Looking for fuse box diagrams for the fifth-generation GMC Sierra lineup, including Sierra Denali, Sierra SLE, and Sierra AT4 ? This article covers model years 2019, 2020, 2021, 2022, 2023, 2024, 2025, and 2026 for GMC Sierra 1500 and 2500 , providing clear details on fuse panel locations , easy-to-read fuse layouts , and complete fuse and relay assignments , so you can find the right circuit faster than your truck warms up on a cold morning.
The left instrument panel fuse block access door is on the driver side edge of the instrument panel.
The right instrument panel fuse block access door is on the passenger side edge of the instrument panel.
To access the back of the block: 1) Push the tab at the top of fuse block down;
Assignment of the fuses in the Engine compartment fuse box
Fuse Data
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No. Description 1 High-beam left 2 High-beam right 3 Headlamp left 4 Headlamp right 6 – 7 – 8 Fog Lamp 9 – 10 – 11 Police Upfitter 12 – 13 Washer Front 14 Washer Rear 15 – 16 – 17 IECL 1 19 DC/AC Inverter 20 IECR 2 (LD)/EBCM 2 (HD) – Electronic Brake Control Module 21 – 22 IECL 2 24 Electronic Brake Control Module 1 25 – 26 – 27 Horn 28 – 29 – 30 – 31 – 32 Rear Window Defogger 33 Heated Mirror 34 Parking Lamp Left 37 – 38 – 39 – 40 Misc ignition 41 Trailer Parking Lamp 42 Park Lamp Right 44 – 45 – 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 Semi Active Damping System 57 Side Blind Zone Alert 58 Starter motor (LD and HD DSL) 60 Active Fuel Management 1 61 Vehicle Emission System 62 Integrated Chassis Control Module/CVS – Canister Vent Solenoid 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/Lower 73 Trailer Stop/Turn Lamp Left 74 Trailer Interface Module 1 75 Diesel Exhaust Fluid Controller 76 Electric RNG BDS 78 Engine Control Module 79 Auxiliary Battery 80 Cabin Cooling Pump 81 Trailer Stop/Turn Lamp Right 82 Trailer Interface Module 2 83 Fuel Tank Zone Module 84 Trailer Brake 85 Engine 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 Aeroshutter
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Assignment of the relays in the Engine compartment fuse box
Fuse Data
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No. Description 5 Headlamp 18 DC/AC inverter 23 Rear window defogger 35 Parking lamp 36 Run/Crank 43 – 59 A/C clutch 64 Starter Motor (LD & HD DSL) 70 Starter Pinion (LD) / Starter Motor (HD Gas) 77 Powertrain
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Assignment of the fuses in the Left Dashboard Fuse Block
Fuse Data
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No. Description F1 Rear Heated Seats Left/ Right F3 – F4 – F5 Multifunction End Gate F6 Heated and Ventilated Seats Left/Right F8 – F9 Passive Entry Passive Start/ Spare F10 – F11 – F12 Passenger Power Seat F13 Export Power Take Off/ Special Equipment Option 1 F14 – F15 – F16 Amplifier F17 – F18 – F20 Endgate F22 Rear Sliding Window F23 – F24 – F25 – F26 – F27 –
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Assignment of the circuit breakers in the Left Dashboard Fuse Block
No. Description CB1 Not Used
Assignment of the relays in the Left Dashboard Fuse Block
Fuse Data
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No. Description K1 Rear Sliding Window Open K2 Rear sliding Window Close K3 Multifunction End Gate Major 1 K4 Multifunction End Gate Major 1 K5 Multifunction End Gate Minor 2 K6 Multifunction End Gate Minor 2 K7 – K8 –
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Assignment of the fuses in the Right Dashboard Fuse Block
Fuse Data
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No. Description 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 Discrete Logic Ignition Switch (DLIS) F20 Ventilated Seats F21 NOT R/C F22 Heated Steering Wheel F23 MISC R/C F24 Power Take Off/Reflective Light Auxiliary Display/ Instrument Panel Cluster/ Central Gateway Module/ Inside Rear View Mirror/ Overhead Console Module Ignition 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 Central Gateway Module (CGM) F41 Infotainment 1 F42 Telematics Connectivity Platform F43 – F44 Active vibration management 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
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Assignment of the circuit breakers in the Right Dashboard Fuse Block
Fuse Data
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No. Description CB1 Accessory Power Outlet 2 CB2 Accessory Power Outlet 1/ Cigarette Lighter CB3 Accessory power outlet 3 CB4 Accessory power outlet 4
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Assignment of the relays in the Right Dashboard Fuse Block
Fuse Data
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No. Description K1 Run/Crank K2 Retained Accessory Power/ Accessory 1 K4 Retained accessory power/ Accessory 2 K5 –
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