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.
Circuit/System Verification
2021 GMC Terrain SLT, 4WDSECTION Circuit/System Verification
- Ignition/Vehicle & All vehicle systems - Off
- Test for 12.4 to 12.8 V between the test points: Battery Positive Post & Battery Negative Post
- If not between 12.4 and 12.8 V
Refer to: Battery Inspection/Test
- Go to next step: If between 12.4 and 12.8 V
- If not between 12.4 and 12.8 V
- Engine - Running - For greater than 15 s
- Accessories - Off
- Test for 13.4 to 15 V between the test points: Battery Positive Post & Battery Negative Post
- If not between 13.4 and 15 V
Refer to: Charging System Test
- Go to next step: If between 13.4 and 15 V
- If not between 13.4 and 15 V
- Verify the scan tool parameter: Battery Voltage @ Appropriate control module. = Within 1 V of the battery voltage
- If not within 1 V of each other
Refer to: Circuit/System Testing
- Go to next step: If within 1 V of each other
- If not within 1 V of each other
- Verify the scan tool parameter: Ignition Voltage @ Control Module = Within 1 V of the battery voltage
- If not within 1 V of each other
Refer to: Circuit/System Testing
- Go to next step: If within 1 V of each other
- If not within 1 V of each other
- All OK.
NOTE:
The battery voltage should stabilize after a few minutes of turning the ignition/vehicle Off.
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.