Chevrolet Trailblazer 2021 Fuse Replacement

Having an electrical issue? It could be a blown fuse — an easy fix you can do yourself.

Follow the steps below to find and replace the fuse:

Step 1: Find the Fuse Box

In your Chevrolet Trailblazer 2021, the interior fuse box is typically located under the dashboard on the driver's side. Some vehicles also have an additional fuse box in the engine compartment. Check your owner's manual or the fuse box cover for the exact location.

Step 2: Identify the Corresponding Fuse

Below is the complete fuse list for your vehicle. Find the circuit that isn't working and note the fuse number and amperage.

Instrument panel Fuse Box

Fuse #FunctionAmperage
F01LUMBAR
F02SUNROOF
F03VBAT 3
F04VBAT 7
F05VBAT 6
F06AUTO HVAC
F07CGM
F08ST WHL HTR
F09DISPLAY
F10RADIO
F11ONSTAR
F12PARK ASSIST
F13MAN. HVAC
F14WL CHARGER
F15VBAT 2
F16VBAT 1
F17SWC BKLT
F18Spare
F19Spare
F20CLOCK SPRING
F21OCC SEN
F22DLC
F23SDM
F24IGN SW/ESCL
F25PWR L-GATE MDL
F26SEC FUSE-2
F27PWR SEAT CO-DR
F28VBAT 8
F29DC-DC
F30PWR L-GATE MDL
F31OSRVM
F32FRT HS PWR-1
F33VBAT 4
F34FRT HS PWR-2
F35AMPLIFIER
F36SEC FUSE-1
F37PWR SEAT DR
F38DC-DC 400W / DC-DC 200W
F39Spare2022
F40HVAC BLOWER
F41/CB1Spare
CB2APO (Circuit Breaker)
RelaysSpare
K01i-RAP ACC
K02RUN
K03LOGISTICS
K04Spare
K05Spare
K06Spare

Engine compartment Fuse Box

Fuse #FunctionAmperage
F01Spare
F02CLSTR
F03Spare
F04FRT WPR
F05Spare
F06OSRVM DEFOG
F07L/GATE RELSE
F08AHL AFL MTR1
F09VENT SEAT
F10Spare
F11AHL AFL MTR2
F12Spare
F13REAR WNDW DEFOG
F14ISRVM REAR VIEW CAMERA
F15DEFC MDL RUN/CRNK
F16HDLP LVL
F17Spare
F18FTZM
F19Spare
F20Spare
F21E-BOOST PWR1
F22TRLR ST/TRN LT - TRLR
F23STRTR PINION
F24ESCL
F25ECM TCM RUN/CRNK
F26FRT/REAR WSW PUMP
F27IGN COIL - Gasoline; ECM PT3 - Diesel
F28AERO SH
F29AHL AFL MDL
F30STRTR SOL
F31ECM PT2
F32ENG COMP2
F33RVC
F34FRT FOG LP
F35ENG COMP1
F36ECM PT1
F37AUX OIL PUMP
F38TRLR PRK LAMP - TRLR
F39Spare
F40AUX WATER PUMP
F41REAR WPR
F42HORN
F43PWR WNDW RT
F44REAR WPR PRK
F45A/C CLTCH
F46Spare
F47ECM BATT
F48CLOW PLUG
F49HDLP HI LH
F50Spare
F51HDLP HI RH
F52NOX SOOT SNSR - Diesel; TRLR ST/TRN RT - TRLR
F53Spare
F54PEPS
F55PWR WNDW LT
F56CNSTR VENT SOL - Gasoline; DEFC MDL - Diesel
F57DEFC MDL
F58TCM BATT
F59Spare
F60DEF HTR
F61Spare
F62FUEL HTR - Diesel
F63Spare
SF01-SF06Spare Fuses
RelaysSpare
K01Spare
K02Spare
K03RUN/CRNK
K04REAR DEFOG
K05STRTR SOL
K06STRTR PINION
K07A/C CNTRL
K08PT RLY
K09FUEL HTR DSL
K10Spare
K11Spare

Trunk Fuse Box

Fuse #FunctionAmperage
F01Spare
F02RDCM ELEC
F03Spare
F04Spare
F05DC/AC INVERTER
F06Spare
F07RDCM
F08RR SEAT HEAT PWR1
F09Spare
F10RR SEAT HEAT PWR2
F11Spare
F12Spare
F13Spare
F14Spare
F15Spare
F16Spare
F17Spare
F18Spare
F19Spare
F20Spare
F21Spare
CB1Spare
RelaysSpare
K01Spare
K02Spare
K03Spare
K04Spare
K05Spare

Step 3: Check the Fuse

Use the plastic fuse puller, typically found in the fuse box, to remove the fuse. Hold it up to a light source. If the metal filament inside is broken or charred, the fuse is bad and needs to be replaced.

Comparison of a good fuse and a blown fuse — the blown fuse has a broken filament

Step 4: How to Get a Replacement

You can buy a replacement fuse at any auto parts store. Make sure you match the **amperage (A)** and **physical size** of the fuse exactly. For example, if you need a 20A fuse, get a 20A fuse.

Step 5: Replace the Fuse

Gently press the new fuse into the empty slot. You should feel a slight click when it's securely in place. Test the affected circuit to confirm it's working again.

What Now?

Fuse Was Blown — What to Buy

Ask at any auto parts store (AutoZone, O'Reilly, Advance Auto) for a blade fuse with the same amperage printed on the old one (e.g., 10A, 15A, 20A). Also match the physical size — mini (most modern cars), standard, or maxi. Replacement fuses cost under $5 and most stores sell assorted packs.

Fuse Looks Fine — Other Causes

If the fuse is intact, the problem isn't a blown fuse. Common alternatives include a bad relay (a click-sized electrical switch), a faulty wiring connection, or a failed component (motor, switch, module). At this point, a mechanic's diagnostic is the most reliable next step.

Frequently Asked Questions

What happens if I put in the wrong amperage fuse?

Higher amperage fuses won't protect the circuit and can cause wiring damage or fire. Lower amperage fuses will blow again immediately. Always match the exact amperage.

Why does my fuse keep blowing?

A repeatedly blown fuse indicates an underlying short circuit or overload. Replacing it again won't fix the root cause — consult a mechanic.

Do I need any tools?

Most cars come with a plastic fuse puller in the fuse box lid. If not, fine-tip needle-nose pliers work. A small flashlight helps.

How do I know what size fuse to buy?

Match the amperage printed on the old fuse (e.g., 10A, 15A, 20A) and the physical blade size (mini, standard, maxi). Auto parts stores carry assorted packs.