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.
2021 GMC Terrain SLFACTORY OEM SERVICE PROCEDURE
Front of the Passenger Compartment
Front of the Passenger Compartment
| Items |
|---|
| 1. T3 Audio Amplifier (UQA) T3 Audio Amplifier X1 (UQA+(IOS/IOT/IOU)) , or T3 Audio Amplifier X2 (UQA+(IOS/IOT/IOU)) , or T3 Audio Amplifier X3 (UQA+(IOS/IOT/IOU)) , or T3 Audio Amplifier X4 (UQA+(IOS/IOT/IOU)) . |
| 2. K108 Active Noise Cancellation Module (NKC and UZ6 without IOR) K108 Active Noise Cancellation Module X1 (NKC+UZ6) , or K108 Active Noise Cancellation Module X2 (NKC+UZ6) , or K108 Active Noise Cancellation Module X3 (NKC+UZ6) . |
Factory Service Tools
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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.
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