2021 GMC Yukon AT4FACTORY OEM SERVICE PROCEDURE

Replace and Program Control Module

To program a replacement control module, perform the following procedure:

NOTE:

When replacing the entire steering gear, follow the steps for Reprogram Control Module.

  1. Replace the Power Steering Control Module. Refer to Control Module ReferencesΒ .
  2. NOTE:

    The next two steps will transfer the vehicle's critical data, including the worm gear wear counter data saved in step 1, back to the vehicle components.

  3. On the SPS Supported Controllers screen, select K43 Power Steering Control Module - Programming and follow the on-screen instructions.
  4. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down.
  5. Ignition ON.
  6. On the SPS Supported Controllers screen, select K43 Power Steering Control Module - Setup and Configuration and follow the on-screen instructions.
  7. Clear DTCs.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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