2021 Jeep Wrangler RFHM Update Prevents Key Fob Theft

Owners of the 2021 Jeep Wrangler may be concerned about vehicle theft due to the potential for unauthorized key fobs to be programmed through the Radio Frequency Hub Module (RFHM). To address this, Stellantis has released Technical Service Bulletin (TSB) 08-229-25, which details a crucial software enhancement for the RFHM. This bulletin applies to vehicles in North and South America, Enlarged Europe, China, India & Asia Pacific, Middle East & Africa markets.

This TSB aims to prevent unauthorized key fob programming, thereby deterring an unwanted drive-off of the vehicle without the customer's knowledge. The Jeep Wrangler RFHM update is a proactive measure to bolster vehicle security.

Symptoms

The primary symptom addressed by this TSB is the concern among customers regarding vehicle theft. This concern arises from the ability of key fobs to be programmed through the RFHM by unauthorized individuals. The software enhancement directly targets this vulnerability.

Cause

The root cause of this security vulnerability is identified as the existing RFHM software. The original software allowed for a pathway that could potentially be exploited for unauthorized key fob programming.

Diagnosis Details

To diagnose if your 2021 Jeep Wrangler requires this update, a technician will use a Scan Tool, specifically the wiTECH system. They will utilize the appropriate Diagnostic Procedures available in DealerCONNECT/Service Library to verify that all related systems are functioning as designed. If Diagnostic Trouble Codes (DTCs) or other symptom conditions, beyond those listed in the bulletin, are present, these issues must be recorded on the repair order and addressed as necessary before proceeding with the RFHM update. If the customer's concern matches the symptom described in TSB 08-229-25, the repair procedure should be initiated.

Repair Procedure Steps

The repair involves updating the RFHM module with the latest available software. This process is straightforward but requires specific steps to ensure successful completion:

1. Battery Management: A battery charger must be installed to ensure the vehicle's battery voltage does not drop below 13.2 volts during the flash process. It is crucial not to allow the charging voltage to climb above 13.5 volts.
2. RFHM Reprogramming: The RFHM is reprogrammed using the wiTECH Diagnostic Application with the latest available software. If any issues arise during the flashing process, a ticket should be submitted to the Helpdesk, accessible via the Help menu within wiTECH.
3. Finalization: After successful reprogramming, the vehicle's ignition must be turned to the run position (engine off) for five seconds. Subsequently, all Diagnostic Trouble Codes (DTCs) are cleared. The wiTECH application will automatically present all DTCs after the flash and allow them to be cleared.

Important Notes for Owners and Technicians

Owners and technicians should be aware of critical steps and warnings during the Jeep Wrangler RFHM update:

• Battery Voltage: It is essential to install a battery charger to maintain battery voltage between 13.2 and 13.5 volts during the flash process. Do not allow the voltage to drop below 13.2 volts or climb above 13.5 volts.
• Interrupted Flash: If the flash process is interrupted or aborted for any reason, it must be restarted from the beginning.
• SA Market Specific: For the SA (South America) market only, after applying this TSB, it is not necessary to send DID-I or DID-A.

Required Tools

The primary tool required for this service is a Scan Tool, specifically the wiTECH or an equivalent diagnostic system.

Warranty and Claim Information

This service is reimbursable within the provisions of the warranty. Dealers must use the following claims data:

• Labor Operation No: 18-19-12-BE
• Labor Description: Module, Radio Frequency Hub (RFHM) - Reprogram (0 - Introduction)
• Skill Category: 6 - Electrical and Body Systems
• Labor Time: 0.3 Hours
• Failure Code: CC (Customer Concern)

When utilizing failure code CC, the 3C's (customer's concern, cause, and correction) must be provided for processing Technical Service Bulletin flash/reprogramming conditions.

NHTSA ID: 11021555