2018 Chevrolet Tahoe Fuse Box Diagram & Amperage
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Quick answer:
The 2018 Chevrolet Tahoe features three main fuse box locations: under the hood (engine compartment), inside the cabin (instrument panel/driver's side kick panel), and in the rear cargo area.
Under-Hood Fuse Box
The under-hood fuse box is located in the engine compartment on the driver's side, near the battery. It contains fuses and relays for critical engine functions, lights, and other high-current accessories. Always consult the diagram on the fuse box lid for the most accurate information, as fuse configurations can vary slightly by trim level and optional equipment.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 10 | Red | Engine Control Module (ECM) / Powertrain Control Module (PCM) |
| F2 | 15 | Blue | Fuel Pump Relay Coil / Fuel Pump |
| F3 | 10 | Red | Ignition Coils |
| F4 | 20 | Yellow | Starter Solenoid |
| F5 | 15 | Blue | Headlight (Low Beam - Left) |
| F6 | 15 | Blue | Headlight (Low Beam - Right) |
| F7 | 20 | Yellow | Headlight (High Beam - Left) |
| F8 | 20 | Yellow | Headlight (High Beam - Right) |
| F9 | 10 | Red | Tail Lights / Parking Lights |
| F10 | 30 | Green | Anti-lock Brake System (ABS) Pump |
| F11 | 20 | Yellow | ABS Valves |
| F12 | 40 | Green | Blower Motor (Front) |
| F13 | 15 | Blue | A/C Clutch |
| F14 | 20 | Yellow | Trailer Brake Control / Trailer Wiring |
| F15 | 10 | Red | Oxygen Sensors |
| F16 | 10 | Red | Transmission Control Module (TCM) |
| F17 | 15 | Blue | Horn |
| F18 | 10 | Red | Fog Lights |
| F19 | 25 | Clear | Power Distribution Module (PDM) |
| F20 | 20 | Yellow | Power Steering Control Module |
Relay Locations (Under-Hood):
- R1: Fuel Pump Relay
- R2: Starter Relay
- R3: Headlight Low Beam Relay
- R4: Headlight High Beam Relay
- R5: Horn Relay
- R6: A/C Clutch Relay
- R7: Blower Motor Relay (Front)
Instrument Panel Fuse Box (Driver's Side)
This fuse box is located on the driver's side of the dashboard, typically behind a removable panel on the kick panel. It houses fuses for various interior electrical components and accessories.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 10 | Red | Radio / Infotainment System |
| F2 | 20 | Yellow | Cigar Lighter / 12V Power Outlet (Front) |
| F3 | 10 | Red | Accessory Power Module (APM) |
| F4 | 15 | Blue | Interior Lights / Dome Lights |
| F5 | 10 | Red | Airbag Control Module (ACM) |
| F6 | 15 | Blue | Brake Lights / CHMSL |
| F7 | 10 | Red | Instrument Cluster |
| F8 | 10 | Red | HVAC Control Panel |
| F9 | 25 | Clear | Power Windows (Driver's Side) |
| F10 | 20 | Yellow | Power Windows (Passenger's Side) |
| F11 | 10 | Red | Sunroof (if equipped) |
| F12 | 15 | Blue | Wiper Motor (Front) |
| F13 | 10 | Red | Washer Pump (Front) |
| F14 | 5 | Tan | OnStar / Telematics Unit |
| F15 | 15 | Blue | Door Locks |
| F16 | 10 | Red | Heated Seats (Driver's) |
| F17 | 10 | Red | Heated Seats (Passenger's) |
| F18 | 5 | Tan | Exterior Mirror |
| F19 | 10 | Red | USB Ports |
| F20 | 15 | Blue | Auxiliary Power Outlet (Console) |
Rear Cargo Area Fuse Box
Another fuse box is located in the rear cargo area, often on the driver's side panel. This box typically manages power for rear accessories, trailer functions, and certain convenience features.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 20 | Yellow | Rear 12V Power Outlet |
| F2 | 15 | Blue | Liftgate Release |
| F3 | 10 | Red | Rear HVAC Control Module |
| F4 | 30 | Green | Trailer Wiring (Charge Line) |
| F5 | 20 | Yellow | Trailer Wiring (Backup Lights) |
| F6 | 15 | Blue | Power Liftgate Motor (if equipped) |
| F7 | 10 | Red | Rear Wiper Motor |
| F8 | 10 | Red | Rear Washer Pump |
| F9 | 15 | Blue | Rear Entertainment System (if equipped) |
| F10 | 10 | Red | Power Fold Third Row Seats (if equipped) |
How to Test a Fuse
Testing a fuse is a straightforward process that can help diagnose electrical issues. Here's a common method:
- Locate the Fuse Box: Refer to your owner's manual or the quick answer section above to find the correct fuse box.
- Identify the Suspect Fuse: Look at the fuse box diagram (usually on the lid or in the owner's manual) to identify the fuse corresponding to the non-working component.
- Visual Inspection: Most automotive fuses are clear, allowing for a visual inspection. A blown fuse will have a broken wire or melted metal strip inside. If it's not clear, you'll need a multimeter or fuse tester.
- Use a Fuse Tester or Multimeter:
- Fuse Tester: These are simple tools with a light that illuminates if the fuse is good. Touch the probes to the small metal test points on the top of the fuse. If the light comes on, the fuse is good.
- Multimeter: Set your multimeter to continuity mode (looks like a speaker icon) or the lowest ohms setting. With the fuse removed from its slot, touch one probe to each metal blade of the fuse. A good fuse will show continuity (a beep or a reading close to 0 ohms). A blown fuse will show no continuity or an
Before you pull a fuse on the 2018 Chevrolet Tahoe
- 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 2018 Chevrolet Tahoe
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
2018 Chevrolet Tahoe 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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