2019 Chevrolet Silverado 2500HD / 3500HD and GMC Sierra HD
Pickups and 3500HD chassis cab. Gas and Duramax diesel. Key start.
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Which wires give constant, ignition and ground on a 2019 Chevrolet Silverado 2500HD / 3500HD and GMC Sierra HD?
On a 2019 Chevrolet Silverado 2500HD / 3500HD and GMC Sierra HD, take constant power from the Red/Yellow wire at the upfitter plug X61A, pin 7 and ignition from the Violet/White wire at the upfitter plug X61A, pin 11, and ground to clean, bare body metal. Meter every wire first.
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.
This page covers the 2019 Chevrolet Silverado 2500HD and 3500HD and the GMC Sierra 2500HD and 3500HD, including the 3500HD chassis cab, the last year of this body (the 1500 changed in 2019, the HD in 2020). The easiest power spot is GM's upfitter plug in the driver footwell, which has constant, ignition, ground and speed on one plug.
Colors come from the iDatalink guide for 2017 to 2019 HD trucks and GM's upfitter bulletins, which cover the 2019 old-body HD. We only list wires an HD source confirms, so some rows say not found. Our own team has not yet metered these on a 2019 truck, and each row says so.
OBD-II portUnder the driver dash
Best power spotUpfitter plug, driver footwell
System voltage12V
Ignition typeKey
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Where do I get constant, ignition and ground on a 2019 Chevrolet Silverado 2500HD / 3500HD and GMC Sierra HD?
Take constant, ignition and ground from the same area. GM's upfitter plug X61A in the driver footwell has constant, ignition, accessory, ground and vehicle speed on one plug, with colors from GM itself.
Option 1 Easiest
GM upfitter plug X61A
At the integrated center stack module (ICEM), in the driver footwell near the parking brake. GM lists it for 2014 and newer trucks, including the 2015 HD. Check your truck has it.
Upfitter plug X61A, pin 10GM's ground pin on the upfitter plug.
Accessory
Violet/Yellow
Upfitter plug X61A, pin 8Accessory, 10A.
Pin 19 is vehicle speed (Green/Gray) and pin 9 is GM's single-wire CAN (Green). GM also lists a battery feed on pin 17 in one copy of the bulletin; we could not confirm it, so meter it.
Option 2 BCM
At the BCM
Body control module, left side of the steering column under the dash.
Constant
Not found
Not found for the HDWe found no HD source for a BCM constant wire. Use the upfitter plug (Option 1) or a fuse tap.
Ignition
Violet/Black
BCM green 25-pin plug (X3), pin 6Hot in run and start. The iDatalink guide for 2017 to 2019 HD trucks.
Ground
Body ground
Body metal under the driver dashClean, bare metal only. Never the battery negative post.
Accessory
Violet/Yellow
BCM green 25-pin plug (X3), pin 5Hot in accessory and run.
The BCM also has the lock (Brown/Yellow) and unlock (Brown/White) wires on the blue 27-pin plug. See below.
Upfitter plug colors from GM's upfitter bulletin #115f (fetched three times). BCM colors from the iDatalink guide for 2017 to 2019 HD trucks (fetched twice).
What are the turn signal, reverse and light wires on a 2019 Chevrolet Silverado 2500HD / 3500HD and GMC Sierra HD?
Circuit
Wire color
Location and what it does
Left turnPositive +Not yet checked
Yellow/Light Green (rear)
Left tail lamp connector X410, pin 1Rear stop and turn share one wire on this truck, so it also lights with the brake. GM's upfitter bulletin #129c.
Right turnPositive +Not yet checked
Brown/Light Green (rear)
Right tail lamp connector X420, pin 5Rear stop and turn share one wire on this truck, so it also lights with the brake. GM's upfitter bulletin #129c.
Park lightPolarity: meter itNot yet checked
Light Green/Gray (switch input)
Violet/Gray (left rear)
Gray/Brown (right rear)
BCM white 26-pin plug (X1), pin 22; rear lamps at X410 pin 5 (left) and X420 pin 1 (right)Park light switch input, from the iDatalink HD guides. The rear park lamp colors are from GM's rear connector bulletin. The switch input is negative; meter the rear lamp wires.
HeadlightNot foundNot yet checked
Not found
Not found for the HDWe found no HD source for the headlight wire.
ReversePositive +Not yet checked
Light Green/White
Tail lamp connectors X410 and X420, pin 4Backup lamp, both sides. GM's upfitter bulletin #129c.
Dome lightNot foundNot yet checked
Not found
Not found for the HDWe found no HD source for the dome wire.
Each chip shows the main insulation color with its stripe. Source: GM upfitter bulletin #129c (rear lamps) and the iDatalink HD guide (park light input).
Where are the brake, door, speed and CAN wires on a 2019 Chevrolet Silverado 2500HD / 3500HD and GMC Sierra HD?
Circuit
Wire color
Location and what it does
BrakePolarity: meter itNot yet checked
Violet/Gray
Engine-to-chassis connector X400, pin 4Stop lamp control, from GM's upfitter bulletin #129c. GM does not say where X400 sits; meter it with the pedal pressed.
