68046388AA | Genuine Mopar® Anti-Lock Brake Control Unit

1. Prevent wheel lock-up

The control unit constantly monitors wheel speeds.
If a wheel is about to lock when you brake hard, the unit quickly reduces and reapplies brake pressure to keep that wheel spinning slightly.

This helps prevent skidding.

2. Maintain steering control

When wheels lock, you can’t steer.
By preventing lock-up, the ABS control unit lets the driver turn the wheel and avoid obstacles even while braking hard.

3. Improve vehicle stability and control

The unit keeps the vehicle from sliding uncontrollably, especially on:

• Wet roads

• Ice or snow

• Gravel or dirt

• Sudden stops

This greatly improves safety.

4. Shorten stopping distance in many situations

By managing brake pressure precisely and rapidly, the ABS control unit helps the vehicle stop more efficiently while maintaining traction.

5. Run self-diagnostics and trigger ABS warning light

The control unit constantly checks:

• Wheel speed sensors

• Hydraulic modulator

• Internal circuitry

If something fails, it turns on the ABS warning light to alert the driver.

6. Work with other safety systems

The ABS control unit often shares data with:

• Traction control (TCS)

• Electronic stability control (ESC)

• Brake assist

• Hill-start assist

It’s a key part of the vehicle’s safety network.

1. ABS Warning Light Stays On

The most obvious sign.
If the ABS module detects a problem, it turns on the ABS light and sometimes the Traction Control or Stability Control light too.

2. ABS Doesn’t Activate

During hard braking:

• No pedal pulsation

• No buzzing or rapid vibration

• Wheels may lock up
  This means the ABS system is not working.

3. Brakes Lock Up Easily

If the control unit fails, the system cannot modulate brake pressure.
You may skid or lose steering control on slippery surfaces.

4. Unresponsive or Weak Brake Pedal

The pedal may feel:

• Hard and stiff

• Soft and spongy

• Slower to respond
  This can happen when the module fails internally or sends incorrect signals to the hydraulic pump.

5. Traction Control or Stability Control Lights On

Since these systems share wheel-speed data with the ABS, a bad module can cause TCS/ESC lights to turn on as well.

6. Speedometer Problems (in some cars)

If the ABS module also handles wheel speed data, you may see:

• Speedometer jumping

• Speed not displaying correctly

7. Pulsing or Jerky Brakes in Normal Driving

If the module malfunctions, it may activate ABS when you’re not braking hard, causing:

• Random pedal pulsing

• Grinding or buzzing noises

• Brake pressure changing unexpectedly

8. Diagnostic Trouble Codes (DTCs)

A scan tool might show ABS-related error codes like:

• Module communication failure

• Sensor circuit failure

• Pump or valve errors