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 MANUALSGMC2016SIERRA 3500 HD SLE, 4D CAB CHASSIS, 6.6L ENG VIN 8, 4WDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTENTERTAINMENT SYSTEMSCELLULAR SYSTEM, ENTERTAINMENT SYSTEM, AND NAVIGATION SYSTEM - DIAGNOSTIC INFORMATION AND PROCEDURESDIAGNOSTIC INFORMATION AND PROCEDURESDTC B12A4: INFOTAINMENT FACEPLATE CONTROL MODULE ACIRCUIT/SYSTEM VERIFICATION
2016 GMC Sierra 3500 HD SLE, 4D Cab Chassis, 6.6L Eng VIN 8, 4WD
Circuit/System Verification
2016 GMC Sierra 3500 HD SLE, 4D Cab Chassis, 6.6L Eng VIN 8, 4WDSECTION Circuit/System Verification
- Ignition ON.
- Verify DTC B12A4 39 is not set.
- If DTC B12A4 39 is set
Replace the P17 Info Display Module.
- If DTC B12A4 39 is not set
- If DTC B12A4 39 is set
- Verify DTC B12A4 45 is not set.
- If DTC B12A4 45 is set
- Verify the A20 Radio/HVAC Controls or A22 Radio Controls can be programmed using Service Programming System (SPS). Refer to Control Module References
.
- If Service Programming System (SPS) programming is supported, program the A20 Radio/HVAC Controls or A22 Radio Controls and verify the DTC does not set while operating the vehicle within the Conditions for Running the DTC. If the DTC sets, replace the P17 Info Display Module.
- If Service Programming System (SPS) programming is not supported.
- Replace the P17 Info Display Module.
- If DTC B12A4 45 is not set
- All OK.
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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.