68399808AB | Genuine Mopar® Steering Column Module 2018-2025

1. Combine Multiple Steering Wheel Controls Into One Unit

Instead of separate wiring for each switch, the SCM integrates:

• Turn signals

• Wiper/washer controls

• Cruise control buttons

• Audio/phone buttons

• Paddle shifters (if equipped)

• Horn

This reduces wiring complexity and improves reliability.

2. Communicate Driver Commands to the Vehicle

The SCM sends signals through the CAN bus (or similar network) to:

• Body control module (BCM)

• Engine control module (ECM)

• Transmission control

• Safety systems

It ensures fast, accurate communication.

3. Support Modern Safety Features

Many safety systems rely on SCM data, especially the steering angle sensor (often built into the module), including:

• Electronic stability control (ESC)

• Traction control

• Lane-keeping assist

• Collision avoidance systems

4. Manage Airbag Connectivity

The SCM helps maintain electrical contact with the driver’s airbag even while the wheel is turning (often through the clockspring integrated with or connected to the module).

5. Centralize Control for Diagnostics

Because all steering-wheel-related functions run through the SCM, technicians can:

• Read fault codes

• Diagnose issues more easily

• Update software if needed

6. Improve Safety and Driving Comfort

The SCM ensures smooth function of all steering wheel controls, improving:

• Driver convenience

• Vehicle responsiveness

• Safety system accuracy

1. Turn Signals Not Working or Working Intermittently

• Left or right indicators fail, flash rapidly, or turn off by themselves.

• Stalk may feel normal but the SCM isn’t processing the signal.

2. Wipers or Washer System Malfunction

• Wipers don’t turn on or change speed

• Washer pump won’t activate

• Intermittent settings behave unpredictably

3. Steering Wheel Buttons Stop Working

Failure of:

• Cruise control buttons

• Radio/volume controls

• Phone buttons

• Driver-assistance switches

4. Horn Not Working

Even if the horn switch is fine, the signal may not reach the horn relay.

5. Airbag / SRS Warning Light

The SCM (often through the clockspring) carries the signal for the driver’s airbag.
A bad SCM or internal connection failure can trigger:

• “Airbag Fault” light

• SRS system disabled

6. Electronic Stability Control (ESC) or Traction Control Lights

If the SCM’s steering angle sensor fails or sends incorrect data:

• ESC/ESP light turns on

• ABS and traction control may disable

• Vehicle may feel unstable during turns

7. No Communication With Vehicle Modules

A failing SCM may not communicate over the CAN bus, causing:

• Diagnostic trouble codes

• Modules unable to receive driver input

8. Erratic or Random Behavior

Examples:

• Wipers turn on by themselves

• Turn signals switch off unexpectedly

• Horn beeps without pressing it

• Warning lights flash without reason

This often means internal circuitry damage or water intrusion.

9. Steering Wheel Controls Work Only in Certain Positions

If rotating the wheel changes whether controls work, the SCM or clockspring may be failing.