Q21-1077-2-103 | Genuine Paccar® Chassis Control Module MUX3

1. Enhance vehicle stability

• Helps keep the vehicle balanced during turns, braking, and acceleration.

• Reduces skidding, slipping, and loss of control.

2. Improve handling and driving comfort

• Adjusts suspension and steering to provide a smoother, more controlled ride.

• Adapts to different road conditions automatically.

3. Coordinate safety systems

• Works with ABS, traction control, and stability control to prevent accidents.

• Ensures all systems respond correctly in emergency situations.

4. Monitor vehicle dynamics

• Tracks wheel speed, steering angle, yaw rate, and body motion.

• Uses this data to make real-time adjustments to keep the vehicle stable.

5. Provide a safer driving experience

• Helps reduce rollovers, wheel slip, and uncontrolled braking or swerving.

• Assists the driver during sharp maneuvers or slippery conditions.

1. Warning lights on the dashboard

• ABS light

• Traction control light (TCS)

• Stability control light (ESC)

• Suspension warning
  These lights often appear together when the CCM fails.

2. Poor or unstable handling

• Vehicle feels unsteady when turning

• Increased body roll

• Vehicle sways or “floats” over bumps

3. Traction control or ABS not working

• Wheels may lock up during braking

• Loss of traction on slippery roads

• Driver-assist features may be disabled

4. Harsh or inconsistent suspension behavior

• Suspension may feel too stiff, too soft, or uneven

• Ride comfort suddenly worsens

5. Steering issues

• Steering may feel heavy, delayed, or overly sensitive

• Stability control may not engage during sharp turns

6. Reduced stability

• Vehicle may fishtail, slide, or lose control more easily

• Yaw and pitch control systems may stop responding

7. Error messages

• “Chassis control system fault”

• “Stability control unavailable”

• “Traction control off” (without pressing the button)

8. Inconsistent braking behavior

• Brakes may pulse unexpectedly

• Longer stopping distances

• Brake force may shift unevenly

9. Diagnostic trouble codes (DTCs)

• A scan tool may show chassis system or communication errors (CAN bus faults).