2024 GMC Sierra 2500HD Fuse Box Diagram & Amperage

Quick Answer

The 2024 GMC Sierra 2500HD has two primary fuse box locations:

• Under-hood Fuse Block: In the engine compartment, on the driver's side.
• Instrument Panel Fuse Block: Inside the cab, on the passenger's side, behind the glove box.

Note: Always verify fuse and relay locations with the diagrams printed inside your vehicle's fuse box covers, as configurations can vary based on trim level and optional equipment.

Under-hood Fuse Block

This main fuse block contains higher-amperage fuses and relays that control core vehicle functions, including engine, transmission, lighting, and ABS systems. It is located on the driver's side of the engine bay.

Fuses

Relays

Instrument Panel Fuse Block

This fuse block is located on the passenger side of the cabin. To access it, open and empty the glove box, then press the sides inward to release the retaining tabs, allowing it to swing down fully.

How to Test a Fuse

A blown fuse can be identified visually or with a multimeter.

1. Safety First: Turn the vehicle's ignition completely off.
2. Locate and Remove: Find the suspect fuse using the diagram and gently pull it straight out with a fuse puller (often found in the fuse box cover) or a pair of needle-nose pliers.
3. Visual Inspection: Hold the fuse up to the light. Inside the plastic body is a small metal strip. If this strip is broken or melted, the fuse is blown.
4. Multimeter Test (for certainty): Set your multimeter to the continuity setting (it often looks like a sound wave symbol). Touch one probe to each of the fuse's metal prongs. A good fuse will cause the multimeter to beep. If there is no beep, the fuse is blown and has no continuity.
5. Replacement: Always replace a blown fuse with a new one of the exact same amperage rating. Using a higher-rated fuse can cause severe damage to the electrical circuit and create a fire hazard.

Common Blown Fuses on the 2024 Sierra 2500HD

• Cigar Lighter / 12V Power Outlet Fuse (F29, F30 - Instrument Panel): This is one of the most common fuses to blow. It's often caused by a faulty phone charger, a foreign object (like a coin) falling into the outlet, or plugging in a device that draws too much power. Check the outlet for obstructions before replacing the fuse.
• Trailer Brake/Light Fuses (F24, F40, F41 - Under-hood): Problems with trailer wiring are a frequent cause. A short in the trailer's wiring harness or a faulty bulb on the trailer can blow these fuses. Before replacing, disconnect the trailer and inspect the trailer-side plug and wiring for damage or corrosion.
• Fuel Pump Fuse (F14 - Under-hood): While less common, a sudden no-start condition could be related to the fuel pump fuse. If this fuse is blown, it could indicate a failing fuel pump that is drawing too much current. If a new fuse blows immediately, the fuel pump circuit requires professional diagnosis.

If a fuse blows repeatedly, it signals an underlying short circuit or a component drawing excessive current. It's crucial to diagnose and fix the root cause rather than just replacing the fuse.

Disclaimer: Fuse locations and amperage can vary by trim level and options. Always consult the owner's manual or the diagram on the fuse box lid for your specific vehicle.

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