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2021 Toyota Camry B15A804 DTC and DCM Update

Toyota has issued a Technical Service Bulletin (TSB 10187269) for the 2021 Toyota Camry and other models addressing Diagnostic Trouble Code (DTC) B15A804, along with various issues related to the Toyota App and 12V battery drain. A DCM reset and firmware update is available to fix these problems.

Byeditor david chen2021 Toyota Camry
2021 TOYOTA Camry — Toyota Camry B15A804
Editorial illustration generated for this article.
B15A80410187269Red SOS LED stays on after bulb checkToyota App does not accept the activation codeToyota App is inoperativeSOS call center does not receive the vehicle’s location in a timely mannerToyota App shows an error 42 when trying to execute a commandUnable to remote start the vehicle with the key fobUnable to subscribe to remote servicesUnable to activate Wi-Fi

Gilt auch für

Toyota Avalon
2021
Toyota Corolla
2021
Toyota RAV4
2021

Symptoms

Owners of a 2021 Toyota Camry may experience a range of issues related to the vehicle's communication systems and 12V battery. These symptoms are often accompanied by the Diagnostic Trouble Code (DTC) B15A804. The specific conditions that may be observed include:

  • The "Red SOS LED stays on after bulb check."
  • The "Toyota App does not accept the activation code."
  • The "Toyota App is inoperative."
  • The "SOS call center does not receive the vehicle’s location in a timely manner."
  • The "Toyota App shows an error 42 when trying to execute a command."
  • "Unable to remote start the vehicle with the key fob" (if equipped).
  • "Unable to subscribe to remote services."
  • "Unable to activate Wi-Fi."
  • "Destination Assist is inoperative."
  • A "Depleted 12V vehicle battery when in IG-OFF."

These conditions, including the presence of the Toyota Camry B15A804 DTC, indicate a potential issue with the vehicle's Data Communication Module (DCM).

Fault Codes / DTCs

The primary Diagnostic Trouble Code associated with these symptoms is:

Code Description
B15A804 DCM communication error / related issues

This DTC may be present in either current or historical fault records within the vehicle's system.

Diagnosis / Trigger Conditions

The presence of DTC B15A804, either current or in history, along with any of the listed operational issues or warning messages, indicates the need for further action. These symptoms suggest a malfunction within the Data Communication Module (DCM) that affects various connected services and potentially the vehicle's 12V battery health. The Toyota Camry B15A804 code specifically points to an internal communication or functionality problem within this module.

Repair Procedure Summary

To address the DTC B15A804 and the associated symptoms, Toyota has released a specific procedure involving a Data Communication Module (DCM) reset and firmware update. This update is designed to correct the underlying software issues causing these malfunctions. Technicians are instructed to follow the detailed DCM Reset and Firmware Update Procedure outlined in the bulletin to ensure proper resolution.

Owner Action

If you own a 2021 Toyota Camry and are experiencing any of the described symptoms or have encountered the Toyota Camry B15A804 DTC, it is recommended to contact your authorized Toyota dealership. They will be able to diagnose the issue and perform the necessary DCM reset and firmware update. This service is typically covered under warranty for eligible vehicles.

Source: NHTSA ID: 10187269

Frequently Asked Questions

What does the B15A804 DTC mean for my 2021 Toyota Camry?
The B15A804 Diagnostic Trouble Code in your 2021 Toyota Camry indicates a problem with the Data Communication Module (DCM), which can lead to issues with the Toyota App, SOS services, remote functions, and even cause a "Depleted 12V vehicle battery when in IG-OFF."
My Toyota App isn't working and shows 'error 42'. Is this related to the B15A804 code?
Yes, an inoperative Toyota App, including displaying 'error 42' or not accepting activation codes, is one of the symptoms directly linked to the B15A804 DTC and a malfunctioning Data Communication Module (DCM) in your 2021 Toyota Camry.
How can I fix the B15A804 issue and related problems in my 2021 Toyota Camry?
The recommended fix for the B15A804 DTC and associated symptoms in your 2021 Toyota Camry is a Data Communication Module (DCM) reset and firmware update. You should schedule an appointment with your Toyota dealership to have this procedure performed.
Why is my 12V battery draining when the car is off, and could it be related to the B15A804 code?
A 'Depleted 12V vehicle battery when in IG-OFF' is indeed one of the conditions that can be caused by the issues addressed by TSB 10187269, which includes the B15A804 DTC. The faulty Data Communication Module (DCM) may be drawing excessive power, leading to battery drain.

Weitere Revisionen dieses TSB

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