2019 GMC Sierra 2500HD Fuse Box Diagram & Amperage

Quick answer

The 2019 GMC Sierra 2500HD has three main fuse box locations: under the hood (engine compartment), inside the cabin (driver's side dash kick panel), and in the rear (under the rear seat on the driver's side).

Under-Hood Fuse Box (Engine Compartment)

This fuse box is located on the driver's side of the engine compartment, near the battery. It contains fuses and relays for critical engine functions, lighting, and other high-current systems. Always refer to the diagram on the fuse box lid for the most accurate information for your specific trim level.

Instrument Panel Fuse Box (Driver's Side Dash Kick Panel)

This fuse box is located on the driver's side of the dashboard, behind a removable panel near the door. It primarily handles power for interior accessories, comfort features, and some communication systems. The exact location and fuse numbering may vary slightly with trim levels.

Rear Under-Seat Fuse Box (Driver's Side)

This fuse box is found under the rear seat on the driver's side, often beneath a removable panel in the floor. It typically handles power for rear accessory outlets, trailer wiring, and some rear lighting. Consult your owner's manual for precise details.

How to test a fuse

Testing a fuse is a straightforward process that can help you diagnose electrical issues. Here's how to do it:

1. Locate the fuse box: Refer to the diagrams above to find the correct fuse box for the circuit you're troubleshooting.
2. Identify the suspected fuse: Use the fuse box legend (usually on the inside of the fuse box lid or in your owner's manual) to find the fuse for the component that isn't working.
3. Visual inspection: Many fuses have a visible wire element. If this wire is broken or melted, the fuse is blown. However, some modern fuses can blow without a clear visual indication.
4. Use a fuse tester or multimeter:
   • Fuse tester: This is the easiest method. A fuse tester typically has two prongs. Touch one prong to each metal contact point on top of the fuse. If the tester lights up, the fuse is good. If it doesn't, the fuse is blown.
   • Multimeter: Set your multimeter to the continuity setting (often indicated by a speaker icon). Touch one probe to each metal contact point on the fuse. A good fuse will show a reading of continuity (or beep, if your multimeter has an audible continuity test). If there's no continuity, the fuse is blown.
5. Replace the fuse: If a fuse is blown, replace it with a new fuse of the exact same amperage (A) and type. Using a fuse with a higher amperage can cause serious electrical damage or fire.

Common blown fuses on this vehicle

While the 2019 GMC Sierra 2500HD is a robust truck, certain fuses can blow more commonly due to wear, electrical spikes, or common accessory usage. If you're experiencing an electrical issue, start by checking these fuses:

• Cigar Lighter / 12V Outlets (Dash Fuse F5, Rear Fuse F1): These are frequently blown due to over-drawing power from accessories like phone chargers, portable air compressors, or even faulty devices. If your 12V outlets aren't working, check these first.
• Trailer Brake Controller (Under-Hood Fuse F13): Heavy towing and electrical demands placed on the trailer braking system can sometimes lead to this fuse blowing. If your trailer brakes aren't engaging, this is a prime suspect.
• Headlights (Under-Hood F5-F8): While less common than accessory fuses, a burnt-out headlight bulb can sometimes cause its corresponding fuse to blow. If one or both headlights are out, check these fuses.
• Blower Motor (Under-Hood Fuse F11): If your cabin fan isn't working on any speed, this high-amperage fuse is a common culprit. A failing blower motor or an obstruction can cause it to draw too much current and blow the fuse.
• Radio / Infotainment System (Dash Fuse F1): Issues with the radio, display, or sound can sometimes be traced back to this fuse. If your infotainment system is completely dead, check this fuse first.

Always check the printed legend inside your fuse box lid and your owner's manual for the most accurate and up-to-date information for your specific vehicle's trim and options.

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