.
Service Bulletin	2018-07-16. Service bulletin. Service bulletin - Due to improvements in battery manufacturing efficiency, once stocks of original IMA batteries are depleted, new battery designs will be available for IMA battery replacement. Each battery type requires that its battery control software be matched to its IMA battery type. Failure to match the software with the battery will result in reduced IMA battery life.
ATS 180604	2018-07-02. Service bulletin. Tech line summary article - Is the MIL on with DTC P2271 (secondary HO2S [sensor 2] circuit signal stuck rich)? What's likely causing this is the PCM is misinterpreting the A/F sensor (sensor 1) signals, causing the PCM to think that sensor 2 is stuck rich. To fix this issue, replace both sensors.
A18-065	2018-06-11. Service bulletin. Service bulletin - This bulletin is a notification of a class action settlement relating to airbag inflators. American Honda is offering a Customer Support Program (Warranty Extension) to cover any manufacturing defects to the replacement front passengers airbag inflator only.