2018 - 2022 Chevrolet Express Fuse Box Diagram

2021 Chevy Express Van

Fuses and Circuit Breakers

The wiring circuits in the vehicle are protected from short circuits by a combination of fuses and circuit breakers.
This greatly reduces the chance of damage caused by electrical problems.

Danger
Fuses and circuit breakers are marked with their ampere rating. Do not exceed the specified amperage rating when replacing fuses and circuit breakers. Use of an oversized fuse or circuit breaker can result in a vehicle fire. You and others could be seriously injured or killed.

Warning
Installation or use of fuses that do not meet GM’s original fuse specifications is dangerous. The fuses could fail, and result in a fire. You or others could be injured or killed, and the vehicle could be damaged.

To check a fuse, look at the silver-colored band inside the fuse. If the band is broken or melted, replace the fuse. Be sure to replace a bad fuse with a new one of the identical size and rating.
Fuses of the same amperage can be temporarily borrowed from another fuse location, if a fuse goes out. Replace the fuse as soon as possible.

Engine Compartment Fuse Block

Engine Compartment Fuse Block

The fuse block is in the engine compartment on the driver side of the vehicle.
Vehicles with Upfitter Content See www.gmupfitter.com for upfitter provisions and best practices.

Caution
Spilling liquid on any electrical component on the vehicle may damage it. Always keep the covers on any electrical component.

Engine Compartment Fuse Panel Diagram

 

The vehicle may not be equipped with all of the fuses, relays, and features shown.
Fuses ..  Usage
1 ABS motor
2 ABS module
3 Right trailer stoplamp/ Turn signal lamp
4 –
5 –
6 Fuel system control module/Ignition
7 Body control module 5
8 Body control module 7
9 Body control module 4
10 Instrument cluster
11 Trailer wiring
12 –
13 Interior rear vision camera module
14 Windshield washer
16 Horn
17 Transmission
18 A/C (Air Condituioner)
19 Engine control module battery
20 Left stop/turn cutaway lamp
21 Left stop/turn trailer lamp
22 Right stop/turn cutaway lamp
23 NOX Sensor (Diesel only)
24 Fuel pump
25 Auxiliary power outlet (cigarette Lighter)
26 Body control module 3
27 Special equipment option
28 Airbag
29 Steering wheel sensor
30 Engine control module ignition
31 Transmission control module Ignition

32 Transmission control module 1 battery
33 Rear parking aid module
34 NOX Sensor (Diesel only)
35 Fuel heater control module (Diesel only)
36 Fuel system control module battery
41 Transmission control module 2, battery signal
42 Trailer wiring
43 Electro viscous fan clutch (Diesel only)
44 Starter solenoid
45 Engine control module, powertrain signal 2
46 DC - AC inverter
47 – (2018 Model - Cooling fan – low)
51 Left high-beam headlamp

52 Right high-beam headlamp
53 Left low-beam headlamp
54 Right low-beam headlamp
55 Wipers
56 Canister vent solenoid
58 Body control module 2
59 Body control module 1
61 Engine oil solenoid/ Crankcase vent heater (Diesel only)
62 O2 sensor 2
63 –
64 Mass airflow/ Canister vent
65 Ignition coils/injectors - odd
66 Daytime running lamps (DRL) 2
67 Daytime running lamps 1

68 Auxiliary stoplamps
69 External power for trailer
70 Upfitter stoplamps
71 Fuel heater/FlexFuel sensor
72 Body control module 6
73 Lighter/Data link connector
74 Front blower
75 Engine control module
76 Soot sensors (Diesel only)
77 O2 sensor 1
78 Engine control module/ Powertrain signal 1
79 Ignition coils/injectors - even

Relays  ... Usage
15 Run/Crank
37 NOX Sensor (Diesel only)
38 Fuel pump
39 Crank
40 A/C (Air Conditioner) compressor
48 Electro viscous fan clutch (Diesel only)
49 Powertrain
50 –
57 – (2018 Model - Cooling fan – low)
60 – (2018 Model - Cooling fan control)

Auxiliary Fuse Block

Auxiliary Fuse Panel Diagram

This component is near the fuse block in the engine compartment

Fuses  ... Usage
MR-1 Upfitter 1
MR-2 Upfitter 2
MR-3 Upfitter power control

Relays .. Usage
MR Rel 1 Upfitter 1
MR Rel 2 Upfitter 2

 

Mega Fuse Holder (2018 - 2021 Mode

Mega Fuse Holder

Fuse  ... Usage
1 Starter motor

Floor Console Fuse Block

The floor console fuse block is under the driver seat.
 

The vehicle may not be equipped with all of the fuses, relays, and features shown.

Mini-Fuses  .. Usage
F1 –
F2 Steering wheel sensor
F3 Auxiliary parking lamps
F4 Front parking lamps
F5 Trailer parking lamps
F6 Upfitter/Parking lamps
F7 Right rear parking lamp
F8 Left rear parking lamp
F9 Exterior rear mirror switch/ Door lock-unlock control upfitter/Front camera module
F10 Airbag/Automatic occupant sensing
F11 – /OnStar
F12 – (2018 Model - ECM batt [Emgine Control Module Battery])
F13 HVAC (Heating, ventilation, and air conditioning)  2
F14 HVAC 1
F15 Reflected LED display (2018 Model - Empty)

F16 Upfitter aux 1/Gas ambulance
F17 Heated outside mirrors
F18 Rear window defogger
F19 Compass
F20 Radio/Chime/SiriusXM satellite radio
F21 Remote function actuator/Tire pressure monitor
F22 Ignition switch/Discrete logic ignition sensor
F23 Instrument cluster
F24 –
F25 HVAC (Heating, ventilation, and air conditioning) control
F26 Auxiliary/Trailer reverse lamps
F27 Reverse tail lamps
F28 Upfitter 2/Reading lamps/Ambulance
F29 Rear blower
F30 Upfitter/Courtesy lamps
F31 Front door lock
F32 Rear door lock
F33 Cargo door unlock
F34 Front passenger door unlock
F35 Rear passenger door unlock
F36 Driver door unlock
F37 –
F38 –

Relays ... Usage
K1 Run
K2 –
K3 Parking lamps
K4 Upfitter 2
K5 Rear window defogger
K6 Retained accessory power

Circuit Breakers  ... Usage
CB1 Power seats
CB2 Power windows