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 MANUALSGMC2024SIERRA 2500 HD DENALI ULTIMATEREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESPROGRAMMING AND SETUP - ALL SYSTEMSREPAIR INSTRUCTIONSP16 INSTRUMENT PANEL CLUSTER CONTROL MODULE: PROGRAMMING AND SETUPREPLACE AND PROGRAM ECU (UDC OR UDD)
2024 GMC Sierra 2500 HD Denali Ultimate
Replace and Program ECU (UDC or UDD)
2024 GMC Sierra 2500 HD Denali UltimateSECTION Replace and Program ECU (UDC or UDD)
To program a replacement or an existing ECU, perform the following procedure:
- Ignition ON/Vehicle in Service Mode.
- Access the Service Programming System (SPS) and follow the on-screen instructions.
- Ignition/Vehicle OFF.
- On the SPS Supported Controllers screen, select P16 Instrument Cluster - Programming and follow the on-screen instructions.
- On the SPS Supported Controllers screen, select P16 Instrument Cluster - Setup and follow the on-screen instructions.
- 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.