Need fuse box diagrams for the fourth-generation GMC Sierra ? This guide covers GMC Sierra 1500, 2500, and 3500 for 2014, 2015, 2016, 2017, and 2018 , showing fuse panel locations , clear fuse layouts , and complete fuse and relay assignments —so you can track down the right fuse without playing hide-and-seek under the hood.
The engine compartment fuse block is in the engine compartment, on the driver side of the vehicle.
Instrument Panel Fuse Block (Left) The left instrument panel fuse block access door is on the driver side edge of the instrument panel.
Instrument Panel Fuse Block (Right) The right instrument panel fuse block access door is on the passenger side edge of the instrument panel.
Assignment of the fuses in the engine compartment (2014-2017)
Fuse Data
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No. Type Description 1 Micro J-Case Fuse Trailer Brake 2 Micro J-Case Fuse Trailer Battery 3 J-Case Fuse Antilock Brake System Pump 4 J-Case Fuse Instrument Panel BEC 1 5 J-Case Fuse Spare 6 J-Case Fuse 4WD Tree 7 J-Case Fuse Spare 8 J-Case Fuse Instrument Panel BEC 2 9 J-Case Fuse Spare 10 J-Case Fuse Rear Window Defogger 11 J-Case Fuse Starter 12 J-Case Fuse Cooling Fan 1 13 J-Case Fuse Cooling Fan 2 14 Mini Fuse (2 Pin) Trailer Stop/Turn Lamps, Left 15 Mini Fuse (2 Pin) Trailer Parking Lamps 16 Mini Fuse (2 Pin) Trailer Back-up Lamp 17 Mini Fuse (2 Pin) Trailer Stop/Turn Lamps, Right 18 Micro Fuse (2 Pin) Fuel Pump 19 Micro Fuse (2 Pin) Integrated Chassis Control Module 20 Micro Fuse (2 Pin) Electronic Suspension Control Module 21 Micro Fuse (2 Pin) Fuel Pump Power Module 22 Micro Fuse (2 Pin) Upfitter Switch 1 23 Micro Fuse (2 Pin) Upfitter 2 24 Micro Fuse (2 Pin) Front Wiper 25 Micro Fuse (2 Pin) Antilock Brake System Valves 26 Micro Fuse (2 Pin) Upfitter SW 2 27 Micro Fuse (2 Pin) Upfitter SW 3 28 Micro Fuse (2 Pin) Parking Lamps, Right 29 Micro Fuse (2 Pin) Parking Lamps, Left 30 Micro Fuse (2 Pin) Upfitter 3 31 Micro Fuse (2 Pin) Upfitter SW 4 32 Micro Fuse (2 Pin) Upfitter 4 33 Micro Fuse (2 Pin) Back-up Lamps 34 Micro Fuse (2 Pin) Engine Control Module Ignition 35 Micro Fuse (2 Pin) Air Conditioning Compressor Clutch 36 Micro Fuse (2 Pin) Heated Mirrors 37 Micro Fuse (2 Pin) Upfitter 1 38 Micro Fuse (2 Pin) Center High-Mounted Stoplamp 39 Micro Fuse (2 Pin) Miscellaneous Ignition 40 Micro Fuse (2 Pin) Transmission Ignition 41 Micro Fuse (2 Pin) Fuel Pump 2 42 Micro Fuse (2 Pin) Cooling Fan Clutch 43 Micro Fuse (2 Pin) Engine 44 Micro Fuse (2 Pin) Fuel Injectors A, Odd 45 Micro Fuse (2 Pin) Fuel Injectors B, Even 46 Micro Fuse (2 Pin) Oxygen Sensor B 47 Micro Fuse (2 Pin) Throttle Control 48 Micro Fuse (2 Pin) Horn 49 Micro Fuse (2 Pin) Fog Lamp 50 Micro Fuse (2 Pin) Oxygen Sensor A 51 Micro Fuse (2 Pin) Engine Control Module 52 Micro Fuse (2 Pin) Interior Heater 53 Micro Fuse (2 Pin) Spare 54 Micro Fuse (2 Pin) Aeroshutter 55 Micro Fuse (2 Pin) Front Washer 56 Micro Fuse (3 Pin) Air Conditioning Compressor / Battery Regulated Voltage Control 57 Micro Fuse (3 Pin) Air Conditioning Compressor Module / Battery Pack 58 Micro Fuse (3 Pin) Transmission Control Module / Engine Control Module 59 Micro Fuse (3 Pin) Headlamps
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Assignment of the relays in the engine compartment (2014-2017)
Fuse Data
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No. Type Description 60 Micro Relay Fuel Pump 61 Micro Relay Upfitter 2 62 Micro Relay Upfitter 3 63 Micro Relay Upfitter 4 64 Micro Relay Trailer Parking Lamps 65 Micro Relay Run/Crank 66 Micro Relay Upfitter 1 67 Micro Relay Fuel Pump 2 68 Micro Relay Air Conditioning Control 69 Micro Relay Starter 70 Micro Relay Rear Window Defogger 71 Micro Relay Engine Control Module 72 Solid State Relay Cooling Fan Clutch
