2018-2023 Wrangler & 2020 Gladiator Telematics Module: Fixing SOS & Uconnect Errors

Symptoms of a Failing Telematics Module

A failing Telematics Interface Module in a 2018-2023 Jeep Wrangler or 2020 Jeep Gladiator typically makes itself known through very specific and persistent warning messages on the dashboard and radio screen. Since this module is tied to safety systems, the vehicle will clearly alert you to a problem.

• "Uconnect box error, see dealer" Message: This is one of the most common messages to appear on the infotainment screen at startup.
• "Connected services requires service" Message: Another frequent pop-up on the Uconnect display.
• Red Lights on Overhead Console: The lights on the SOS and ASSIST buttons near the rearview mirror will illuminate and stay solid red. Normally, these lights are off or briefly green.
• Spontaneous SOS Calls: In some cases of hardware failure, the system may erroneously trigger an emergency call, sometimes every time a door is opened.
• Non-Functional Remote Features: The Jeep mobile app will fail to communicate with the vehicle, making remote start, lock, and unlock commands inoperative.
• Flashing Odometer: While not a direct symptom of the telematics module itself, a flashing odometer after a module has been replaced is a classic sign that the mandatory Proxi Alignment procedure was not performed.

Associated OBD-II Codes

While many symptoms appear on the screen without a check engine light, a professional scan tool can pull specific Body (B) and Network (U) codes related to this module. The most common are:

• B1E21-96: Backup Battery Component Internal Failure. This code specifically points to the failure of the small, internal lithium-ion battery inside the telematics module.
• U0142: Lost Communication with Body Control Module "B". This is a general network code indicating the module is not communicating correctly with the rest of the vehicle's systems.

Known Issues, TSBs, and Recalls

While there are no direct recalls for widespread failure of the Telematics Interface Module itself on these specific models, its function is tied to other service campaigns.

• Software Update TSBs: Jeep has issued several Technical Service Bulletins (TSBs) that involve reprogramming the Telematics Box Module (TBM) with updated software. These updates can resolve issues like unresponsive remote commands from the mobile app or incorrect service messages.
• Recall 25V710 (2023-2025 Wrangler 4xe): A recall was issued for some plug-in hybrid models where a Firmware-Over-The-Air (FOTA) update caused a communication breakdown between the Telematics Box Module (TBM) and the Hybrid Control Processor (HCP). This could lead to the HCP resetting while driving, causing a loss of motive power. This highlights the module's deep integration into critical vehicle functions, though the fault was in the software, not the module hardware itself.

Replacement and Programming Requirements

Replacing the Telematics Interface Module is not a simple plug-and-play repair. It requires a specific programming step to make the new module work with your vehicle.

Step 1: Locating the Module

The physical location of the module depends on the vehicle's original radio option. This is the most important factor in determining the difficulty of the repair.

• For vehicles with the standard 7-inch Uconnect system: The Telematics Interface Module is typically a separate, standalone black box. It is located under the driver's side dashboard, mounted to a bracket near the steering column and above the OBD-II port. Access involves removing the lower dash panel, which is held in by clips.
• For vehicles with the premium 8.4-inch Uconnect system: The telematics functions are often integrated directly into the main radio head unit. In this case, there is no separate module to replace. If the telematics portion fails, the entire head unit may need to be repaired or replaced, which is a much more involved and expensive job requiring removal of the center dash stack.

Step 2: Proxi Alignment (Mandatory Programming)

After a new or used Telematics Interface Module is installed, it must be introduced to the vehicle's network using a procedure called a Proxi Alignment (also spelled Proxy Configuration).

The Proxi Alignment synchronizes the new module with the Body Control Module (BCM), which acts as the master list of all installed components on the vehicle. If this step is skipped, the vehicle will not recognize the new module, resulting in a flashing odometer and the module not functioning.

How to Perform a Proxi Alignment:

1. Dealer Tool: A Jeep dealership can perform the Proxi Alignment using their proprietary wiTECH diagnostic software. This is the most straightforward option but will involve a labor charge.
2. DIY Tools (Advanced): Tech-savvy owners and independent shops can perform the procedure using third-party software like AlfaOBD or JScan. This requires three components: a compatible OBD2 interface (like the OBDLink MX+), a Security Gateway (SGW) Bypass Module (required for all 2018+ models), and the software itself running on a laptop or Android device. The SGW bypass temporarily disconnects the factory security module to allow the diagnostic software to make configuration changes.

Buying a Used Telematics Interface Module

Given the high cost of new electronics, a used OEM module is a cost-effective and reliable option. Unlike many mechanical parts, there are no wear items to worry about, but there are critical details to verify.

• Verify the Part Number: Match the part number from your original module exactly. While some part numbers supersede others, matching is the safest way to ensure compatibility. The initial data for this guide lists several valid OEM part numbers: 68379839AA, 68379839AB, 68436273AJ, and 68646092AA. Note that 68436273AJ is superseded by 68646092AA.
• Physical Inspection: When inspecting a used module, check for any signs of water intrusion, corrosion on the pins, or physical damage to the case or connectors. Any of these are red flags.
• Source Vehicle Information: If possible, get the VIN of the vehicle the part came from. This can sometimes help in verifying compatibility, though the part number is the most important factor.
• Why Used OEM is a Good Choice: There are no reputable aftermarket versions of this module. A used OEM part was designed and built by Mopar for your Jeep. It will have the correct hardware and firmware base to integrate properly after a Proxi Alignment. Cheap knock-offs do not exist for this type of complex communication module.

Cost of Replacement

The cost to fix a telematics issue can vary significantly based on the root cause and the parts required.

Note: Labor costs are estimates and will vary by location and shop. If your module is integrated into the 8.4-inch radio, replacement costs will be significantly higher.

Frequently Asked Questions (FAQ)