2020 GMC Yukon Fuse Box Diagram & Amperages

As an ASE-certified master technician, I know how frustrating electrical issues can be. Whether your infotainment screen goes black, your 12V auxiliary port stops charging your phone, or your trailer lights won't illuminate, checking the fuses is always the first diagnostic step. The 2020 GMC Yukon is a complex, feature-heavy SUV, meaning it has multiple electrical centers distributing power throughout the vehicle.

This guide provides a comprehensive breakdown of the 2020 GMC Yukon fuse box diagrams, amperage ratings, and circuit protections.

Note: Amperages and fuse assignments can vary slightly depending on your specific trim (SLE, SLT, Denali) and options (like the Max Trailering Package). Always verify with the printed legend on the inside of your fuse box lid.

Quick Answer: Fuse Box Locations

The 2020 GMC Yukon utilizes four main fuse and relay blocks:

1. Engine Compartment Fuse Block: Located on the driver's side of the engine bay, near the battery.
2. Left Instrument Panel Fuse Block: Located on the driver's side end of the dashboard (accessible when the driver's door is open).
3. Right Instrument Panel Fuse Block: Located on the passenger's side end of the dashboard (accessible when the passenger's door is open).
4. Rear Compartment Fuse Block: Located on the driver's side of the rear cargo area, behind an access panel in the trim.

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Engine Compartment Fuse Block

This under-hood fuse box manages high-power electrical systems, engine controls, and primary exterior lighting.

Fuse #	Amp	Color	Circuit / Component Protected
14	15A	Blue	Headlight Low/High Beam (Left)
15	15A	Blue	Headlight Low/High Beam (Right)
20	20A	Yellow	Engine Control Module (ECM) / PCM
23	30A	Green	Starter Motor
27	10A	Red	A/C Compressor Clutch
35	40A	Green	Antilock Brake System (ABS) Pump
45	30A	Pink	Trailer Brake Controller / Trailer Power
53	15A	Blue	Fuel Pump System
59	25A	Clear	Windshield Wipers
62	20A	Yellow	Ignition System
65	10A	Red	Engine Control Module (ECM) Main
71	30A	Pink	Trailer Parking Lamps

Common Relays in this block:

• Relay 34: Starter Relay
• Relay 49: Fuel Pump Relay
• Relay 58: A/C Clutch Relay
• Relay 61: Engine Control Main Relay

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Left Instrument Panel Fuse Block

Found on the driver's side edge of the dash, this block primarily handles driver-centric controls, lighting, and body control functions.

Fuse #	Amp	Color	Circuit / Component Protected
2	15A	Blue	Body Control Module (BCM) 1
6	20A	Yellow	Driver Power Seat
12	10A	Red	Steering Wheel Controls
16	15A	Blue	Turn Signals / Hazard Lamps
22	20A	Yellow	Cigar Lighter / 12V Auxiliary Outlet (Front)
25	15A	Blue	Instrument Cluster
31	15A	Blue	Headlight Switch / Interior Lighting
34	10A	Red	Airbag System (Supplemental Inflatable Restraint)

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Right Instrument Panel Fuse Block

Located on the passenger side edge of the dash, this box manages infotainment, climate control, and cabin accessories.

Fuse #	Amp	Color	Circuit / Component Protected
5	15A	Blue	Radio / Infotainment System
9	15A	Blue	Displays / Navigation
14	20A	Yellow	Cigar Lighter / 12V Auxiliary Outlet (Console)
18	40A	Green	Blower Motor (Front HVAC)
27	15A	Blue	Amplifier / Premium Audio
32	10A	Red	Passenger Occupant Detection System
36	20A	Yellow	Power Windows (Passenger)

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Rear Compartment Fuse Block

Located in the rear cargo area, this block handles the heavy-duty rear features common to large SUVs like the Yukon.

Fuse #	Amp	Color	Circuit / Component Protected
3	30A	Pink	Power Liftgate Module
7	40A	Green	Rear Window Defogger
10	30A	Pink	Rear HVAC Blower Motor
14	15A	Blue	Trailer Reverse Lamps
17	15A	Blue	Rear Park Assist / Blind Spot Module
22	20A	Yellow	12V Auxiliary Outlet (Cargo Area)

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How to Test a Fuse

Before throwing parts at an electrical problem, testing the fuse is the fundamental first step.

1. Locate the suspected fuse: Use the diagrams above and your owner's manual to find the fuse related to the failed component.
2. Perform a Visual Inspection: Use fuse pullers or needle-nose pliers to extract the fuse. Hold it up to the light. If the metal filament inside the plastic casing is broken, melted, or blackened, the fuse is blown and must be replaced.
3. Test with a Multimeter (Recommended): Set your digital multimeter to continuity or resistance (Ohms). Touch the probes to the two metal prongs of the fuse. A continuous beep or a reading near 0.0 Ohms means the fuse is good. If there is no beep or the reading says "OL" (Open Loop), the fuse is bad.
4. Test with a Test Light: Ground your test light and turn the vehicle's ignition to "ON". Touch the test light probe to the two small metal testing points on the top of the fuse while it is plugged in. If it lights up on one side but not the other, the fuse is blown.
5. Always Replace with the Same Amperage: Never install a higher-amperage fuse to "fix" a fuse that keeps blowing. This bypasses the protection circuit and can lead to melted wires or a vehicle fire.

Common Blown Fuses on the 2020 GMC Yukon

Because of how SUVs are used, some circuits blow more often than others:

• 12V Outlets / Cigar Lighters (Left/Right Dash Fuses 22 & 14): Phone chargers, air compressors, and dashcams easily overload these circuits. If a plug-in accessory dies, check here first. Make sure a coin hasn't fallen into the outlet!
• Trailer Lighting (Under-Hood Fuses 45 & 71, Rear Fuse 14): A bad ground or frayed wire on your trailer will instantly pop the Yukon's trailer fuses. If your trailer lights act up, check the fuses before blaming the trailer wiring harness.
• Radio / Infotainment (Right Dash Fuse 5): The GMC IntelliLink/infotainment system can sometimes lock up or freeze. Often, pulling and reinstalling this fuse acts as a hard reset for the system.
• Power Liftgate (Rear Cargo Fuse 3): If snow or ice jams the rear liftgate and the motor struggles, it can blow this 30A fuse to protect the motor from burning out.

Electrical gremlins can be tricky. If a replacement fuse blows immediately upon installation, you have a dead short in the wiring or the component itself that needs professional diagnosis. Find a trusted shop on Repairius.