2021 GMC Acadia: Fuse Box Diagram & Amperage

Quick Answer

The 2021 GMC Acadia has three main fuse box locations:

• Under the Hood: In the engine compartment, on the driver's side.
• Passenger Compartment: Behind a trim panel on the passenger side of the dashboard.
• Rear Cargo Area: Behind a small access panel on the driver's side.

Always verify fuse and relay locations with the diagram printed on the inside of the fuse box cover, as configurations can vary based on trim level and options.

Under-Hood Fuse Box

This fuse box contains high-amperage fuses and relays that control major vehicle systems like the engine, transmission, cooling fans, and lighting. To access it, open the hood and locate the black plastic cover on the driver's side, near the battery.

Fuses

Relays

Passenger Compartment Fuse Box

Located on the outer side of the passenger-side dashboard, this fuse block is hidden behind a removable trim panel. Open the passenger door to access it. This panel primarily protects interior circuits.

Rear Cargo Area Fuse Box

This small fuse box is located in the cargo area, behind an access panel on the driver's side trim. It services rear-body components.

How to Test a Fuse

Visually inspecting a fuse is the simplest method.

1. Turn the vehicle's ignition off.
2. Locate and remove the suspect fuse using a fuse puller (often found in the fuse box lid) or needle-nose pliers.
3. Hold the fuse up to the light. Inside the plastic body is a small metal strip. If this strip is broken or appears melted, the fuse is blown and needs to be replaced.
4. If the strip is intact, the fuse is likely good. For a more definitive test, use a multimeter set to continuity or resistance (Ohms). A good fuse will show continuity or near-zero resistance. A blown fuse will show an open circuit or infinite resistance.

When replacing a fuse, always use a new fuse with the identical amp rating. Using a higher-rated fuse can cause severe damage to the electrical circuit and create a fire hazard.

Common Blown Fuses on the 2021 GMC Acadia

• Cigar Lighter / 12V Power Outlet Fuse (F46 or F47 - Passenger, F4 - Rear): This is one of the most common fuses to blow. It is often caused by a faulty phone charger, a coin falling into the outlet, or a device that draws too much power. Before replacing the fuse, inspect the outlet for any foreign objects and check the accessory you plugged in.
• Fuel Pump Fuse (F15 - Under-Hood): If your Acadia cranks but won't start, a blown fuel pump fuse could be the culprit. If this fuse blows repeatedly, it may indicate a failing fuel pump or a short in the wiring that needs professional diagnosis.
• Blower Motor Fuse (F51 - Under-Hood): If your HVAC fan suddenly stops working on all speeds, check this high-amperage fuse first. If the fuse is blown, it could be a sign that the blower motor itself is failing and drawing too much current.

If you're dealing with persistent electrical issues or aren't comfortable performing these checks yourself, it's best to seek professional help. Electrical system diagnosis can be complex and requires specialized tools. Find a trusted shop on Repairius.