Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Programming an Existing or New Control Module
To program an existing or new control module, perform the following procedure:
- Install the special tool: EL-49642 SPS Programming Support Tool
- Open the Service Programming System (SPS) - Refer to: Service Programming System (SPS)
- Select: J2534 MDI
- Select: Reprogram ECU
- Select: Vehicle Data
- Select: K73 Telematics Communication Interface Control Module
- Select: Programming
- Select: Normal
- Follow the on-screen instructions.
- The SPS programming must have successfully completed before continuing.
- Open the dealer OnStar portal and navigate to the control module exchange page.
- Follow the on-screen instructions.
- Press the blue OnStar button and ask the OnStar advisor to activate the OnStar subscription again.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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