2026 Jeep Wrangler DASM Software Update TSB

This Technical Service Bulletin (TSB) 08-331-25, also released as Rapid Service Update (RSU) 25-209, addresses software-related issues within the Driver Assistant System Module (DASM) in certain 2026 Jeep Wrangler vehicles. Owners may notice a Malfunction Indicator Lamp (MIL) illumination, specific warning messages, or a loss of advanced driver-assistance features. This 2026 Jeep Wrangler DASM update aims to correct these problems by reprogramming the module with the latest software.

Symptoms

Owners of affected 2026 Jeep Wrangler vehicles may experience one or more of the following indicators:

• The Malfunction Indicator Lamp (MIL) illuminates on the dashboard.
• The instrument panel cluster displays the message: "Service Adaptive Cruise Control".
• Advanced Driver Assistance System (ADAS) features become unavailable. This includes systems such as Adaptive Cruise Control (ACC), Advanced Emergency Braking (AEB), and Forward Collision Warning (FCW).

Fault Codes / DTCs

When these symptoms occur, a Diagnostic Trouble Code (DTC) will be set in the vehicle's system:

• C2206-00: "Vehicle Configuration Mismatch"

Diagnosis

To diagnose this issue, technicians will use a Scan Tool (wiTECH) in conjunction with the diagnostic procedures available through DealerCONNECT/Service Library. The process involves verifying that all related systems are functioning as intended.

If any DTCs or symptom conditions other than those listed in this bulletin are present, they should be recorded and addressed before proceeding with the TSB's repair steps. The primary focus for this 2026 Jeep Wrangler DASM update is the C2206-00 code and associated symptoms.

Repair Procedure Summary

The repair for this issue involves inspecting and reprogramming the Driver Assistant System Module (DASM) with the latest available software. Here's a summary of the steps a technician will follow:

1. Preparation: Install a battery charger to maintain voltage between 13.2 and 13.5 volts throughout the flash process. This prevents power fluctuations that could interrupt the update.
2. VIN Verification: The technician will check if the vehicle's VIN is included in the Rapid Service Update (RSU) VIN list.
3. DASM Version Check: Determine if the DASM already has the latest software version.
4. Reprogramming: If an update is needed, the DASM will be reprogrammed using the wiTECH Diagnostic Application with the most current software. If any issues arise during this process, a support ticket will be submitted to the helpdesk.
5. DTC Clearing: After successful reprogramming, any Diagnostic Trouble Codes (DTCs) that may have been set in various modules due to the reprogramming process will be automatically presented and cleared using the wiTECH application.

Important Warnings

• Battery Voltage: During the reprogramming process, a battery charger must be installed to ensure the battery voltage does not drop below 13.2 volts. The charging voltage must not exceed 13.5 volts.
• Interrupted Flash: If the flash process is interrupted or aborted for any reason, it should be restarted from the beginning.
• SA Market Specific: For vehicles in the South America (SA) market only, it is not necessary to send DID-1 or DID-A after applying this TSB.

Owner Action

If your 2026 Jeep Wrangler is experiencing the symptoms described, such as the Malfunction Indicator Lamp (MIL) illumination, the "Service Adaptive Cruise Control" message, or unavailable ADAS features like ACC, AEB, or FCW, you should contact your authorized Jeep dealership. This repair is reimbursable under the provisions of your vehicle's warranty. The dealership will verify if your vehicle is covered by TSB 08-331-25 or RSU 25-209 and perform the necessary 2026 Jeep Wrangler DASM update.

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Source: NHTSA ID: 11024053