CarProblems
Service Bulletin

2021 Toyota Camry DCM Issues and DTC B15A804

Some 2021 Toyota Camry vehicles may experience Data Communication Module (DCM) issues, including Diagnostic Trouble Code (DTC) B15A804, an inoperative Toyota App, or a red SOS LED. A firmware update is available to address these problems.

Byeditor marcus weber2021 Toyota Camry
2021 TOYOTA Camry — Toyota Camry DCM issues
Editorial illustration generated for this article.
B15A804TSB 10186193Red 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

Also applies to

Toyota Avalon
2021
Toyota Corolla
2021
Toyota RAV4
2021

Some 2021 Toyota Camry vehicles may experience various communication and app-related problems due to issues with the Data Communication Module (DCM). These Toyota Camry DCM issues can manifest in several ways, affecting both the vehicle's internal systems and external connectivity features.

Symptoms

Owners of affected vehicles may observe one or more of the following conditions:

  • A Diagnostic Trouble Code (DTC) B15A804 is present in current or history.
  • The red SOS LED stays on after the bulb check, indicating a potential issue with the emergency call system.
  • The Toyota App does not accept the activation code, preventing setup or use.
  • The Toyota App is inoperative, failing to function correctly.
  • The SOS call center does not receive the vehicle’s location in a timely manner during an emergency.
  • The Toyota App shows an error 42 when attempting to execute a command.
  • The vehicle is unable to remote start with the key fob, if equipped.
  • Owners are unable to subscribe to remote services.
  • It is impossible to activate Wi-Fi services within the vehicle.
  • Destination Assist is inoperative, failing to provide navigation support.
  • A depleted 12V vehicle battery when the ignition is off (IG-OFF) may also occur.

Fault Codes / DTCs

The primary diagnostic trouble code associated with these Toyota Camry DCM issues is:

Code Description
B15A804 (No specific description provided in the bulletin, indicates a DCM fault)

This DTC points to a problem within the Data Communication Module, which is central to many of the vehicle's connected features.

Repair Procedure Summary

Toyota has identified that a DCM reset and firmware update can resolve these conditions. The repair involves updating the software within the Data Communication Module to correct the underlying issues.

The service bulletin provides a detailed

Frequently Asked Questions

What does DTC B15A804 mean for my Toyota Camry?
DTC B15A804 indicates a fault within the Data Communication Module (DCM) of your 2021 Toyota Camry. This can lead to various connectivity problems, including issues with the Toyota App and SOS services.
My Toyota App isn't working. Is this related to the DCM issue?
Yes, an inoperative Toyota App or issues with activation and remote commands (like showing 'error 42') are common symptoms of the `Toyota Camry DCM issues` described in TSB 10186193. A DCM firmware update is available to fix this.
How can I fix the red SOS LED staying on in my 2021 Toyota Camry?
If the red SOS LED remains illuminated after the bulb check, it's likely due to the DCM firmware issue. Your Toyota dealer can perform a DCM reset and firmware update to resolve this and restore proper functionality to the emergency call system.
Will a DCM firmware update fix my 12V battery drain issue?
Yes, a depleted 12V vehicle battery when the ignition is off is listed as one of the potential symptoms related to the DCM firmware issue. The DCM reset and firmware update procedure outlined in TSB 10186193 is intended to address this as well.

Other revisions of this TSB

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