CarProblems
Service Bulletin

2021 Toyota Camry DCM Issues and DTC B15A804

Toyota has released TSB 10187239 addressing various Digital Communication Module (DCM) related issues, including Diagnostic Trouble Code (DTC) B15A804, in certain 2021 Toyota Camry vehicles. Symptoms range from an inoperative Toyota App to a red SOS LED staying on.

ByAhmet Topcu — Founder & Editor-in-Chief2021 Toyota Camry
2021 TOYOTA Camry — Toyota Camry B15A804
Editorial illustration generated for this article.
B15A80410187239Red SOS LED stays on after bulb checkToyota App is inoperativeToyota App shows an error 42Unable to subscribe to remote servicesDepleted 12V vehicle battery when in IG-OFFDigital Communication Module resetDCM firmware updateToyota Camry B15A804

Also applies to

Toyota Avalon
2021
Toyota Corolla
2021
Toyota RAV4
2021

Owners of some 2021 Toyota Camry vehicles may encounter a range of issues related to the Digital Communication Module (DCM), often accompanied by Diagnostic Trouble Code (DTC) B15A804. These problems can affect the vehicle's connectivity features and even battery health. Toyota has issued TSB 10187239 to provide a solution for these conditions.

Symptoms

Owners of affected 2021 Toyota Camry vehicles may observe one or more of the following conditions:

  • The Diagnostic Trouble Code (DTC) B15A804 is present in current or history.
  • The red SOS LED remains illuminated after the bulb check.
  • The Toyota App is inoperative or shows an "error 42" when attempting to execute a command.
  • The Toyota App does not accept the activation code.
  • The SOS call center does not receive the vehicle's location in a timely manner.
  • The vehicle is unable to remote start with the key fob (if equipped).
  • The vehicle is unable to subscribe to remote services.
  • The vehicle is unable to activate Wi-Fi.
  • Destination Assist is inoperative.
  • A depleted 12V vehicle battery when the ignition is off (IG-OFF).

These symptoms, including the presence of the Toyota Camry B15A804 DTC, indicate an underlying issue with the Digital Communication Module.

Fault Codes / DTCs

The primary Diagnostic Trouble Code associated with these issues is:

Code Description Module
B15A804 DCM Communication Module Malfunction DCM

Diagnosis / Trigger Conditions

The presence of DTC B15A804, along with the described communication and battery-related symptoms, points to a malfunction within the Digital Communication Module (DCM). This can manifest as connectivity failures with the Toyota App and other remote services, as well as an inability to properly manage the vehicle's 12V battery when the ignition is off. These conditions are specifically addressed by the DCM reset and firmware update.

Repair Procedure Summary

The recommended repair for the Toyota Camry B15A804 DTC and associated symptoms involves a Digital Communication Module (DCM) reset and a firmware update. This procedure is designed to correct software-related anomalies within the DCM that lead to the observed malfunctions. Technicians will follow a specific DCM Reset and Firmware Update Procedure outlined in the bulletin to ensure the module is properly updated.

Owner Action

If you own a 2021 Toyota Camry and are experiencing any of the symptoms listed, such as an inoperative Toyota App or a persistent red SOS LED, you should contact your authorized Toyota dealership. The DCM reset and firmware update procedure is available to address these conditions. This update is typically performed under warranty if your vehicle meets the eligibility criteria.

NHTSA ID: 10187239

Frequently Asked Questions

What does DTC B15A804 mean for my 2021 Toyota Camry?
DTC B15A804 indicates a malfunction within your vehicle's Digital Communication Module (DCM). This can lead to issues with your Toyota App, remote services, SOS features, and potentially a drained 12V battery.
How can I fix the 'Toyota App is inoperative' issue in my 2021 Toyota Camry?
If your Toyota App is inoperative or showing an 'error 42' in your 2021 Toyota Camry, the solution is typically a Digital Communication Module (DCM) reset and firmware update, as outlined in Toyota TSB 10187239. You should schedule an appointment with your Toyota dealer for this service.
Is the DCM firmware update for the Toyota Camry B15A804 covered under warranty?
Yes, the Digital Communication Module (DCM) reset and firmware update to address DTC B15A804 and related issues in your 2021 Toyota Camry is generally covered under the vehicle's factory warranty. It's best to confirm with your local Toyota dealership.
What other Toyota models are affected by these DCM issues?
While this particular document focuses on the 2021 Toyota Camry, the TSB indicates that similar DCM issues, including DTC B15A804, can affect certain 2021 Toyota Corolla, Avalon, and RAV4 models, as well as some 2020 model year vehicles across various Toyota lines.

Other revisions of this TSB

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