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 DIAGNOSISACCESSORIES & EQUIPMENTSTEERING COLUMN SWITCHESSECONDARY AND CONFIGURABLE CUSTOMER CONTROLSDIAGNOSTIC INFORMATION AND PROCEDURESSTEERING WHEEL CONTROLS MALFUNCTIONCIRCUIT/SYSTEM VERIFICATION

2021 GMC Sierra 2500 HD AT4, 6.6L Eng VIN 7

Circuit/System Verification

2021 GMC Sierra 2500 HD AT4, 6.6L Eng VIN 7SECTION Circuit/System Verification

Ignition - On / Vehicle - In Service Mode
Verify the function:Radio Controls = Inoperative
- If the specified state
  Refer to:Symptoms - Entertainment
- Go to next step: If not the specified state
Press the following button:S70R Steering Wheel Controls Switch - Right - All
Verify the scan tool parameter:Steering Wheel Control Switches = Displays each of the specified states.
- If not the specified state
  Replace the component:S70R Steering Wheel Controls Switch - Right
- Go to next step: If the specified state
Operate the component:S70E Steering Wheel Controls Switch - Radio Presets - Next Preset & Previous Preset
Verify the scan tool parameter:Steering Wheel Control Switches = Displays each of the specified states.
- If not the specified state
  Refer to: Circuit/System Testing/S70E Steering Wheel Controls Switch - Radio Presets
Operate the component:S70F Steering Wheel Controls Switch - Radio Volume - Volume Down Button & Volume Up Button
Verify the scan tool parameter:Steering Wheel Control Switches = Displays each of the specified states.
- If not the specified state
  Refer to: Circuit/System Testing/S70F Steering Wheel Controls Switch - Radio Volume
- Go to next step: If the specified state
All OK.

RENDER: 1.0x

NO RELATED

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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.