2015 GMC Sierra fuse box diagram - StartMyCar (2025)

This Sierra has 3 different fuse boxes:

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

TypeNo.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

TypeNo.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

2015 GMC Sierra fuse box diagram - StartMyCar (12)2015 GMC Sierra fuse box diagram - StartMyCar (13)2015 GMC Sierra fuse box diagram - StartMyCar (14)2015 GMC Sierra fuse box diagram - StartMyCar (15)2015 GMC Sierra fuse box diagram - StartMyCar (16)2015 GMC Sierra fuse box diagram - StartMyCar (17)2015 GMC Sierra fuse box diagram - StartMyCar (18)2015 GMC Sierra fuse box diagram - StartMyCar (19)2015 GMC Sierra fuse box diagram - StartMyCar (20)

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What is a fuse and what types can you find for your Sierra?

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2015 GMC Sierra fuse box diagram - StartMyCar (2025)

FAQs

How do you diagnose a bad fuse box? ›

Common Fusebox Problems To Look Out For
  1. Tripped Circuit Breakers. Signs: Frequent circuit breaker trips resulting in power outages in specific areas of your home. ...
  2. Flickering or Dimming Lights. ...
  3. Continuously Tripping Ground Fault Circuit Interrupters (GFCIs) ...
  4. Buzzing or Sizzling Sounds. ...
  5. Old or Outdated Fuseboxes.
Aug 10, 2023

Show Me More ›
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. Determine from the chart on pages and , or the diagram on the fuse box lid, which fuse or fuses control that device.

Read More ›
What are the main fuses in fuse box? ›

Your fuse box will have two sets of fuses. At the bottom will be 15-amp and 20-amp screw-in fuses with glass faces that are exposed and visible. These fuses will service branch light circuits and outlet circuits. At the top will be 30-amp or 40-amp cartridge main fuses for ovens, laundry rooms, or stoves.

Know More ›
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.

View Details ›
Can a bad fuse box cause no start? ›

Blown fuse – Sometimes the simplest explanation is the best one. A blown fuse in the starter circuit could be the cause of a no-start problem. Broken or corroded wiring – Damaged or dirty wires to the battery or to the starter solenoid (or wires that are loose) can prevent sufficient power from reaching the starter.

Get More Info ›
Can a blown fuse prevent car from starting? ›

In a car, a blown fuse will manifest itself as a minor electrical problem such as the failure of interior lights, radio, indicator, or internal features such as climate control. Sometimes, though, it can be as serious as stopping the car from starting altogether.

Show Me More ›
What fuses are only on when the car is on? ›

A switched fuse, on the other hand, only has power when the car is turned on. The main difference between the two is that a constant fuse provides continuous power even when the car is not in use, while a switched fuse only provides power when the car is running.

Read On ›
How to understand a fuse box? ›

Understanding the Fuse Box Anatomy

If it's a breaker panel, you'll see columns of circuit breaker switches with levers marked ON/OFF. Whenever the breaker trips, it falls back to the 'OFF' side, so you'll simply flip it back to 'ON'. For a fuse panel, you'll basically have a column of fuses lying side by side.

Know More ›
What is engine control unit fuse? ›

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.

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What is the purpose of the ECM fuse? ›

The ECM fuse serves as a protective device for the ECM, safeguarding it from electrical faults that could potentially damage its delicate circuitry. In the event of a power surge or a short circuit, the fuse will blow or break, interrupting the electrical current and preventing it from reaching the ECM.

Continue Reading ›

Where is the fuse for engine? ›

The main fuse box is typically located under the hood, while secondary fuse panels might be inside the car, often near the dashboard or steering wheel. The fuse's wire conductor breaks when the current exceeds the ampere limit, which manufacturers usually define along with different color codes on each fuse.

View More ›
How do I know if my fuse box needs replacing? ›

6 Signs You Need to Upgrade Your Fuse Box
  1. Flickering or dimming lights.
  2. Slight shock or tingling sensation when touching appliances.
  3. Constant burning smell.
  4. Sparking or discolored power outlets.

Get More Info ›
How do I know if I have a blown fuse in my breaker box? ›

Lay a rubber mat on the floor in front of the fuse box and stand on it to protect yourself from electric shock. Open the fuse box door. Inspect each fuse using a flashlight to find the one that is burned or melted (the working fuses will have a clear glass casing but the blown one will look cloudy or blackened).

Continue Reading ›
How do you test a fuse board? ›

If you're using a digital multimeter set to measure resistance, touch the probes together to get an initial reading. Then put the probes on either side of the fuse and check if the reading is similar. If it is, then the fuse works properly. If you get no reading or “OL”, then the fuse has blown.

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