2021 GMC Sierra 1500 HD Chassis Computer

2021 GMC Sierra 1500 HD Chassis Computer (No parts in stock)
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Chassis Computer (Not Actual Photo)
Summary
Year: 2021change
Make: GMCchange
Model: Sierra 1500 HDchange
Item: Chassis Computer
Condition: OEM Used
Items Available: 0
Price Range: N/A
Local Discount: N/A
Returns: Cancellation & Return Policy
Item: Chassis Computer change
Condition: OEM Usedchange
Items Available: 0
Price Range: N/A
Local Discount: N/A
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Select the right Chassis Computer for your 2021 GMC Sierra 1500 HD

This part may have multiple fitment options depending on your vehicle's engine, drivetrain, and configuration. To ensure proper compatibility, please select the correct fitment below. If you’re unsure, we strongly recommend checking your VIN or vehicle build details before ordering. You can update or change the fitment selection at any time.

Chassis Computer - SIERRA 1500 PICKUP Air Bag (Passenger Side rear floor)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Air Bag (Passenger Side rear floor)
Items in stock: 438
Chassis Computer - SIERRA 1500 PICKUP Body Control (BCM) (under steering wheel mounted)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Body Control (BCM) (under steering wheel mounted)
Items in stock: 471
Chassis Computer - SIERRA 1500 PICKUP Communication (telematics, OnStar, left hand dash) ID 84833055
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Communication (telematics, OnStar, left hand dash) ID 84833055
Items in stock: 289
Chassis Computer - SIERRA 1500 PICKUP Communication (telematics, OnStar, left hand dash) ID 84960632
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Communication (telematics, OnStar, left hand dash) ID 84960632
Items in stock: 2
Chassis Computer - SIERRA 1500 PICKUP Communication (telematics, OnStar, left hand dash) ID 84967568
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Communication (telematics, OnStar, left hand dash) ID 84967568
Items in stock: 289
Chassis Computer - SIERRA 1500 PICKUP Communication (telematics, OnStar, left hand dash) ID 85124234
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Communication (telematics, OnStar, left hand dash) ID 85124234
Items in stock: 11
Chassis Computer - SIERRA 1500 PICKUP Communication (telematics, OnStar, left hand dash) ID 85129541
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Communication (telematics, OnStar, left hand dash) ID 85129541
Items in stock: 289
Chassis Computer - SIERRA 1500 PICKUP Communication (telematics, OnStar, left hand dash) ID 85527366
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Communication (telematics, OnStar, left hand dash) ID 85527366
Items in stock: 289
Chassis Computer - SIERRA 1500 PICKUP Communication (telematics, OnStar, left hand dash) ID 85543261
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Communication (telematics, OnStar, left hand dash) ID 85543261
Items in stock: 289
Chassis Computer - SIERRA 1500 PICKUP Communication (telematics, OnStar, left hand dash) ID 86815701
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Communication (telematics, OnStar, left hand dash) ID 86815701
Items in stock: 289
Chassis Computer - SIERRA 1500 PICKUP Door (tailgate control)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Door (tailgate control)
Items in stock: 34
Chassis Computer - SIERRA 1500 PICKUP Driver Side Assist TPMS (mounted behind rear bumper)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Driver Side Assist TPMS (mounted behind rear bumper)
Items in stock: 18
Chassis Computer - SIERRA 1500 PICKUP Driver Side Assist camera (Passenger Side cab back panel) opt UVN (bed view camera) ID 84837973
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Driver Side Assist camera (Passenger Side cab back panel) opt UVN (bed view camera) ID 84837973
Items in stock: 5
Chassis Computer - SIERRA 1500 PICKUP Driver Side Assist camera (Passenger Side cab back panel) opt UVN (bed view camera) ID 84995709
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Driver Side Assist camera (Passenger Side cab back panel) opt UVN (bed view camera) ID 84995709
Items in stock: 2
Chassis Computer - SIERRA 1500 PICKUP Driver Side Assist camera (Passenger Side cab back panel) opt UVS (360 view, digital camera)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Driver Side Assist camera (Passenger Side cab back panel) opt UVS (360 view, digital camera)
Items in stock: 3
Chassis Computer - SIERRA 1500 PICKUP Driver Side Assist park assist (Passenger Side cab back panel)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Driver Side Assist park assist (Passenger Side cab back panel)
Items in stock: 124
