2021 Chevrolet Silverado Fuses and Fuse Box | How to change fuse
The 2021 Chevrolet Silverado has a full electrical system that powers different parts of the car. The fuse, which protects against electrical overloads, is very important to this system. The fuse box, which is placed in a certain spot inside the car, holds these fuses and controls how electricity is sent to all the different parts of the car. If there is a problem with the electricity in a certain circuit, the fuse that goes with it may blow. This stops the flow of electricity and keeps parts from getting damaged. The process of changing a fuse in a 2021 Chevrolet Silverado is simple. Starting point: look at the owner’s instructions to find the exact fuse that goes with the broken part. It’s easy to change the fuse with a new one of the same amperage once it’s been found. This easy but important step makes fixing go more smoothly and makes sure the vehicle’s electrical systems work well. However, it’s important to be careful and follow safety rules when working with fuses to avoid electrical dangers.
2023 CHEVROLET SILVERADO Specs, Price, Features, Mileage And Review
Electrical System
Electrical System Overload
The vehicle has fuses to protect against an electrical system overload. Fuses also protect power devices in the vehicle. Replace a bad fuse with a new one of the identical size and rating. If there is a problem on the road and a fuse needs to be replaced, there are some spare fuses and a fuse puller in the left instrument panel fuse block. The same amperage fuse can also be borrowed. Choose some feature of the vehicle that is not needed to use and replace it as soon as possible.
Headlamp Wiring
An electrical overload may cause the lamps to go on and off, or in some cases to remain off. Have the headlamp wiring checked right away if the lamps go on and off or remain off
Windshield Wipers
If the wiper motor overheats due to heavy snow or ice, the windshield wipers will stop. The wiper function is available immediately after the wiper switch is set to off, and back to on. To protect the wiper motor from overheating, the wipers may slow down when the windshield is dry for a long period. If a period of dry operation, or little moisture, exceeds 10 minutes, the wipers may switch to intermittent operation, and remain there. When moisture is again detected on the windshield, wiper operation will return to the operator-selected speed.
Although the circuit is protected from electrical overload, overload due to heavy snow or ice may cause wiper linkage damage. Always clear ice and heavy snow from the windshield before using the windshield wipers.
If the overload is caused by an electrical problem and not snow or ice, be sure to get it fixed.
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. The 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.
See Accessories and Modifications 0 302 and General Information 0 301. To check a fuse, look at the silver-coloured 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 driver’s side of the vehicle.
Lift the cover to access the fuse block.
Caution
Spilling liquid on any electrical component of 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.
| Fuses | Usage |
| 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) / EBCM2 (HD) |
| 21 | – |
| 22 | IECL 2 |
| 24 | EBCM 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 backup 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 | – |
| 59 | A/C clutch |
| 64 | Starter Motor (LD & HD DSL) |
| 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.
The vehicle may not be equipped with all of the fuses, relays, and features shown.
| Fuses | Usage |
| F1 | Rear heated seats left/right |
| F3 | – |
| F4 | – |
| F5 | Spare/MFEG |
| 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 | AMP |
| F17 | – |
| 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 | – |
| K8 | – |
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.
To access the back of the fuse block:
- Push the tab at the top of the fuse block down.
- Pull the top of the fuse block outward.
- Reverse Steps 1–2 to reinstall.
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 |
| 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 | – |
FAQs
Fuses protect electrical circuits by breaking the circuit if an overload or short circuit occurs.
The fuse box is usually located in the engine compartment or inside the cabin, often near the driver’s side dashboard.
Check for a broken filament inside the fuse or use a test light/multimeter to see if there’s continuity.
A fuse puller (usually included in the fuse box) and replacement fuses of the appropriate amperage.
Yes, it can lead to various electrical problems like malfunctioning lights, power windows, or the radio.
Overloaded circuits, short circuits, or faulty electrical components can cause blown fuses.
The fuse box covers for the recommended amperage ratings.
No, it’s not recommended, as using a higher amperage fuse can lead to damage to the electrical system.
Some vehicles come with spare fuses, but it’s advisable to keep a set of replacements in the car.
Insert the fuse puller over the blown fuse, squeeze, and pull the fuse straight out.
Yes, some fuses have a transparent window, allowing you to see if the filament is intact.
Yes, the fuse box is usually labeled, indicating which fuse corresponds to which system.
Consider seeking professional assistance for a more in-depth diagnosis.
Ensure the ignition is off, use the correct amperage fuse, and follow safety guidelines to prevent electrical hazards.
Avoid overloading circuits, check for damaged wiring, and address electrical issues promptly to prevent future problems.
Useful Link:
View Full PDF: 2021 Chevrolet Silverado User Manual | Auto User Guide
2023 CHEVROLET SILVERADO Specs, Price, Features, Mileage And Review
2021 Chevrolet Silverado Display Instrument Cluster | How to use