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 Aids
2020 GMC Acadia SLSECTION Diagnostic Aids
WARNING: This page is about a different car, the 2021 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
- It is not required to download an app to your device for Apple CarPlay.
- It is recommended to use the device's factory provided USB cable. Aftermarket or third - party cables may not work.NOTE:
Vehicles equipped with RPO PPW have wireless phone projection and it is not required to connect the device to the USB port.
- Visit for a list of Apple CarPlay compatible apps. This does not guarantee the functionality of the app.
- Before beginning diagnostics, if available verify Apply CarPlay works from the customers device on a like vehicle, meaning: Same year, same model, same radio RPO and same radio software level.
- Applications use the mobile device and connection to a service provider to operate. Connection quality issues, or service provider data transmission issues can give the appearance of a vehicle malfunction.NOTE:
Verify if the customer is using their cellular data plan or the vehicle's OnStar data plan.
- Determine if the issue occurs in the same location or if it occurs in multiple locations.
- Devices may lose wireless phone projection connectivity from the vehicle due to interference from external WiFi signals.
- It is required for the device to be connected to the vehicle via Bluetooth and WiFi in order for wireless phone projection to operate.
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.