Chassis Computer - SIERRA 1500 PICKUP Fuel Pump (Passenger Side rear frame rail)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Fuel Pump (Passenger Side rear frame rail)
Items in stock: 495
Chassis Computer - SIERRA 1500 PICKUP Memory (under Driver Side seat)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Memory (under Driver Side seat)
Items in stock: 1480
Chassis Computer - SIERRA 1500 PICKUP Network Gateway (left hand rear engine compartment)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Network Gateway (left hand rear engine compartment)
Items in stock: 679
Chassis Computer - SIERRA 1500 PICKUP Power Supply (behind rear seat)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Power Supply (behind rear seat)
Items in stock: 141
Chassis Computer - SIERRA 1500 PICKUP Steering (steering mounted) ID 13524104
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Steering (steering mounted) ID 13524104
Items in stock: 112
Chassis Computer - SIERRA 1500 PICKUP Steering (steering mounted) ID 13535112
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Steering (steering mounted) ID 13535112
Items in stock: 112
Chassis Computer - SIERRA 1500 PICKUP Steering (steering mounted) ID 84836986
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Steering (steering mounted) ID 84836986
Items in stock: 21
Chassis Computer - SIERRA 1500 PICKUP Suspension (rear frame)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Suspension (rear frame)
Items in stock: 94
Chassis Computer - SIERRA 1500 PICKUP Temperature (Passenger Side under dash) ID 84579087
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Temperature (Passenger Side under dash) ID 84579087
Items in stock: 162
Chassis Computer - SIERRA 1500 PICKUP Temperature (Passenger Side under dash) ID 84579089
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Temperature (Passenger Side under dash) ID 84579089
Items in stock: 12
Chassis Computer - SIERRA 1500 PICKUP Theft-Locking door lock control (back glass left hand frame)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Theft-Locking door lock control (back glass left hand frame)
Items in stock: 52
Chassis Computer - SIERRA 1500 PICKUP Theft-Locking keyless entry (left hand under dash)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Theft-Locking keyless entry (left hand under dash)
Items in stock: 470
Chassis Computer - SIERRA 1500 PICKUP Theft-Locking theft deterrent remote start (opt AVJ) (under floor console)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Theft-Locking theft deterrent remote start (opt AVJ) (under floor console)
Items in stock: 41
Chassis Computer - SIERRA 1500 PICKUP Theft-Locking theft deterrent Without remote start (Automatic Transmission top of steering column)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Theft-Locking theft deterrent Without remote start (Automatic Transmission top of steering column)
Items in stock: 35
Chassis Computer - SIERRA 1500 PICKUP Towing Control (behind left hand bumper) tow package
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Towing Control (behind left hand bumper) tow package
Items in stock: 85
Chassis Computer - SIERRA 1500 PICKUP Towing Control (behind left hand bumper) trailer lamp control
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Towing Control (behind left hand bumper) trailer lamp control
Items in stock: 8
Chassis Computer - SIERRA 1500 PICKUP Transfer Case (left hand inner fender)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Transfer Case (left hand inner fender)
Items in stock: 273
Chassis Computer - SIERRA 1500 PICKUP Transmission Control (left hand core support)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA 1500 PICKUP Transmission Control (left hand core support)
Items in stock: 157
Chassis Computer - SIERRA DENALI 1500 Air Bag (Passenger Side rear floor)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA DENALI 1500 Air Bag (Passenger Side rear floor)
Items in stock: 438
Chassis Computer - SIERRA DENALI 1500 Body Control (BCM) (under steering column)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA DENALI 1500 Body Control (BCM) (under steering column)
Items in stock: 471
Chassis Computer - SIERRA DENALI 1500 Door (tailgate control)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA DENALI 1500 Door (tailgate control)
Items in stock: 34
Chassis Computer - SIERRA DENALI 1500 Driver Side Assist camera (Passenger Side cab back panel) opt UVN (bed view camera) ID 84837973
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA DENALI 1500 Driver Side Assist camera (Passenger Side cab back panel) opt UVN (bed view camera) ID 84837973
Items in stock: 5
Chassis Computer - SIERRA DENALI 1500 Driver Side Assist camera (Passenger Side cab back panel) opt UVN (bed view camera) ID 84995709
