2020 Chevrolet Suburban: Fuse Box Diagram & Amperage
Find every fuse box location, identify the correct fuse for any circuit, and learn how to diagnose common electrical problems on your 2020 Suburban.
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Quick answer
The 2020 Chevrolet Suburban has three main fuse box locations:
- Under-hood fuse block: In the engine compartment, on the driver's side.
- Instrument panel fuse block: On the driver's side of the instrument panel, accessible when the driver's door is open.
- Rear cargo area fuse block: In the rear cargo area, on the driver's side, behind a removable panel.
Under-hood Fuse Block
This fuse block contains fuses and relays for high-current systems and engine-related components. Always disconnect the battery before servicing high-amperage fuses.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F11 | 40A | Green | Antilock Brake System (ABS) Pump |
| F13 | 30A | Pink | Electric Trailer Brake Controller |
| F23 | 20A | Yellow | Fuel Pump |
| F29 | 25A | Natural | Engine Control Module (ECM) |
| F34 | 15A | Blue | Left High-Beam Headlamp |
| F35 | 15A | Blue | Right High-Beam Headlamp |
| F36 | 15A | Blue | Left Low-Beam Headlamp |
| F37 | 15A | Blue | Right Low-Beam Headlamp |
| F43 | 60A | Yellow | Ignition |
| F51 | 30A | Green | Starter Relay |
| F59 | 40A | Green | Blower Motor |
| F61 | 30A | Pink | Air Conditioning (A/C) Clutch |
Relay Locations:
- KR2: Starter Relay
- KR5: A/C Clutch Relay
- KR10: Fuel Pump Relay
Instrument Panel Fuse Block
This fuse block is located on the driver's side of the dashboard, accessible by opening the driver's door and removing the side panel. It primarily protects interior circuits.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 15A | Blue | Infotainment System, Radio |
| F12 | 10A | Red | Airbag System (SRS) |
| F18 | 20A | Yellow | Cigarette Lighter / 12V Power Outlet (Front) |
| F21 | 15A | Blue | Tail Lamps, Park Lamps |
| F22 | 10A | Red | Brake Switch |
| F31 | 10A | Red | ECM, Ignition Coils |
| F33 | 15A | Blue | Instrument Panel Cluster |
Rear Cargo Area Fuse Block
Located on the driver's side of the cargo area, this fuse block handles circuits for rear-mounted components.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F5 | 20A | Yellow | 12V Power Outlet (Cargo Area) |
| F14 | 25A | Natural | Rear Window Defogger |
| F23 | 10A | Red | Trailer Backup Lamps |
| F28 | 20A | Yellow | Fuel Pump Power Module |
Note: Fuse numbers and positions can vary based on your vehicle's trim level and options. Always consult the fuse legend printed on the inside of the fuse box cover to verify the correct fuse for the circuit you are checking.
How to test a fuse
Testing a fuse is a simple process:
- Turn off the ignition and all accessories.
- Locate and remove the fuse in question. A fuse puller tool, often found in the fuse box, is helpful.
- Visually inspect the fuse. A blown fuse will have a broken or melted metal strip inside.
- Use a multimeter or test light. For a more definitive test, set your multimeter to the continuity setting. Touch the probes to each of the fuse's metal tabs. A good fuse will show continuity (a reading near zero ohms) and the multimeter will beep. A blown fuse will show no continuity.
- Replace a blown fuse with a new fuse of the exact same amperage rating. Using a higher-rated fuse can cause a fire.
Common blown fuses on this vehicle
- Cigarette Lighter / 12V Power Outlet Fuse: This fuse often blows due to faulty phone chargers or other devices plugged into the outlet. If the fuse blows repeatedly, inspect the outlet for foreign objects or damage.
- Trailer Light Fuses: If your trailer lights aren't working, the fuses for the trailer brake controller and trailer lighting circuits are the first things to check. Damaged trailer wiring is a common cause of these fuses blowing.
- Fuel Pump Fuse: A blown fuel pump fuse will prevent the engine from starting. While a fuse can blow for no apparent reason, a repeatedly blowing fuel pump fuse may indicate a failing fuel pump or a problem with the fuel pump wiring.
If you are not comfortable performing these checks yourself, or if a fuse continues to blow after being replaced, it is best to have the vehicle diagnosed by a qualified technician.
Find a trusted shop on Repairius.
Before you pull a fuse on the 2020 Chevrolet Suburban
- 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 2020 Chevrolet Suburban
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
2020 Chevrolet Suburban 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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