2019 - 2021 GMC Sierra 1500 Fuse Box Diagram

 

2021 GMC Sierra 1500

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

If the vehicle has a diesel engine, see the Duramax diesel supplement.
The engine compartment fuse block is in the engine compartment, on the passenger side
of the vehicle.

Lift the cover to access the fuse block.

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

A fuse puller is available in the left instrument panel end cap. The vehicle may not be equipped with all of the fuses, relays, and features shown.

Engine Compartment Fuse Panel Diagram

Fuses ..  Usage
1 High-beam left
2 High-beam right
3 Headlamp left
4 Headlamp right
6 TIM
7 –
8 Fog lamp
9 –
10 –
11 Police upfitter
12 –
13 Washer front
14 Washer rear
15 MSB driver
16 –
17 IECL 1
19 DC/AC inverter
20 IECR 2 (LD) / EBCM2 (HD)
21 MSB pass
22 IECL 2
24 EBCM 1
25 REC
26 –
27 Horn
28 –
29 –
30 –
31 –
32 Rear window defogger
33 Heated mirror
34 Parking lamp left
37 Euro trailer
38 TIM
39 –
40 Misc ignition
41 Trailer parking lamp
42 Park lamp right
44 –
45 Second fuel pump
46 Engine control module ignition
47 Transmission control module ignition

48 –
49 Transmission control module
50 A/C clutch
51 Transfer case control module
52 Front wiper
53 Center high-mounted stop lamp
54 Trailer reverse lamp
55 Trailer back-up lamp
56 SADS
57 TTPM
58 Starter motor (LD & HD DSL)
60 Active fuel management 1
61 VES
62 Integrated chassis control module/CVS
63 Trailer battery

65 Auxiliary underhood electrical center
66 Cooling fan motor left
67 Active fuel management 2
68 –
69 Starter Pinion (LD) / Starter Motor (HD Gas)
71 Cooling fan
72 Cooling fan right
73 Trailer stop/turn lamp left
74 TIM
75 DEFC
76 Electric RNG BDS
78 Engine control module
79 Auxiliary battery
80 Cabin cooling pump
81 Trailer stop/turn lamp right
82 TIM

83 FTZM
84 Trailer brake
85 ENG
86 Engine control module
87 Injector B even
88 O2 B sensor
89 O2 A sensor
90 Injector A odd
91 Engine control module throttle control
92 Cool fan clutch

Relays .. Usage
5 Headlamp
18 DC/AC inverter
23 Rear window defogger
35 Parking lamp
36 Run/Crank
43 Second fuel pump
59 A/C clutch
64 Starter Motor (LD & HD DSL) / Cool Fan Clutch (HD Gas)
70 Starter Pinion (LD) / Starter Motor (HD Gas)
77 Powertrain

Instrument Panel Fuse Block (Left)

The left instrument panel fuse block access door is on the driver side edge of the instrument panel.
The vehicle may not be equipped with all of the fuses, relays, and features shown.

Pull off the cover to access the fuse block. A fuse puller is available in the left instrument panel end cap.

Instrument Fuse Panel Diagram - Left

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

Fuses .. Usage
F1 Rear heated seats left/right
F3 – (2019 - 2020 Models - Euro trailer)
F4 –
F5 Spare/MFEG (2019 - 2020 Models - Front Bolster)
F6 Heated and ventilated seats left/right
F8 –
F9 Passive entry passive start/ Spare
F10 –
F11 – (2019 - 2020 Models - Sunshade)
F12 Passenger power seat
F13 Export power take off/ Special equipment option 1
F14 –
F15 –
F16 AMP
F17 – (2019 - 2020 Models - MPEG)
F18 –
F20 Endgate
F22 Rear sliding window
F23 –
F24 –
F25 –
F26 –
F27 –

Circuit Breakers .. Usage
CB1 –

Relays Usage
K1 Rear sliding window open
K2 Rear sliding window close
K3 MFEG major 1
K4 MFEG minor 1
K5 MFEG minor 2
K6 MFEG major 2
K7 – (2019 - 20202 Models -  Anti-theft)
K8 –

Instrument Panel Fuse Block (Right)

Instrument Panel Fuse Block  - Right

The right instrument panel fuse block access door is on the passenger side edge of the
instrument panel.
Pull off the cover to access the front of the fuse block.

Instrument Fuse Panel Diagram - Right

To access the back of the fuse block:

Instrument Panel Fuse Block  - Right Back

 

1. Push the tab at the top of fuse block down.
2. Pull the top of the fuse block outward.
3. Reverse Steps 1–2 to reinstall.

Instrument Fuse Panel Diagram - Right Back

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

Fuses .. Usage
F1 Right doors
F2 Left doors
F3 Universal garage door opener
F4 –
F5 –
F6 Front blower
F8 Lumbar switch
F10 Body control module 6/ Body control module 7
F11 Seat/Column lock module
F12 Body control module 3/ Body control module 5
F14 Mirrors/Windows module
F17 Steering wheel controls
F18 Video processing module/ Obstacle detection
F19 DLIS
F20 Ventilated seats
F21 NOT R/C
F22 Heated steering wheel

F23 MISC R/C
F24 Instrument panel cluster ignition/Overhead
F25 Heating, ventilation, and air conditioning ignition/ Heating, ventilation, and air conditioning auxiliary
F26 USB ports/Special equipment option retained accessory power
F27 Accessory power outlet/ retained accessory power
F28 Accessory power outlet/ Battery
F30 Sensing and diagnostic module/Parking brake
F31 Body control module 4
F32 Special equipment option/ Data link connection
F33 Body control module 8
F34 Cargo lamp
F40 CGM
F41 Infotainment 1

F42 TCP
F43 –
F44 Active vibration management (AVM)
F45 Body control module 2
F46 Heating, ventilation, and air conditioning/Battery 1
F47 Instrument panel cluster/ Battery
F48 Transmission control module
F49 Body control module 1
F50 –
F51 Battery 1
F52 Battery 2
F53 –
F54 Sunroof
F55 Driver power seat
F56 DC DC TRANS 1
F57 DC DC TRANS 2
F58 Infotainment 2

Circuit Breakers .. Usage
1 Accessory power outlet 2
2 Accessory power outlet 1/ Cigarette Lighter
3 Accessory power outlet 3
4 Accessory power outlet 4

Relays .. Usage
K1 Run/Crank
K2 Retained accessory power/ Accessory 1
K4 Retained accessory power/ Accessory 2
K5 –