2020 Chevrolet Silverado 2500HD Fuse Box Diagram & Amperage

Quick Answer

The 2020 Chevrolet Silverado 2500HD has three main fuse box locations:

• Underhood Fuse Block: Located in the engine compartment on the driver's side, near the battery.
• Instrument Panel Fuse Block: Found on the passenger side of the dashboard, behind a removable trim panel.
• Rear Underseat Fuse Block: Located under the rear seat on the driver's side.

Underhood Fuse Block

This fuse block contains fuses and relays for critical engine functions, lighting, and other high-current accessories. Always consult the diagram on the fuse box lid for the most accurate information for your specific trim level.

Instrument Panel Fuse Block

Located inside the cabin, this fuse block manages fuses for interior accessories, radio, infotainment, and various cabin functions. Access it by opening the passenger door and carefully prying off the trim panel on the side of the dashboard.

Rear Underseat Fuse Block

This fuse block provides power to rear accessories, trailer wiring, and other heavy-duty components specific to the Silverado 2500HD. You'll find it under the rear seat on the driver's side, often beneath a cover.

How to Test a Fuse

Testing a fuse is a straightforward process:

1. Locate the fuse: Refer to the fuse box diagrams above and your vehicle's owner's manual or the fuse box lid for the exact location of the suspected blown fuse.
2. Turn off the vehicle: Always ensure the ignition is off and disconnect the battery if you feel uncomfortable working with live circuits.
3. Remove the fuse: Use the plastic fuse puller usually located in the fuse box lid or a pair of needle-nose pliers to carefully pull the fuse straight out.
4. Inspect visually: Hold the fuse up to the light. If the metal wire (filament) inside is broken or burnt, the fuse is blown and needs replacement.
5. Use a multimeter (for a more thorough test):
   • Set your multimeter to the continuity setting (often indicated by an audible beep or an ohm symbol).
   • Touch the probes to the metal terminals on top of the fuse. If the multimeter beeps or shows a reading close to zero ohms, the fuse is good. If there's no beep or an "OL" (open loop) reading, the fuse is blown.
6. Replace the fuse: Always replace a blown fuse with a new one of the exact same amperage and type. Using a fuse with a higher amperage can lead to serious electrical damage or fire.

Common Blown Fuses on this Vehicle

While any fuse can blow, some are more prone to failure due to their circuits or common usage. On the 2020 Chevrolet Silverado 2500HD, common blown fuses often include:

• Cigar Lighter / 12V Power Outlets (Instrument Panel Fuse Block, F2): These fuses commonly blow due to overloads from charging multiple devices or using high-power accessories. If your phone charger or other 12V accessory isn't working, check this first.
• Trailer Brake Controller / Trailer Wiring (Underhood F13, Rear F1, and F5): Given this is a heavy-duty truck, trailer-related fuses can blow if there's a short in the trailer wiring, an overloaded trailer brake system, or issues with the trailer itself. If your trailer lights or brakes aren't functioning, these are key fuses to inspect.
• Blower Motor (Underhood Fuse Block, F11): If your HVAC fan suddenly stops working on all speeds, this fuse is a common culprit. A failing blower motor or a clog in the system can draw excessive current, leading to the fuse blowing.
• Headlights (Underhood Fuse Block, F5, F6, F7, F8): While less common, a short in the headlight circuit or a failing bulb can sometimes cause these fuses to blow. If one or both of your headlights are out, check these fuses after verifying the bulbs.

Always remember to verify the printed legend in your fuse box lid and consult your owner's manual for the most accurate and up-to-date information for your specific vehicle's trim level and options.

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