2023-2024 Alfa Romeo Tonale/Dodge Hornet BCM DTC U0423-87

This manufacturer communication, NHTSA ID 10243158, highlights a specific diagnostic concern affecting the Body Control Module (BCM) in certain 2023-2024 Alfa Romeo Tonale and Dodge Hornet vehicles. The issue is identified by Diagnostic Trouble Code (DTC) U0423-87, which points to a problem with data communication from the Telematic Box Module (TBM).

Symptoms

While the manufacturer communication primarily focuses on the diagnostic code, owners of affected 2023-2024 Alfa Romeo Tonale and Dodge Hornet vehicles might experience various symptoms related to the Body Control Module or telematics system. These could include intermittent issues with vehicle connectivity features, unexpected warning lights on the instrument cluster, or malfunctions in systems controlled by the BCM that rely on communication with the Telematic Box Module.

Fault Codes / DTCs

The core of this manufacturer communication is the specific Diagnostic Trouble Code (DTC) that technicians may find during diagnosis:

• U0423-87: Invalid Data Received from TBM (Telematic Box Module) - Missing Message Erroneously

This code indicates that the Body Control Module (BCM) is not receiving expected or valid data messages from the Telematic Box Module (TBM) as it should. This missing or erroneous data can affect the proper operation of various vehicle systems.

Diagnosis / Trigger Conditions

The DTC U0423-87 is set when the Body Control Module (BCM) detects that it is receiving invalid data or is missing expected messages from the Telematic Box Module (TBM). This condition is described as "Invalid Data Received from TBM (Telematic Box Module) - Missing Message Erroneously." Technicians will typically use diagnostic scan tools to confirm the presence of this DTC and investigate the communication network between the BCM and TBM to pinpoint the root cause of the data discrepancy. The 2024 Alfa Romeo Tonale manufacturer_communication provides guidance for addressing this specific fault.

Repair Procedure Summary

Since this is a manufacturer communication regarding a diagnostic trouble code, the repair typically involves a diagnostic process at an authorized dealership. Technicians will likely perform a thorough inspection of the Body Control Module (BCM) and Telematic Box Module (TBM), including their connections and software. The resolution may involve software updates for one or both modules, or in some cases, the replacement of a faulty module if diagnostics confirm a hardware issue. Specific repair steps are detailed in the full technical service bulletin.

Owner Action

If you own a 2023-2024 Alfa Romeo Tonale or Dodge Hornet and suspect an issue related to your vehicle's Body Control Module or telematics system, especially if you experience any unusual warning lights or system malfunctions, it is recommended to schedule an appointment with an authorized Alfa Romeo or Dodge dealership. They have the necessary diagnostic tools and access to the latest manufacturer communications, like NHTSA ID 10243158, to accurately diagnose and resolve the DTC U0423-87 condition.

Source: NHTSA ID: 10243158