2024 Jeep Wrangler IDCM Software Update TSB 08-004-25

Symptoms of IDCM Software Issues

Owners of affected 2024 Jeep Wrangler models may experience one or more of the following critical symptoms related to the Integrated Dual Charging Module (IDCM) software:

• "Vehicle will not start and needs to be jump started as 12v battery drained."
• "Vehicle will not charge."

These issues indicate a problem with the vehicle's electrical system and its ability to maintain the 12V battery or properly charge the high-voltage system.

Cause of the Problem

The root cause of these symptoms in the 2024 Jeep Wrangler is identified as faulty software within the Integrated Dual Charging Module (IDCM). This software issue prevents the IDCM from functioning correctly, leading to the observed charging and starting difficulties.

Important Warnings for Technicians and Owners

This Technical Service Bulletin includes several critical warnings to ensure safety during the repair process, especially concerning the high-voltage system:

• High Voltage Safety: Before performing any software reprogramming, it is essential to make the vehicle safe. When repairs involve or imply contact with live high voltage components, the technician must ensure the power supply of the high-voltage system is disconnected throughout the operation.
• Qualified Personnel: Only specifically trained technicians qualified to perform repairs on vehicles with high voltage systems under current national laws and regulations are authorized to work on the vehicle.
• Diagnostic Safety: Before performing any diagnostic repair work, technicians must carefully read and comply with general instructions for working safely on hybrid/electric vehicles, using suitable general equipment and Personal Protective Equipment (PPE).
• Battery Charger: A battery charger must be installed to maintain a 12 volt system voltage during the repair procedure.
• Flash Interruption: If the flash process is interrupted or aborted, the flash should be restarted.

Diagnosis

To diagnose the 2024 Jeep Wrangler IDCM software issue, technicians use a Scan Tool (wiTECH) along with Diagnostic Procedures available in DealerCONNECT/Service Library. They verify all related systems are functioning as designed. If Diagnostic Trouble Codes (DTCs) or other symptom conditions (beyond those listed above) are present, these must be recorded and repaired before proceeding with the bulletin. The bulletin also notes that if a customer's VIN is listed in VIP or the RSU VIN list, the repair should be performed. If a vehicle not on the VIN list exhibits any of the listed symptoms, the Repair Procedure should still be followed.

Repair Procedure Summary

This bulletin, TSB 08-004-25, outlines a procedure to resolve the 2024 Jeep Wrangler IDCM software issue by reprogramming the Integrated Dual Charging Module. The process involves several key steps:

1. VIN Verification: Confirm if the vehicle is on the Rapid Service Update (RSU) VIN list. If not, further diagnostics are needed.
2. Software Check: Determine if the IDCM is already updated to the latest software. If it is, the bulletin does not apply, and an inspection labor operation (18-90-16-9E) is used.
3. Disable HV Battery Contactors: Using the wiTECH tool, disable the High Voltage (HV) Battery Contactors via the Misc Functions tab.
4. Confirm Contactor Status: Use wiTECH to confirm the contactors are open and wait five minutes. If they do not open, cycle the ignition.
5. Reprogram IDCM: Reprogram the IDCM with the latest software using the wiTECH Diagnostic Application. If issues arise during flashing, a helpdesk ticket should be submitted.
6. Clear DTCs: Clear all Diagnostic Trouble Codes (DTCs) that may have been set in any module due to the reprogramming process.
7. Enable HV Battery Contactors: Re-enable the HV Battery Contactors using wiTECH.
8. Verify Charging: Confirm that the vehicle charges properly after the software flash.

If the vehicle does not charge properly after the software flash, the IDCM may need to be replaced under warranty. New IDCMs come pre-programmed with the latest software.

Required Tools

The primary tool required for this repair is a wiTECH or Equivalent scan tool, which is used for diagnosis, disabling/enabling HV battery contactors, and reprogramming the IDCM.

Labor Operations and Failure Codes

For claims data, specific labor operations and failure codes are used:

• Labor Operation No. 18-90-16-9E: Module, Integrated Dual Charging Module (IDCM) - Inspect. This has a labor time of 0.2 hours.
• Labor Operation No. 18-90-16-9F: Module, Integrated Dual Charging Module (IDCM) - Inspect and Reprogram, Includes HV Battery Contactor Routine. This has a labor time of 0.4 hours.

Technicians must choose the appropriate failure code based on whether it's an RSU or TSB. The "RF" (Required Flash) failure code is for essential module flash/reprogramming and requires VIN confirmation on the RSU list. The "CC" (Customer Concern) failure code is used when the customer's concern matches the symptoms identified in the TSB.

Owner Action

If you own a 2024 Jeep Wrangler and are experiencing symptoms such as your vehicle not starting, a drained 12V battery, or issues with charging, it is recommended to contact your authorized Jeep dealership. Reference Technical Service Bulletin (TSB) 08-004-25 or Rapid Service Update (RSU) 25-002. The repair, which involves updating the 2024 Jeep Wrangler IDCM software, is reimbursable within the provisions of your vehicle's warranty.

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Source: NHTSA ID: 11012844