Which wires give constant, ignition and ground on a 2023 Chevrolet Silverado 2500HD / 3500HD?
On a 2023 Chevrolet Silverado 2500HD / 3500HD, take constant power from the Red/White wire at the body control module, ignition from the Purple/Black wire at the body control module, and ground to the Black wire at the body control module. Meter every wire first.
Meter every wire before you tap it. Colors change with trim and build date.
OBD-II port:Location not confirmedBest power spot:Body control module, driver side under the dashSystem voltage:12VIgnition type:Key or push-button
Power: pick your truck
Both key and push-button trucks take power at the body control module under the dash on the driver side. Purple/Black is ignition on both.
Option 1 Key start
Key trucks
Body control module left of the steering column. Fortin draws 25-pin, blue and pink 27-pin, and white and gray 26-pin plugs.
Constant
Red/White
Body control moduleAlways hot, 12V.
Ignition
Purple/Black
Body control moduleHot in run.
Accessory
Purple/Yellow
Body control moduleHot in accessory and run.
Ground
Black
Body control moduleGround wire.
The key guide does not say which plug each wire is in. Find the color and meter it.
Option 2 Push-button
Push-button trucks
Body control module above the driver kick panel: blue 27-pin, green 25-pin and white 26-pin plugs.
Constant
Red/Yellow
Red/White
Body control moduleAlways hot, 12V. Fortin prints Red/Yellow or Red/White.
Ignition
Purple/Black
Body control module, green 25-pin plugHot with the truck on.
Ground
Body ground
Body metal under the dashNo ground wire printed for push-button trucks. Never the battery negative post.
Ignition sits under Fortin's green 25-pin drawing.
From Fortin's install guides for the 2019 Silverado and Sierra 1500 with a key and the 2020 to 2022 Silverado with push-to-start, which Fortin lists for the 2020 to 2023 HD trucks. Fortin uses its 1500 guides for these HD years.
Where are the turn signal, reverse and light wires on a 2023 Chevrolet Silverado 2500HD / 3500HD for advanced 360 multicam and video telematics installs?
Circuit
Wire color
Location and what it does
Left turnNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Right turnNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Park lightNegative -Not yet checked
Green/Gray
Body control module (white 26-pin on push-button trucks)Negative parking light signal.
HeadlightNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
ReverseNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Dome lightNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Each chip shows the main insulation color with its stripe. Source: Fortin's install guides for the 2019 Silverado and Sierra 1500 with a key and the 2020 to 2022 Silverado with push-to-start, which Fortin lists for the 2020 to 2023 HD trucks.
Where are the brake, door, speed and CAN wires on a 2023 Chevrolet Silverado 2500HD / 3500HD for advanced 360 multicam and video telematics installs?
Circuit
Wire color
Location and what it does
BrakePositive +Not yet checked
Blue/Yellow
Push-button trucks: body control module, blue 27-pin plugPositive foot brake signal, per Fortin. Sense only.
Tailgate releaseNegative -Not yet checked
Gray
Key trucks: body control moduleNegative trigger.
Door lockNegative -Not yet checked
Yellow/Purple (lock)
Brown/Purple (unlock)
Key trucks: body control moduleNegative lock and unlock triggers on trucks without OnStar, per Fortin.
Push-button startNegative -Not yet checked
Blue/Green
Push-button trucks: body control module, blue 27-pin plugStart/stop signal. Never tap it.
DoorsNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Parking brakeNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Vehicle speedNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
CAN dataDataNot yet checked
Green
Body control moduleSingle-wire GM CAN (GMLAN). Never cut or splice it.
Source: Fortin's install guides for the 2019 Silverado and Sierra 1500 with a key and the 2020 to 2022 Silverado with push-to-start, which Fortin lists for the 2020 to 2023 HD trucks. Turn, reverse, headlight, dome, door, parking brake and speed wires were not found.
Where are the fuse boxes and ground points on a 2023 Chevrolet Silverado 2500HD / 3500HD?
InteriorFuse panelNo fuse position for these years was found in a source. Read the lid label and meter the slot.
Body moduleDriver side under the dashPer Fortin's photos.
Ground pointsBlack wire on key trucksOr clean body metal. Never the battery negative post.
Locations from Fortin's install guides.
Where is the OBD-II port on a 2023 Chevrolet Silverado 2500HD / 3500HD?
OBD II
Diagnostic portOBD-II port: location not confirmedLook under the driver side dash first, and send us a photo if you find it.
Which years share wiring with the 2023 Chevrolet Silverado 2500HD / 3500HD?
This page2023Silverado and Sierra HD, key or push-button.
Same wiring2020, 2021, 2022Fortin lists the same guides for 2020 to 2023.
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This page covers the 2023 Chevrolet Silverado 2500HD and 3500HD and the GMC Sierra HD with a gas engine, key or push-button start.
The wire colors come from Fortin's install guides, read wire by wire. Fortin uses its Silverado 1500 guides for these HD years. Our own team has not yet metered these on a 2023 truck.
Written by API Signal, fleet GPS and camera installers for 35+ years across Georgia, South Carolina and North Carolina, installing every major telematics and camera brand. Every wire on this page lists its source.
Test every wire with a meter before you tap it
No wiring information is ever guaranteed. Colors and locations change with trim, options and build date, and the manufacturer can change them in the middle of a model year. We share this as a starting point for installers, and you are responsible for confirming every connection on the truck in front of you.
Common questions about 2023 Chevrolet Silverado 2500HD / 3500HD wiring
What wire is constant power on a 2023 Chevrolet Silverado 2500HD / 3500HD?
Red/White at the body control module. Always hot, 12V. Meter it before you tap it.
What wire is ignition on a 2023 Chevrolet Silverado 2500HD / 3500HD?
Purple/Black at the body control module. Hot in run. Meter it before you tap it.
Where is the brake wire on a 2023 Chevrolet Silverado 2500HD / 3500HD?
Blue/Yellow (positive +) at the push-button trucks: body control module, blue 27-pin plug. Positive foot brake signal, per Fortin. Meter it before you tap it.
Which years share wiring with the 2023 Chevrolet Silverado 2500HD / 3500HD?
2020, 2021, 2022. Fortin lists the same guides for 2020 to 2023.
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1. Snap it
The plugs, tap points, fuse boxes and ground points. Phone photos are fine.
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