2015 GMC Sierra fuse box diagram

The 2015 GMC Sierra has 3 different fuse boxes:

Engine Compartment Fuse Block diagramInstrument Panel Fuse Block (Left) diagramInstrument Panel Fuse Block (Right) diagram

Type	No.	Description
Fuse FMM/MCase	1	Trailer Brake
Fuse FMM/MCase	2	Trailer Battery
Fuse FMX/JCase	3	Antilock Brake System Pump
Fuse FMX/JCase	4	Instrument Panel BEC 1
Fuse FMX/JCase	5	Spare
Fuse FMX/JCase	6	4WD Trec
Fuse FMX/JCase	7	Spare
Fuse FMX/JCase	8	Instrument Panel BEC 2
Fuse FMX/JCase	9	Spare
Fuse FMX/JCase	10	Rear Window Defogger
Fuse FMX/JCase	11	Starter
Fuse FMX/JCase	12	Cooling Fan 1
Fuse FMX/JCase	13	Cooling Fan 2
Fuse MICRO2	14	Trailer Stop/Turn Lamps, Left
Fuse MICRO2	15	Trailer Park Lamps
Fuse MICRO2	16	Trailer Back-up Lamp
Fuse MICRO2	17	Trailer Stop/Turn Lamps, Right
Fuse MICRO2	18	Fuel Pump
Fuse MICRO2	19	Integrated Chassis Control Module
Fuse MICRO2	20	Electronic Suspensión Control Module
Fuse MICRO2	21	Fuel Pump Power Module
Fuse MICRO2	22	Upfitter Switch 1
Fuse MICRO2	23	Upfitter 2
Fuse MICRO2	24	Front Wiper
Fuse MICRO2	25	Antilock Brake System Valves
Fuse MICRO2	26	Upfitter SW 2
Fuse MICRO2	27	Upfitter SW 3
Fuse MICRO2	28	Parking Lamps, Right
Fuse MICRO2	29	Parking Lamps, Left
Fuse MICRO2	30	Upfitter 3
Fuse MICRO2	31	Upfitter SW 4
Fuse MICRO2	32	Upfitter 4
Fuse MICRO2	33	Back-up Lamps
Fuse MICRO2	34	Engine Control Module Ignition
Fuse MICRO2	35	Air Conditioning Compressor Clutch
Fuse MICRO2	36	Heated Mirrors
Fuse MICRO2	37	Upfitter 1
Fuse MICRO2	38	Center High-Mounted Stoplamp
Fuse MICRO2	39	Miscellaneous Ignition
Fuse MICRO2	40	Transmission Ignition
Fuse MICRO2	41	Fuel Pump 2
Fuse MICRO2	42	Cooling Fan Clutch
Fuse MICRO2	43	Engine
Fuse MICRO2	44	Fuel Injectors A, Odd
Fuse MICRO2	45	Fuel Injectors B, Even
Fuse MICRO2	46	Oxygen Sensor B
Fuse MICRO2	47	Throttle Control
Fuse MICRO2	48	Horn
Fuse MICRO2	49	Fog Lamp
Fuse MICRO2	50	Oxygen Sensor A
Fuse MICRO2	51	Engine Control Module
Fuse MICRO2	52	Interior Heater
Fuse MICRO2	53	Spare
Fuse MICRO2	54	Aeroshutter
Fuse MICRO3	55	Front Washer
Fuse MICRO3	56	Air Conditioning Compressor/ Battery Regulated Voltage Control
Fuse MICRO3	57	Air Conditioning Compressor Module/ Battery Pack
Fuse MICRO3	58	Transmission Control Module/ Engine Control Module
Relay	59	Headlamps
Relay	60	Fuel Pump
Relay	61	Upfitter 2
Relay	62	Upfitter 3
Relay	63	Upfitter 4
Relay	64	Trailer Park Lamps
Relay	65	Run/Crank
Relay	66	Upfitter 1
Relay	67	Fuel Pump 2
Relay	68	Air Conditioning Control
Relay	69	Starter
Relay	70	Rear Window Defogger
Relay	71	Engine Control Module
Fuse MICRO2	72	Cooling Fan Clutch

