2018 Buick Regal BaseFACTORY OEM SERVICE PROCEDURE

Replace and Program Control Module Using Existing Rear Differential Assembly

WARNING: This page is about a different car, the 2020 Buick Regal TourX, 2020 Buick Regal, 2019 Buick Regal TourX, and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.

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

    NOTE:

    Steps 1-3 must be performed BEFORE the old K47 Rear Differential Clutch Control Module is removed from the vehicle.

  1. Access the Service Programming System (SPS) and follow the on-screen instructions.
  2. On the SPS Supported Controllers screen, select K47 Rear Differential Clutch Control Module - Prepare the Control Module for Removal and follow the on-screen instructions.
  3. Replace the K47 Rear Differential Clutch Control Module.
  4. On the SPS Supported Controllers screen, select K47 Rear Differential Clutch Control Module - Programming and follow the on-screen instructions.
  5. On the SPS Supported Controllers screen, select K47 Rear Differential Clutch Control Module - Setup and follow the on-screen instructions.
    NOTE:

    RPO G99 = Twin Clutch System

  6. Clear DTCs.
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When to See a Mechanic

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

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

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