2025 GMC Sierra 1500 — Fuse Box Diagram & Amperage
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Quick answer
On the 2025 GMC Sierra 1500, you will find fuse boxes in three primary locations:
- Under the Hood: In the engine compartment, on the driver's side.
- Instrument Panel: On the driver's side of the dashboard, accessible when the driver's door is open.
- Left Rear Compartment: In the cargo box area on the left side.
Under-Hood Fuse Block
This is the main fuse box and contains fuses and relays for most of the primary vehicle systems. It is located on the driver's side of the engine bay.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 40A | Green | Antilock Brake System (ABS) Pump |
| F2 | 60A | Yellow | Engine Control Module (ECM)/Powertrain Control Module (PCM) |
| F3 | 20A | Blue | Fuel Pump |
| F4 | 10A | Red | Left High-Beam Headlamp |
| F5 | 10A | Red | Right High-Beam Headlamp |
| F6 | 15A | Blue | Left Low-Beam Headlamp |
| F7 | 15A | Blue | Right Low-Beam Headlamp |
| F8 | 30A | Green | Starter Motor |
| F9 | 40A | Green | Blower Motor |
| F10 | 15A | Blue | A/C Clutch |
| F11 | 25A | Natural | Ignition Coils |
| F12 | 15A | Blue | Oxygen Sensors |
| F13 | 30A | Green | Trailer Brake Control Module |
| F14 | 10A | Red | Airbag/SRS Control Module |
Relays (Under-Hood)
- R1: Starter Relay
- R2: Fuel Pump Relay
- R3: A/C Clutch Relay
- R4: Blower Motor Relay
Instrument Panel Fuse Block
Located on the side of the dashboard on the driver's side, this fuse box is accessible when the driver's door is open. It primarily serves interior components.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F20 | 15A | Blue | Radio/Infotainment System |
| F21 | 10A | Red | Instrument Panel Cluster |
| F22 | 20A | Yellow | Cigar Lighter / 12V Power Outlet 1 |
| F23 | 20A | Yellow | 12V Power Outlet 2 |
| F24 | 10A | Red | Brake Lights |
| F25 | 15A | Blue | Tail Lights/Parking Lights |
| F26 | 25A | Natural | Power Windows |
| F27 | 10A | Red | Airbag System |
Left Rear Compartment Fuse Block
This fuse block is for accessories and systems located in the rear of the truck, including the cargo bed features.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F40 | 20A | Yellow | Trailer Lighting |
| F41 | 15A | Blue | Cargo Bed Lights |
| F42 | 25A | Natural | In-Bed Power Outlet |
Note: Fuse numbers and positions can vary based on your truck's trim level and options. Always verify with the diagram printed on the inside of your fuse box lid.
How to test a fuse
- Turn off the ignition.
- Locate the fuse box and remove the cover.
- Identify the suspect fuse.
- Remove the fuse using a fuse puller (often found in the fuse box).
- Visually inspect the fuse. A blown fuse will have a broken filament inside. You can also use a multimeter to test for continuity.
- Replace the fuse with a new one of the same amperage rating. Using a fuse with a higher rating can cause severe damage to the electrical system.
Common blown fuses on this vehicle
- Cigar Lighter / 12V Power Outlet: Often blows due to faulty phone chargers or other accessories. Check the device you plugged in first.
- Trailer Lights: If your trailer lights are not working, the trailer lighting fuse is the first place to look. This is often caused by a wiring short in the trailer.
- Radio/Infotainment: If your screen is black, check the radio fuse. This can sometimes blow for no apparent reason, but if it blows repeatedly, there may be an issue with the infotainment system.
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Before you pull a fuse on the 2025 GMC Sierra 1500
- Use the label printed on the panel cover or the owner's manual for your exact build. Layouts change with options, model year and build date, so a chart for another truck can be wrong.
- Replace a blown fuse only with the same amp rating. A larger fuse can let wiring overheat.
- A fuse that blows again right away means a short or failing component downstream. Find the cause before replacing it again.
- A good fuse doesn't prove the circuit works — relays, grounds and connectors fail too.
- Disconnect the battery before working near high-current fuses or cables.
Learn more: How fuses, relays and truck electrical systems work
More specs for the 2025 GMC Sierra 1500
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2025 GMC Sierra 1500 Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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