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.
Diagnostic Fault Information
2021 GMC Terrain SLT, 4WDSECTION Diagnostic Fault Information
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
| B+ (front floor console compartment USB/SD card reader) | B124B, 1, 3 | B124B, 1, 2 | - | - |
| B+ (inside center console USB ports) | B124C, 1, 3 | B124C, 1, 2 | - | - |
| USB Cable (front floor console compartment USB/SD card reader) | B124B, 1 | B124B, 1 | B124B, 1 | - |
| USB Cable (inside center console USB ports) | B124C, 4 | B124C, 4 | B124C, 4 | - |
| Ground | - | 1, 4 | - | - |
| 1. Auxiliary Jack, SD Card reader and/or USB port(s) Inoperative 2. Fault may affect one or more components, dependant on fault location 3. Fault affects multiple components, dependant on vehicle equipment 4. Inside center console USB ports inoperative |
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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.