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA DENALI 1500 Driver Side Assist camera (Passenger Side cab back panel) opt UVN (bed view camera) ID 84995709
Items in stock: 2
Chassis Computer - SIERRA DENALI 1500 Driver Side Assist camera (Passenger Side cab back panel) opt UVS (360 view, digital camera)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA DENALI 1500 Driver Side Assist camera (Passenger Side cab back panel) opt UVS (360 view, digital camera)
Items in stock: 3
Chassis Computer - SIERRA DENALI 1500 Driver Side Assist park assist (Passenger Side cab back panel)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA DENALI 1500 Driver Side Assist park assist (Passenger Side cab back panel)
Items in stock: 124
Chassis Computer - SIERRA DENALI 1500 Fuel Pump (Passenger Side rear frame rail)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA DENALI 1500 Fuel Pump (Passenger Side rear frame rail)
Items in stock: 495
Chassis Computer - SIERRA DENALI 1500 Memory (under Driver Side seat)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA DENALI 1500 Memory (under Driver Side seat)
Items in stock: 1480
Chassis Computer - SIERRA DENALI 1500 Network Gateway (left hand rear engine compartment)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA DENALI 1500 Network Gateway (left hand rear engine compartment)
Items in stock: 679
Chassis Computer - SIERRA DENALI 1500 Power Supply (behind rear seat)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA DENALI 1500 Power Supply (behind rear seat)
Items in stock: 141
Chassis Computer - SIERRA DENALI 1500 Stability Control (yaw rate control, center floor)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA DENALI 1500 Stability Control (yaw rate control, center floor)
Items in stock: 0
Chassis Computer - SIERRA DENALI 1500 Steering (steering mounted) ID 13524104
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA DENALI 1500 Steering (steering mounted) ID 13524104
Items in stock: 112
Chassis Computer - SIERRA DENALI 1500 Steering (steering mounted) ID 13535112
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA DENALI 1500 Steering (steering mounted) ID 13535112
Items in stock: 112
Chassis Computer - SIERRA DENALI 1500 Steering (steering mounted) ID 84836986
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA DENALI 1500 Steering (steering mounted) ID 84836986
Items in stock: 21
Chassis Computer - SIERRA DENALI 1500 Suspension (rear frame)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA DENALI 1500 Suspension (rear frame)
Items in stock: 94
Chassis Computer - SIERRA DENALI 1500 Temperature (Passenger Side under dash) ID 84579087
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA DENALI 1500 Temperature (Passenger Side under dash) ID 84579087
Items in stock: 162
Chassis Computer - SIERRA DENALI 1500 Temperature (Passenger Side under dash) ID 84579089
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA DENALI 1500 Temperature (Passenger Side under dash) ID 84579089
Items in stock: 12
Chassis Computer - SIERRA DENALI 1500 Theft-Locking door lock control (back glass left hand frame)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA DENALI 1500 Theft-Locking door lock control (back glass left hand frame)
Items in stock: 52
Chassis Computer - SIERRA DENALI 1500 Theft-Locking theft deterrent remote start (opt AVJ) (under floor console)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA DENALI 1500 Theft-Locking theft deterrent remote start (opt AVJ) (under floor console)
Items in stock: 41
Chassis Computer - SIERRA DENALI 1500 Theft-Locking theft deterrent Without remote start (Automatic Transmission top of steering column)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA DENALI 1500 Theft-Locking theft deterrent Without remote start (Automatic Transmission top of steering column)
Items in stock: 35
Chassis Computer - SIERRA DENALI 1500 Towing Control (behind left hand bumper) tow package
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA DENALI 1500 Towing Control (behind left hand bumper) tow package
Items in stock: 85
Chassis Computer - SIERRA DENALI 1500 Towing Control (behind left hand bumper) trailer lamp control
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA DENALI 1500 Towing Control (behind left hand bumper) trailer lamp control
Items in stock: 8
Chassis Computer - SIERRA DENALI 1500 Transfer Case (left hand inner fender)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA DENALI 1500 Transfer Case (left hand inner fender)
Items in stock: 273
Chassis Computer - SIERRA DENALI 1500 Transmission Control (left hand core support)
Select Fitment This fitment option is for 2021 GMC Sierra 1500 HD, select this option for SIERRA DENALI 1500 Transmission Control (left hand core support)
Items in stock: 157