Type	No.	Description
Fuse FMM/MCase	1	Accessory Power Outlet 2
Fuse MICRO2	2	SEO Retained Accessory Power
Fuse MICRO2	3	Universal Garage Door Opener/Inside Rearview Mirror
Fuse MICRO2	6	Body Control Module 3
Fuse MICRO2	7	Body Control Module 5
Fuse MICRO2	8	Driver Window Switch/Mirror Switch
Fuse MICRO2	9	Spare
Fuse FMX/JCase	10	Accessory Power Outlet Retained Accessory Power
Fuse FMX/JCase	11	Accessory Power Outlet Battery
Fuse FMM/MCase	12	Accessory Power Outlet 1/Cigarette Lighter
Fuse MINI	13	Discrete Logic Ignition Switch
Fuse MINI	14	Switch Backlighting
Fuse MICRO2	17	Body Control Module 1
Fuse FMM/MCase	19	Spare
Fuse FMM/MCase	20	Spare
Fuse MICRO3	22	Heater, Ventilation and Air Conditioning/ Auxiliary Heater, Ventilation and Air Conditioning Ignition
Fuse MICRO3	23	Instrument Cluster Ignition/Sensing Diagnostic Module Ignition
Fuse MICRO3	24	Spare
Fuse MICRO3	25	Data Link Connector/Driver Seat Module
Fuse MICRO3	26	Passive Entry Passive Start/Heater, Ventilation and Air Conditioning
Fuse MICRO2	27	Spare
Fuse MICRO2	28	Spare
Fuse MICRO2	29	Park Enable/ Electrically Adjustable Pedals
Fuse MICRO2	30	SEO
Fuse MICRO2	31	Accessory/Run Crank
Fuse MICRO2	32	Heated Steering Wheel
Fuse MICRO2	33	Spare
Fuse MICRO2	34	Instrument Cluster
Fuse MICRO2	36	Spare
Fuse FMM/MCase	37	Spare
Fuse FMM/MCase	40	Left Doors
Fuse FMM/MCase	41	Driver Power Seat
Fuse MICRO2	43	Left Front Heated/ Cooled Seat
Fuse MICRO2	44	Right Front Heated/Cooled Seats
Fuse MICRO2	45	Spare
Relay	49	Retained Accessory Power/Accessory
Relay	50	Run/Crank

Type	No.	Description
Fuse FMM/MCase	1	Accessory Power Outlet 3
Fuse FMM/MCase	2	Accessory Power Outlet 4
Fuse MICRO2	7	Body Control Module 4
Fuse MICRO2	8	Body Control Module 8
Fuse MICRO2	9	Rear Seat Entertainment
Fuse MICRO2	10	Cargo Lamp
Fuse MINI	15	Steering Wheel Controls
Fuse MICRO2	18	Radio
Fuse MICRO2	19	Spare
Fuse FMM/MCase	20	Sunroof
Fuse MICRO3	23	Airbag/Info
Fuse MICRO3	26	Export/Power Take Off/SEO Battery 1
Fuse MICRO3	27	Obstacle Detection/ USB Ports
Fuse MICRO2	28	Body Control Module 2
Fuse MICRO2	32	SEO Battery 2
Fuse MICRO2	35	AC Inverter
Fuse MICRO2	36	Amplifier
Fuse MICRO2	37	Spare
Fuse FMM/MCase	39	Rear Sliding Window
Fuse FMM/MCase	42	Right Door Window Motor
Fuse FMX/JCase	43	Front Blower
Fuse MICRO2	44	SEO
Fuse MICRO2	45	Body Control Module 6
Fuse MICRO2	46	Body Control Module 7
Fuse FMM/MCase	47	Passenger Seat
Relay	50	Retained Accessory Power/Accessory
Relay	51	Rear Sliding Window Open
Relay	52	Rear Sliding Window Close

GMC Sierra fuse box diagrams change across years, pick the right year of your vehicle:

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Source: GMC Sierra 2015 Owner's Manual

FAQs

Why is my 2015 GMC Sierra not starting? ›

Check the battery and fuses first! Be sure to have about 12.6 volts with the key turned on. Jumpstart/recharge the battery if needed. Check all of the fuses on the vehicle with the ignition turned on and replace any that might have failed.

