2023 GMC Sierra 1500 Fuse Box Diagram & Amperage Guide

Welcome to Repairius! I’m an ASE-certified master technician, and today we’re walking through the electrical nerve center of one of America’s favorite trucks. When a system randomly stops working on your 2023 GMC Sierra 1500, checking the fuses is step number one.

Modern trucks like the 2023 Sierra 1500 are highly computerized, relying on multiple fuse blocks to handle everything from engine management to advanced trailering systems. Below, you will find a comprehensive guide to the fuse box locations, along with diagrams and amperage ratings for the most critical circuits.

Disclaimer: Fuse configurations can vary based on trim level (Pro, SLE, SLT, AT4, Denali, Denali Ultimate) and engine options (2.7L, 5.3L, 6.2L, or 3.0L Duramax). Always verify the printed legend on the inside of your fuse box lid before replacing a fuse.

Quick Answer: 2023 GMC Sierra 1500 Fuse Box Locations

Your 2023 GMC Sierra 1500 features three primary fuse blocks to manage its complex electrical systems:

1. Engine Compartment Fuse Block: Located under the hood on the passenger side, near the battery.
2. Right Instrument Panel Fuse Block: Located in the passenger-side footwell, behind a trim panel on the right kick panel.
3. Left Instrument Panel Fuse Block: Located on the driver’s side, usually behind the end cap of the dashboard or under the dash.

Engine Compartment Fuse Block

The under-hood fuse box houses the high-amperage maxi fuses, relays, and critical powertrain components. It manages the ECM, fuel pump, ABS, starter relay, and exterior lighting. To access it, open the hood, locate the black box on the passenger side near the firewall, and release the retaining clips.

Note: The Engine Compartment block also holds several large J-Case fuses (numbered F75+) for main power feeds to the instrument panel blocks.

Right Instrument Panel Fuse Block (Passenger Side)

The passenger compartment fuse block handles the interior cabin accessories, infotainment system, climate control modules, and power outlets. It is located behind a removable access panel in the right-side kick panel area of the passenger footwell.

Left Instrument Panel Fuse Block (Driver Side)

Located on the driver’s side, this fuse block handles driver-specific controls, auxiliary switches, and additional body control module feeds. Depending on your configuration, it is accessible behind the left-side dash end cap when the driver's door is open.

How to Test a Fuse

Before replacing expensive parts, always check the corresponding fuse. Here is the professional way to do it:

1. Visual Inspection: Pull the suspect fuse using the plastic puller provided in the fuse box lid (or a pair of needle-nose pliers). Hold it up to a light. If the U-shaped metal wire inside is broken or charred black, the fuse is blown.
2. The Test Light Method: For faster diagnosis without pulling the fuse, attach a 12V automotive test light clamp to a good metal ground. Turn the ignition ON. Touch the probe to the two tiny exposed metal test points on the top of the fuse. If the test light illuminates on both sides, the fuse is good. If it lights up on only one side, the fuse is blown.
3. The Multimeter Method: Set your digital multimeter to continuity (the setting that beeps) or Ohms. Touch one probe to each side of the fuse. A continuous beep or a reading near 0.0 ohms means the fuse is intact. "OL" (Open Line) means it has blown.

Always replace a blown fuse with one of the exact same amperage. Never insert a higher-amp fuse, as this removes the safety barrier and can result in melted wires or an electrical fire.

Common Blown Fuses on this Vehicle

If you drive a 2023 GMC Sierra 1500, keep an eye out for these frequent electrical hiccups:

• 12V Power Outlets (Cigar Lighter): The power point fuses (Right I/P fuses F7 or F16) frequently blow if you plug in a high-draw device like a cheap tire inflator or a faulty phone charger. Check the charger for debris inside the tip before replacing the fuse.
• Trailer Lighting Fuses: Towing a trailer with bad wiring or a shorted plug is the number one cause of blown trailer turn/stop fuses (Under-hood F70) and trailer brake fuses (Under-hood F63). If you lose trailer lights, check the fuse box under the hood first, then inspect your trailer's wiring harness for rubbing or damage.
• Radio/Infotainment Glitches: Sometimes the 15-amp radio fuse (Right I/P F3) doesn't blow, but pulling it for 5 minutes and reinstalling it can perform a hard reset on a frozen infotainment screen.

When electrical issues go beyond a simple fuse swap—such as a short circuit that immediately blows the replacement fuse—it’s time to call in a professional. Diagnosing late-model CAN-bus electrical faults requires specialized equipment and training.

Find a trusted shop on Repairius.