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.
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HOMESERVICE MANUALSGMC2021SIERRA 2500 HD AT4, 6.6L ENG VIN 7REPAIR AND DIAGNOSISBODY & FRAMEIGNITION SWITCH/STEERING LOCKIMMOBILIZER SYSTEMREPAIR INSTRUCTIONSKEY WITH INTEGRATED TRANSMITTER PROGRAMMINGADDING KEYS (WITH SPS)
2021 GMC Sierra 2500 HD AT4, 6.6L Eng VIN 7
Adding Keys (With SPS)
2021 GMC Sierra 2500 HD AT4, 6.6L Eng VIN 7SECTION Adding Keys (With SPS)
NOTE:
- This procedure may be used with or without existing learned keys being present. If no existing keys are available, this procedure must be used.
- A total of eight keys maybe be learned to a single vehicle.
- This procedure will only learn the vehicle key information.
- If the battery voltage is low, charge the battery before continuing with the procedure.
- Connect a scan tool to the vehicle and access SPS.
- Ensure that all power consuming devices are turned OFF on the vehicle.
- Select the SPS application and follow the on-screen instructions.
- Select Reprogram ECU.
- Select IMMO Immobilizer Learn - Setup.
- Select the Program Transponder or Remote Key (Add) function.
- At multiple times during the learn procedure, SPS will instruct you to turn the ignition to the run position. Make sure the vehicle is actually in the run mode before continuing on the SPS terminal. If the ignition is not in the run mode, the learn procedure will fail.
- The key slot in vehicles without bucket seats is located inside the front center seat at the rear of the storage compartment. The key slot in vehicles with bucket seats is located in the center console between the two cup holders..
- Follow the on-screen instructions.
- After programming all keys, Programming Complete, is displayed.
- Press and hold the ignition mode switch for 15 seconds.
- Press the lock and unlock button on each key that was programmed. This will awaken each key and allow passive and active keyless entry functions to be established.
- With a scan tool, clear any DTCs.
- Verify each key is operating properly. Operate each of the keyless entry functions using the buttons on the key and then start the vehicle. When verifying operation, make sure that no other keys are near the vehicle.
NOTE:
NOTE:
If the programming does not complete or hangs during the programming operation, refer to Unable to Complete Programming below.
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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.