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Where is the secondary engine compartment fuse box? ›

The secondary under-hood fuse box is next to the battery. To open it, push the tabs as shown. If something electrical in your vehicle stops working, check for a blown fuse first.

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What is the engine room fuse box? ›

There are two fuse boxes, one located near the engine or under the hood and the other is located near the driver seat. The car fuse box under the hood protects engine components including engine control unit (ECU), cooling fan, ABS motor and battery.

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Where is the headlight relay on a 2015 GMC Sierra? ›

The 2015 GMC sierra headlight relay location is the fuse box.To get to the fuse box look to the left of the steering wheel look for a small seam or crack along the dash. Using a screwdriver or prybar You will want to pop this open.

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Why is my truck not starting but has power? ›

A low battery is the most frequent cause of a car having power but not turning over. Other causes include a bad starter, a bad alternator, or electrical issues. If you hear clicking, whirring, or nothing at all when trying to start your car, you may have a bad starter, malfunctioning alternator, or low battery.

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What causes GMC Sierra to not start? ›

The most common reasons a GMC Sierra 1500 won't start are a dead battery, an alternator problem, or failed starter.

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How do I know if my engine compartment fuse is blown? ›

Still gripping it with the puller, hold the fuse up to the light (or a light source) and look through the translucent bodywork. You should see a thin metal wire in there. If the wire is no longer a continuous thread and appears broken or in two pieces, the fuse has indeed 'blown'.

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What does the engine management fuse do? ›

Well, you see, that fuse protects the ECU (Engine control unit or ECM engine control module) from over amperage's. So if there's an electrical surge, the brain is protected. On a newer model car the ECU/ECM controls everything ignition related AT LEAST. Timing, ignition, air.

Where is the main engine fuse located? ›

Engine fuse boxes are typically situated near the battery. In this vehicle, the battery is on the driver's side, and there is a fuse box right above it with a black plastic cover to protect the fuses. On the passenger side, there is also a battery, and the fuse box is located nearby.

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Where is the headlight relay fuse? ›

The headlight relay is typically located in the power distribution box in the engine compartment. Consult your owner's manual if you need help finding the relay. How Much to Replace a Headlight Relay? Replacing a headlight relay is a DIY-friendly repair that you can usually do yourself.

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How do you diagnose a bad headlight switch? ›

Common Signs of a Faulty Headlight Switch

Problems When Switching Headlight Modes: A clear indication of a faulty headlight switch is difficulty in switching between different headlight modes. You might notice that the switch only functions in certain positions or causes the headlights to flicker or blink.

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Why is my car not starting suddenly? ›

It could be a minor glitch in the battery terminals, a dead battery, a defective ignition switch and so on. Car starting problems are mainly related to the battery, car self-start system or fuel lines. Below are some of the common reasons why your car is not starting upon switching on the ignition.

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Why does my truck not start randomly? ›

The most common reason cars don't start is a dead or faulty battery. Even though most cars run on gasoline, they all require electrical power to function. The starter that cranks your engine to start requires an electrical signal to fire. If something's wrong with your battery, your car engine won't turn over.

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Why won't my truck start when I turn the key? ›

If you attempt to start up your car but the engine won't turn over and the dashboard lights up, then you most likely have an issue with your battery. You could have a damaged or corroded battery terminal, which is stopping the engine from starting up when you fully turn the key.

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Why does my Chevy truck have power but wont start? ›

A non-starting vehicle can signal anything from a drained battery or a faulty ignition system to fuel delivery problems. Identifying the root cause is the first step in getting your trusted truck back to its optimal condition.

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2015 GMC Sierra fuse box diagram - StartMyCar (2024)

FAQs

Why is my 2015 GMC Sierra not starting? ›

How do you diagnose a bad headlight switch? ›