Interchange Fitment FAQs

Q: How does interchange fitment work for my 2021 GMC Sierra 1500 HD Chassis Computer?

A: All Chassis Computer options shown on this page are matched to your selected configuration: 2021 GMC Sierra 1500 HD. Used OEM parts are dismantled from donor vehicles as complete assemblies, and a specific interchange fitment is assigned during this process. Every detail shown in the fitment notes must match your vehicle exactly.

Q: What is an interchange fitment option for my 2021 GMC Sierra 1500 HD?

A: An interchange fitment option defines the exact donor vehicle configuration your part came from. For 2021 GMC Sierra 1500 HD, this may include engine size, VIN code, transmission model, drivetrain, axle ratio, and other critical identifiers. This data comes from VIN decoding, OEM information, and physical inspection of the donor vehicle.

Q: Why must every fitment detail match for my 2021 GMC Sierra 1500 HD?

A: Used OEM parts are not universal. If any fitment detail for your 2021 GMC Sierra 1500 HD differs from what is shown in the fitment notes, the Chassis Computer may not install, communicate with your vehicle, or function correctly. Always verify all fitment details before ordering.

Q: Where does the fitment information for my 2021 GMC Sierra 1500 HD come from?

A: Fitment information is captured when the donor vehicle is dismantled. The yard decodes the VIN for 2021 GMC Sierra 1500 HD, checks OEM data and interchange databases, and verifies details during physical inspection. The resulting fitment is then assigned to the Chassis Computer assembly.

Q: What if there are multiple fitment options for my 2021 GMC Sierra 1500 HD?

A: Many 2021 GMC Sierra 1500 HD vehicles were built with multiple configurations in the same year and trim. Trim name alone (XLT, Limited, Sport, etc.) is not enough. You must match the exact configuration shown in the fitment notes—such as engine size, transmission type, drivetrain, and axle ratio—before selecting a Chassis Computer.

Q: Where can I find my 2021 GMC Sierra 1500 HD VIN??

A: You can find the VIN for your 2021 GMC Sierra 1500 HD on the driver-side dashboard (visible through the windshield), inside the driver-side door jamb, and on your registration or insurance documents. The VIN helps confirm the correct configuration and fitment.

Q: Do trim levels affect fitment on my 2021 GMC Sierra 1500 HD?

A: Yes. Trim levels on your 2021 GMC Sierra 1500 HD can affect electronics, sensors, body parts, and interior components. Always match the detailed fitment notes for your configuration, not just the trim name, before selecting a Chassis Computer.

Attention!

There are 59 Chassis Computer choices for the 2021 GMC Sierra 1500 HD!!!
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