2021-2024 Jeep Wrangler ABS Module Not Initializing

Understanding the Jeep Wrangler ABS Module Initialization Issue

Owners of 2021-2024 Jeep Wrangler vehicles may encounter a specific problem with the Antilock Brake System (ABS) module. This issue arises when a new MOPAR service replacement ABS module is installed, and it subsequently fails to complete the necessary wiTECH initialization routines. This failure to initialize can impact the vehicle's braking and stability systems, potentially affecting overall safety and performance.

The problem, identified in STAR Online Publication S2405000001, indicates that the ABS module is not properly integrating with the vehicle's systems after being replaced. This can lead to a range of diagnostic trouble codes being stored, signaling various malfunctions within the ABS and related components. Engineering teams are actively investigating this specific condition to determine the root cause and develop a resolution for the Jeep Wrangler ABS module initialization problem.

Symptoms and Associated Diagnostic Trouble Codes (DTCs)

When the ABS module fails to initialize, drivers of affected 2021-2024 Jeep Wrangler models may notice various warning lights on the dashboard related to the braking or stability control systems. While the document does not specify exact dashboard messages, an uninitialized ABS module would typically trigger system warnings. Technicians performing diagnostics will likely find one or more of the following Diagnostic Trouble Codes (DTCs) stored in the vehicle's system:

These codes indicate specific failures such as missing sensor calibrations, internal module errors, incorrect vehicle configuration settings, or the module being stuck in a "plant mode" state. The presence of these DTCs confirms the underlying problem with the Jeep Wrangler ABS module initialization.

Initial Diagnostic Steps for Technicians

For technicians encountering this specific issue, STAR Online Publication S2405000001 outlines initial diagnostic steps. If a vehicle exhibits these conditions, the original ABS module should first be labeled and retained. Technicians are then advised to reinstall the original module and run through any original DTCs that were set.

Further inspection should include thoroughly checking the module's pins to ensure they are not damaged. Additionally, the power, ground, and bus connections to the module must be tested to confirm they pass inspection. These steps help to rule out common installation errors or wiring issues before concluding that the new replacement ABS module is the source of the initialization failure.

Current Status: Engineering Investigation

This communication from Stellantis indicates that if diagnostics and inspections point to the new ABS replacement module as the cause of the DTCs and initialization failures, engineering is actively investigating the problem. The goal of this investigation is to identify why the MOPAR service replacement ABS module is not properly completing wiTECH initialization routines.

An update regarding this issue, including a potential resolution, will be provided via the same STAR Online Publication number, S2405000001. Owners and technicians are encouraged to use the "GET NOTIFIED" feature within the STAR Online Publication system to receive alerts when new information becomes available.

Important Considerations for Owners

It is crucial for owners of 2021-2024 Jeep Wrangler vehicles to understand that this STAR Online Publication is an informational document detailing an ongoing investigation. The document explicitly states: "This document does not authorize warranty repairs." This means that, at present, any diagnostic work or attempted repairs related to this specific uninitialized ABS module issue may not be automatically covered under warranty.

If your Jeep Wrangler is experiencing symptoms related to the ABS module not initializing after a recent replacement, it is recommended to contact your authorized Jeep dealership. Inform them about STAR Online Publication S2405000001 and the specific diagnostic trouble codes you or a previous technician may have identified. While a definitive fix is still under investigation, your dealership can stay informed about updates and advise on the best course of action once a resolution is released.

NHTSA ID: 11008326