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Assignment of the fuses in the Dashboard Fuse Block (Left) (2014-2017)
Fuse Data
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No. Description 1 Accessory Power Outlet 2 2 SEO Retained Accessory Power 3 Universal Garage Door Opener/lnside Rearview Mirror 6 Body Control Module 3 7 Body Control Module 5 8 Driver Window Switch/Mirror Switch 9 Spare 10 Accessory Power Outlet Retained Accessory Power 11 Accessory Power Outlet Battery 12 Accessory Power Outlet 1/Cigarette Lighter 13 Discrete Logic Ignition Switch 14 Switch Backlighting 17 Body Control Module 1 19 Spare 20 Spare 22 Heater, Ventilation, and Air Conditioning/Auxiliary Heater, Ventilation and Air Conditioning Ignition 23 Instrument Cluster Ignition/Sensing Diagnostic Module Ignition 24 Spare 25 Data Link Connector/Driver Seat Module 26 Passive Entry Passive Start/Heater, Ventilation, and Air Conditioning 27 Spare 28 Spare 29 Park Enable/Electrically Adjustable Pedals 30 SEO 31 Accessory/Run Crank 32 Heated Steering Wheel 33 Spare 34 Instrument Cluster 36 Spare 37 Spare 40 Left Doors 41 Driver Power Seat 43 Left Front Heated/Cooled Seat 44 Right Front Heated/Cooled Seats 45 Spare 49 Retained Accessory Power/Accessory 50 Run/Crank
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Assignment of the fuses and relays in the Dashboard Fuse Block (Right) (2014-2017)
Fuse Data
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No. Description 1 Accessory Power Outlet 3 2 Accessory Power Outlet 4 7 Body Control Module 4 8 Body Control Module 8 9 Rear Seat Entertainment 10 Cargo Lamp 15 Steering Wheel Controls 18 Radio 19 Spare 20 Sunroof 23 Airbag/lnfo 26 Export/Power Take Off/SEO Battery 1 27 Obstacle Detection/USB Ports 28 Body Control Module 2 32 SEO Battery 2 35 AC Inverter 36 Amplifier 37 Spare 39 Rear Sliding Window 42 Right Door Window Motor 43 Front Blower 44 SEO 45 Body Control Module 6 46 Body Control Module 7 47 Passenger Seat 50 Retained Accessory Power/Accessory 51 Rear Sliding Window Open 52 Rear Sliding Window Close
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Assignment of the fuses in the engine compartment (2018)
Fuse Data
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No. Description 1 Trailer brake 2 Trailer battery 3 Antilock brake system pump 4 Instrument panel BEC 1 5 Passenger motorized seat belt 6 4WD transfer case electronic control 7 Electric park brake 8 Instrument panel BEC 2 9 Driver motorized seat belt 10 Rear window defogger 11 Starter 12 Cooling fan 1 13 Cooling fan 2 14 Left trailer stop/ Turn signal lamps 15 Trailer parking lamps 16 Trailer reverse lamps 17 Right trailer stop/ Turn signal lamps 18 Fuel pump 19 Integrated chassis control module 20 Electronic suspension control module 21 Fuel pump power module 22 Upfitter 1 23 Upfitter2 24 Front wiper 25 Antilock brake system valve 26 Upfitter 2 27 Upfitter 3 28 Right parking lamps 29 Left parking lamps 30 Upfitter 3 31 Upfitter 4 32 Upfitter 4 33 Reverse lamps 34 Engine control module/Ignition 35 Air conditioning clutch 36 Heated mirrors 37 Upfitter 1 38 Center high-mounted stoplamp 39 Miscellaneous/ Ignition 40 Transmission/ Ignition 41 Fuel pump 2 42 Cooling fan clutch 43 Engine 44 Fuel injectors A–odd 45 Fuel injectors B–even 46 O2 Sensor B 47 Throttle control 48 Horn 49 Fog lamps 50 O2 Sensor A 51 Engine control module 52 Interior heater 53 Accessory power module/TPM pump 54 Front washer 55 Air conditioning/ Battery regulated voltage control 56 Air conditioning module/ Battery pack 57 Transmission control module/ Engine control module 58 Headlamps 74 Electric running boards (if equipped) 76 Fuel pump prime / MGU motor 77 Cabin pump motor 79 Vacuum pump
