2024-2025 Jeep Wrangler B2779-04 QVPM Sound Not OK

Symptoms

Owners of 2024-2025 Jeep Wrangler and Gladiator vehicles may experience issues with the pedestrian alert system. The primary symptom is a "Quiet Vehicle Pedestrian Module (QVPM) Sound Is Not OK," or the QVPM may be completely "inoperative."

Fault Codes / DTCs

The specific diagnostic trouble code associated with this issue is:

• B2779-04: Vehicle Pedestrian Alert Module-System Internal Failures.

This DTC indicates that the Body Control Module (BCM) has received a LIN Bus message signaling an internal fault within the Pedestrian Alert Speaker Module.

Diagnosis / Trigger Conditions

The B2779-04 DTC is continuously monitored when the ignition is on and the battery voltage is between 10.0 and 16.0 volts. The code sets when the Body Control Module (BCM) detects an internal fault within the Pedestrian Alert Speaker Module via the LIN Bus communication.

Repair Procedure Summary

Before replacing the Vehicle Pedestrian Alert Module or the Pedestrian Alert Speaker Module, technicians are advised to perform specific diagnostic steps. The process begins with a BODY VERIFICATION TEST, as detailed in the 28 - DTC-Based Diagnostics/MODULE, Body Control (BCM) - Standard Procedure. If wiring issues are suspected, especially concerning bus communications, technicians should consult the Group 29- Non -DTC Diagnostics Communication Diagnostic Procedure.

Part return analysis has shown that many returned parts have no actual failures, emphasizing the importance of thorough diagnosis. Technicians must always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Key diagnostic steps include:

1. Using a scan tool to read and record all Body Control Module (BCM) DTCs.
2. Recording environmental data associated with the DTCs.
3. Erasing the DTCs from the system.
4. Operating the vehicle under the conditions that originally set the DTC, using the recorded environmental data and the 'When Monitored and Set Conditions' information.
5. Re-reading the BCM DTCs to confirm the issue.

This systematic approach helps ensure that the correct component is identified and addressed, preventing unnecessary parts replacement for the Jeep Wrangler B2779-04 issue.

Important Warnings

This document, identified as TSB S2523000049, serves as a record of past experiences and does not authorize warranty repairs. It does not provide definitive conclusions about vehicle malfunctions. Instead, it compiles known cases related to the symptom or condition. The manufacturer emphasizes that the technician is the expert responsible for determining the appropriate course of action.

Owner Action

If your 2024-2025 Jeep Wrangler or Gladiator is experiencing a quiet or inoperative Quiet Vehicle Pedestrian Module (QVPM) sound, or if you suspect a B2779-04 DTC, it is recommended to visit an authorized Jeep dealership. Their trained technicians have access to the specific diagnostic procedures and tools required to accurately diagnose and address this issue.

NHTSA ID: 11018600