68145835AE | Genuine Mopar® Anti-Lock Brake System Module

• Jeep Wrangler (JK): 2012 – 2014

• Jeep Wrangler Unlimited (JK 4-Door): 2012 – 2014

• (Fits various trims including Sport, Sahara, Rubicon, Unlimited, and Special Editions equipped with standard hydraulic braking and Electronic Stability Control).

1. What is it?

The module serves as the central electronic computer ("brain") for your Jeep's braking and chassis control systems. Mounted directly to the hydraulic brake valve block under the hood, it processes data from wheel speed sensors, steering angle sensors, and yaw/g-sensors to regulate hydraulic fluid pressure to individual wheels.

2. Safety & Off-Road Systems Controlled

This module governs the entire suite of dynamic safety features on the Jeep Wrangler:

• Anti-Lock Braking System (ABS): Prevents wheels from locking up during sudden emergency stops or hard braking on loose surfaces.

• Electronic Stability Control (ESC) & Traction Control: Detects skid or loss of traction and applies selective braking to individual wheels to maintain vehicle trajectory.

• Hill Start Assist (HSA) & Hill Descent Control (HDC): Holds line pressure on inclines to prevent rollback and manages controlled downhill speeds on off-road trails.

• Electronic Roll Mitigation (ERM): Anticipates potential vehicle rollover conditions and intervenes using wheel-specific braking.

1. Multiple Warning Lights on the Dashboard

The most immediate sign of a failing ABS control module is an array of warning lights on the gauge cluster (often called the "Christmas tree" effect):

• ABS Warning Light: Stays continuously illuminated.

• Traction Control / ESC Light: Slippery car icon remains lit.

• Brake System Warning Light: Red brake warning light stays on.

• Cluster Messages: Text warnings such as "Service Anti-Lock Brake System" or "Service Electronic Stability Control".

2. Diagnostic Trouble Codes (DTCs)

A professional diagnostic scan tool connected to the ABS module or Powertrain Control Module (PCM) will typically return specific DTCs:

• C2116: ABS Pump Motor Low Voltage (a common internal board failure on Wrangler JK modules).

• C2200: Anti-Lock Brake Module Internal / Electronic Fault.

• U0121: Lost Communication with Anti-Lock Brake System (ABS) Control Module.

• C0031 / C0034 / C0037 / C003A: Wheel speed sensor circuit fault codes (often caused by cracked internal solder joints falsely reporting sensor failures).

3. Deactivation of Driver Assist & Safety Systems

When the module detects an internal error, it disables dynamic electronic features for safety, returning the vehicle to manual hydraulic braking only:

• Hill Start Assist (HSA) & Hill Descent Control (HDC): Completely disabled.

• Electronic Roll Mitigation (ERM) & Electronic Stability Control (ESC): Non-functional.

• Anti-Lock Braking (ABS): Inoperative during hard or panic stops, causing wheels to lock up and skid on slippery surfaces or loose terrain.

4. Continuously Running ABS Pump (Battery Drain)

A short-circuited transistor or relay on the internal circuit board can keep constant power supplied to the ABS pump motor. The pump will continuously run or buzz even with the ignition off and key removed, resulting in a drained battery overnight.

5. Spongy Brake Pedal or Erratic Pedal Pulsation

If internal solenoid valves inside the module/hydraulic unit fail to hold pressure correctly, the brake pedal may feel soft or "spongy." Alternatively, you may experience unexpected pedal pulsation during gentle braking on dry pavement.