28.5261-1604.3 | Genuine Mopar® Anti-Lock Brake Control Module

An Anti-Lock Brake Control Module 28.5261-1604.3 (also called ABS Control Module, ABS Module, or ABS ECU) is the computer that controls the anti-lock braking system in a vehicle. It is the main electronic part that decides when and how the ABS should activate to keep the wheels from locking during braking.

General Specifications

Fitment

Fitment can vary by engine build and options. Match the part number on the part you are replacing, or contact us with your vehicle details before ordering.

Purpose & Function

1. Prevent Wheel Lock-Up

The module monitors wheel speeds and prevents them from locking when you brake hard.
This helps avoid:

• Skidding

• Sliding

• Loss of control

2. Maintain Steering Control While Braking

• If wheels lock, you cannot steer.
• The ABS Control Module keeps the wheels rotating just enough so you can turn the vehicle while braking.

3. Improve Vehicle Stability

By rapidly adjusting brake pressure, the module helps the vehicle stay balanced and prevents sideways sliding, especially on:

• Wet roads

• Ice or snow

• Gravel or dirt

• Abrupt stops

4. Control the ABS Pump and Valves

The module commands the hydraulic unit to:

• Reduce brake pressure

• Reapply pressure

• Pulse the brakes many times per second

This happens automatically and much faster than a human could do.

5. Run Diagnostic Checks

The module constantly checks:

• Wheel speed sensors

• ABS pump

• Hydraulic valves

• Internal circuits

If it detects a problem, it turns on the ABS warning light.

6. Work With Other Safety Systems

The ABS Control Module often shares data and works together with:

• Traction Control System (TCS)

• Electronic Stability Control (ESC/ESP)

• Brake Assist

• Hill-Start Assist systems

These systems rely on the module to help keep the vehicle safe.

Signs of Bad Anti-Lock Brake Control Module

1. ABS Warning Light Stays On

• The dashboard ABS light (sometimes with traction control light) turns on and stays on.

• Indicates the module has detected a problem or lost communication with sensors.

2. ABS Doesn’t Activate

• During hard braking, the pedal doesn’t pulse.

• You may hear no ABS pump noise.

• Wheels can lock up, especially on slippery surfaces.

3. Brakes Lock Up or Skid

• Without proper control from the module, the ABS cannot modulate brake pressure.

• Wheels may lock during braking, increasing the risk of losing steering control.

4. Brake Pedal Problems

• Pedal may feel hard, soft, or spongy.

• Brakes may respond inconsistently.

5. Traction Control or Stability Control Lights On

• Systems like TCS or ESC often rely on the ABS module.

• A failing module can trigger multiple warning lights.

6. Erratic ABS Behavior

• ABS may engage randomly without heavy braking.

• Pulsing or vibration in the brake pedal at normal speeds.

• Strange buzzing or grinding noises from the brake system.

7. Speedometer or Wheel Data Issues (in some vehicles)

• If the module provides wheel speed data, you may see speedometer jumping or inaccurate readings.

8. Diagnostic Trouble Codes (DTCs)

• Scan tools may show ABS module-related errors:

  • Communication failures

  • Sensor circuit failures

  • Pump or valve errors

About Mopar

Mopar is the official parts, service, and customer care brand for Chrysler, Dodge, Jeep, Ram, and Fiat vehicles. Originally short for “Motor Parts”, Mopar was established in 1937 and is now a global brand under Stellantis.

Mopar supplies genuine OEM parts, accessories, and performance upgrades, and it supports dealerships and technicians with tools, diagnostics, and factory-backed service. Known especially among enthusiasts for its muscle car heritage, Mopar is also a major presence in motorsports and custom vehicle culture.