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Assignment of the relays in the engine compartment (2018)
Fuse Data
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No. Description 59 Fuel pump 60 Upfitter 2 61 Upfitter 3 62 Upfitter 4 63 Trailer parking lamps 64 Run/Crank 65 Upfitter 1 66 Fuel pump 2 67 Air conditioning control 68 Starter 69 Rear window defogger 70 Engine control module 71 Vacuum pump/ Cooling fan clutch 72 CKT 95 73 CKT 92 75 Fuel pump prime/ MGU motor 78 Vacuum pump switch
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Assignment of the fuses in the Dashboard (Left) (2018)
Fuse Data
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No. Description 1 Accessory power outlet 2 2 Special equipment option/Retained accessory power 3 Universal remote system/lnterior rearview mirror 6 Body control module 3 7 Body control module 5 8 Driver window switch/ Mirror switch 9 Not Used 10 Accessory power outlet/Retained accessory power 11 Accessory power outlet battery 12 Accessory power outlet 1/Cigarette lighter 13 Discrete logic ignition switch 14 Switch backlighting 17 Body control module 1 19 Not Used 20 Not Used 22 Heating, ventilation, and air conditioning/ Auxiliary heating, ventilation, and air conditioning/lgnition 23 Instrument cluster/ Ignition sensing diagnostic module/ Ignition 24 Not Used 25 Data link connector/ Driver seat module 26 Passive entry/Passive start/Heating, ventilation, and air conditioning 27 Not Used 28 Not Used 29 Park enable/ Electrically adjustable pedals 30 Special equipment option 31 Accessory/Run/Crank 32 Heated steering wheel 33 Not Used 34 Instrument cluster 36 Not Used 37 Not Used 38 4WD transfer case electronic control 40 Left doors 41 Driver power seat 43 Left heated, cooled or ventilated seats (if equipped) 44 Right heated, cooled or ventilated seats (if equipped) 45 Not Used
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Assignment of the relays in the Dashboard (Left) (2018)
Fuse Data
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No. Description 49 Retained accessory power 50 Run/Crank
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Assignment of the fuses in the Dashboard (Right) (2018)
Fuse Data
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No. Description 1 Accessory power outlet 3 2 Accessory power outlet 4 7 Body control module 4 8 Body control module 8 9 Rear seat entertainment 10 Cargo lamp 15 Steering wheel controls 18 Radio 19 Not Used 20 Sunroof 23 Airbag/lnfo 26 Export/Power take off/ Special equipment option/Battery 1 27 Obstacle detection/ USB ports 28 Body control module 2 32 Special equipment option/Battery 2 35 Air conditioning inverter 36 Amplifier 37 Battery system 39 Rear sliding window 42 Right door window motor 43 Front blower 44 Special equipment option 45 Body control module 6 46 Body control module 7 47 Passenger seat
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Assignment of the relays in the Dashboard (Right) (2018)
Fuse Data
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No. Description 50 Retained accessory power 51 Rear sliding window open 52 Rear sliding window close
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