# Service bulletin A21\-021

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.

- Type: Service bulletin
- NHTSA id: 10198683
- Published by NHTSA: 2021\-07\-03
- Manufacturer's number: A21\-021
- Manufacturer's date: 2021\-06\-24
- NHTSA component: ELECTRICAL SYSTEM

## NHTSA's summary

Service Bulletin \- The MIL comes on with DTC U0155 \(Lost Communication with Gauge Control Module\).

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10198683-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10198683-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Electrical system

## Trouble codes named

U0155

## Vehicles listed

- 2021 HONDA ACCORD
- 2021 HONDA HR\-V
- 2022 HONDA ODYSSEY

## Other bulletins for the same vehicles and component

- [AATS31549](/bulletins/11038473.md), 2026-10-15, Service bulletin: ELECTRICAL SYSTEM. Tech Line Summary Article \- Customers may report that the center display unit changes screens on its own, registers unintended inputs, or operates erratically without user interaction. The condition may be more noticeable when vehicle interior temperatures are elevated.
- [AAHS09162026902](/bulletins/11037426.md), 2026-09-21, Other: ELECTRICAL SYSTEM. Dealer Message \- On August 21st, 2026, American Honda issued a Product Update for certain 2018\-2022 Accord and Accord Hybrid models that received the accessory Wireless CarPlay and Android Auto upgrade. Refer to Service Bulletin 26\-068 for additional information regarding the Product Update.
- [AATS31549](/bulletins/11036655.md), 2026-09-02, Other: ELECTRICAL SYSTEM. Tech Line Summary \- Customers may report that the center display unit changes screens on its own, registers unintended inputs, or operates erratically without user interaction. The condition may be more noticeable when vehicle interior temperatures are elevated.
- [A26\-068](/bulletins/11036326.md), 2026-08-24, Service bulletin: ELECTRICAL SYSTEM. Service Bulletin \- On certain 2018\-2022 Accord and 2018\-22 Accord Hybrid vehicles equipped with the Wireless CarPlay and Android Auto software upgrade, a programming issue within the Wireless CarPlay and Android Auto software may cause an invalid "License Authentication Error" message to appear on the display audio screen after approximately 1,500 ignition ON/OFF cycles.
- [AEBM08212026901](/bulletins/11036323.md), 2026-08-24, Other: ELECTRICAL SYSTEM. Dealer Message \- Due to a software programming issue within the Wireless CarPlay and Android Auto system, an invalid "License Authentication Error" message may appear on the Display Audio screen after approximately 1,500 ignition switch activations ON/OFF.
- [ATS30025](/bulletins/11026975.md), 2026-01-05, Service bulletin: ELECTRICAL SYSTEM. Tech Line Summary \- Customers who have purchased the Accessory CarPlay /Android Auto upgrade are complaining that a pop\-up message appears on the audio unit display stating, “Please insert USB drive containing valid software license file, and press OK button”. When this message is displayed, the audio unit is not responsive to control inputs, however the rear\-view camera remains fully functional.
- [APS\&12192025902](/bulletins/11026972.md), 2026-01-05, Other: ELECTRICAL SYSTEM. Dealer Message \- Some customers have reported a pop\-up message on the audio unit display stating: “Please insert USB drive containing valid software license file and press OK button.” When this message appears, the audio unit becomes unresponsive. The rear\-view camera remains functional.
- [AAR12192025901](/bulletins/11026971.md), 2026-01-05, Other: ELECTRICAL SYSTEM. Dealer Message \- Some customers have reported a pop\-up message on the audio unit display stating: “Please insert USB drive containing valid software license file and press OK button.” When this message appears, the audio unit becomes unresponsive. The rear\-view camera remains functional.
- [ATI\&06032024904](/bulletins/11001421.md), 2024-06-11, Other: ELECTRICAL SYSTEM. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2018\-2022 Accords with customer complaint of Charging System Problem \(battery icon\) or Auto Engine Idle Stop Problem Lamp coming on the Multi\-Information Display \(MID\). To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to your attempting a repair of any kind.
- [ATI\&05312024901](/bulletins/11000712.md), 2024-06-03, Other: ENGINE; ELECTRICAL SYSTEM. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2018\-2022 Accords with customer complaint of Charging System Problem \(battery icon\) or Auto Engine Idle Stop Problem Lamp coming on the Multi\-Information Display \(MID\). To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to your attempting a repair of any kind.

JSON: [/v1/bulletins/10198683](/v1/bulletins/10198683)

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