2025 GMC Sierra 2500HD Fuse Box Diagram & Amperage

Quick answer

The 2025 GMC Sierra 2500HD has three primary fuse box locations:

1. Under-Hood Fuse Block: Located in the engine bay on the driver's side.
2. Instrument Panel Fuse Block: Located on the driver's side of the dashboard, accessible when the driver's door is open.
3. Interior Fuse Block (Rear): Located behind the rear seat on the driver's side, often housing trailer and auxiliary power circuits.

Disclaimer: The fuse numbers, amperage, and circuits listed below are based on the most common configuration for the 2025 GMC Sierra 2500HD. However, configurations can vary significantly based on trim level, engine (gasoline vs. diesel), and installed options. Always verify the fuse locations and functions by checking the diagrams printed on your vehicle's fuse box covers or consulting your owner's manual.

Under-Hood Fuse Block

This fuse block contains high-amperage fuses and relays that protect the most critical engine and powertrain components. It's a black plastic box located on the driver's side of the engine compartment.

Instrument Panel Fuse Block

This fuse box is located on the side of the dashboard, accessible by opening the driver's side door. It primarily protects the interior electronics and cabin functions.

Interior Fuse Block (Rear Cabin)

For HD trucks, there is often a third fuse block to handle the high demands of trailering and other auxiliary functions. In the 2025 Sierra HD, this is typically found behind the rear seat assembly.

How to test a fuse

If a component has stopped working, a blown fuse is a likely culprit. Here’s how to check:

1. Turn off the vehicle and the affected component.
2. Locate the correct fuse box and remove the cover.
3. Identify the suspect fuse using the diagram on the cover or in your owner’s manual.
4. Remove the fuse. A small fuse puller tool is often included in the fuse box lid.
5. Visually inspect the fuse. A good fuse has an intact, unbroken metal filament running through its center. A blown fuse will have a broken or melted filament.
6. Test with a multimeter (optional but recommended). Set your multimeter to the continuity setting (it looks like a sound wave). Touch the probes to the two metal blades on the top of the fuse. If the multimeter beeps, the fuse is good. If it stays silent, the fuse is blown.

If a fuse is blown, replace it with a new one of the exact same amperage rating. Using a higher-rated fuse can cause a fire.

Common blown fuses on this vehicle

• Cigar Lighter / 12V Power Outlet Fuse (Instrument Panel, F9): This is one of the most common fuses to blow. It's almost always caused by a faulty phone charger, a frayed charging cable, or an object falling into the outlet and shorting it out. Before replacing the fuse, inspect the outlet and the device you plugged into it.

• Trailer Brake / Light Fuses (Under-Hood F52, Rear F1/F5/F7): If your trailer lights or brakes aren't working, but the truck's are, the problem is almost certainly a blown fuse caused by the trailer's wiring. Trailer wiring is exposed to the elements and prone to shorts. Check the trailer's plug and wiring for any damage or corrosion before replacing the fuse.

• Radio / Infotainment Fuse (Instrument Panel, F2): If your screen is black and the radio won't turn on, this fuse is the first thing to check. If it blows repeatedly, it could indicate a problem with an aftermarket accessory you've installed or a fault within the head unit itself.

If you find yourself replacing the same fuse repeatedly, it indicates an underlying electrical problem that needs to be diagnosed by a professional.

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