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 INSTRUCTIONSPROGRAMMING ADDITIONAL KEYSADDING 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.
- A total of eight keys maybe be learned to a single vehicle.
- This procedure will only learn the vehicle key information. This procedure will not learn any immobilizer information between the body control module (BCM) and engine control module (ECM).
- 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.
- Follow the on-screen instructions.
- After programming all keys, "Programming Complete" is displayed.
- With a scan tool, clear any DTCs.
- Verify each transmitter and key is operating properly. Operate each of the keyless entry functions using the buttons on the transmitter. On vehicles with a keyed ignition switch, verify the mechanical key by starting the vehicle using the ignition switch. When verifying operation, make sure that no other transmitters are near the vehicle.
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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.