LockNegative -Not yet checked
Brown/Yellow
BCM blue 27-pin plug (X2), pin 19Lock input, from the iDatalink HD guides. A 2014 installer thread agrees.
UnlockNegative -Not yet checked
Brown/White
BCM blue 27-pin plug (X2), pin 15Unlock input.
DoorsNot foundNot yet checked
Not found
Not found for the HDWe found no HD source for this wire.
Parking brakeNot foundNot yet checked
Not found
Not found for the HDWe found no HD source for this wire.
Vehicle speedAC signalNot yet checked
Green/Gray
Upfitter plug X61A, pin 194,000 pulses per mile. GM says it needs a 5k ohm pull-up resistor to 12V. GM's upfitter bulletin #115f.
TachNot foundNot yet checked
Not found
Not found for the HDWe found no 2015 to 2019 tach wire for the gas or Duramax engines. The 2013 diesel wire does not carry over.
Chassis cab PTO plugPositive +Not yet checked
Red/Violet (battery, K)
Violet/White (ignition, R)
Black (ground, D)
3500HD chassis cab only: black 16-way plug X191, rear of the cab near the right frame railPin G is PTO status (Yellow). GM's upfitter bulletin #120g, for Duramax and Allison chassis cabs.
CAN busDataNot yet checked
Blue (HS high)
White (HS low)
Green (GMLAN)
OBD port pins 6 and 14; single-wire GMLAN at upfitter plug X61A, pin 9Never cut or splice them.
Sources: iDatalink install guides for 2015 to 2016 and 2017 to 2019 Silverado and Sierra 2500/3500 (aftermarket guides), GM Upfitter Integration Bulletins #115f (upfitter plug X61A), #129c (rear lamp connectors, 2016 to 2019) and #120g (3500HD chassis cab PTO plug). Headlight, dome, doors, parking brake, hazard, tach and park/neutral were not found for the HD.
Which years share wiring with the 2019 Chevrolet Silverado 2500HD / 3500HD and GMC Sierra HD?
This page2019, last year of this bodyiDatalink 2017 to 2019 HD guide and GM upfitter bulletins.
Same wiring2015, 2016, 2017 and 2018All five years use the same K2XX HD cab. The iDatalink guides split 2015 to 2016 and 2017 to 2019 but list the same colors, and GM's upfitter plug bulletin covers the whole run.
Not this page2014 and older, 2020 and newerThe 2007 to 2013 HD trucks are the GMT900 and have their own pages. We have not published 2014 because we found no 2014 HD wire sheet. 2020 brought a new generation.
Where are the fuse boxes and ground points on a 2019 Chevrolet Silverado 2500HD / 3500HD and GMC Sierra HD?
Upfitter plugFused by GMX61A pin 7 battery 15A, pin 8 accessory 10A, pin 11 run/crank 15A, from GM's upfitter bulletin.
Fuse panelsNot confirmed for the HDWe did not find an HD fuse chart we trust. Check the lid of the fuse box.
Ground pointsX61A pin 10 or body metalUse the upfitter plug ground or clean, bare body metal, never the battery negative post.
Upfitter plug fuses from GM's upfitter bulletin. Our team has not yet checked them on a truck.
Where is the OBD-II port on a 2019 Chevrolet Silverado 2500HD / 3500HD and GMC Sierra HD?
OBD II
Diagnostic portOBD-II port: under the driver dashPlug-in GPS trackers and OBD harnesses connect here. Check the port before you plan the install.
Common questions about 2019 Chevrolet Silverado 2500HD / 3500HD and GMC Sierra HD wiring
What wire is constant power on a 2019 Chevrolet Silverado 2500HD / 3500HD and GMC Sierra HD?
Red/Yellow at the upfitter plug X61A, pin 7. Battery feed, 15A. Meter it before you tap it.
What wire is ignition on a 2019 Chevrolet Silverado 2500HD / 3500HD and GMC Sierra HD?
Violet/White at the upfitter plug X61A, pin 11. Run/crank, 15A. Meter it before you tap it.
Where is the reverse wire on a 2019 Chevrolet Silverado 2500HD / 3500HD and GMC Sierra HD?
Light Green/White (positive +) at the tail lamp connectors X410 and X420, pin 4. Backup lamp, both sides. Meter it before you tap it.
Where is the brake wire on a 2019 Chevrolet Silverado 2500HD / 3500HD and GMC Sierra HD?
Violet/Gray at the engine-to-chassis connector X400, pin 4. Stop lamp control, from GM's upfitter bulletin #129c. Meter it before you tap it.
Where is the vehicle speed signal on a 2019 Chevrolet Silverado 2500HD / 3500HD and GMC Sierra HD?
Green/Gray at the upfitter plug X61A, pin 19. 4,000 pulses per mile. Meter it before you tap it.
Where is the CAN bus on a 2019 Chevrolet Silverado 2500HD / 3500HD and GMC Sierra HD?
Blue (HS high) and White (HS low) and Green (GMLAN) at the OBD port pins 6 and 14; single-wire GMLAN at upfitter plug X61A, pin 9. Never cut or splice them.
Which years share wiring with the 2019 Chevrolet Silverado 2500HD / 3500HD and GMC Sierra HD?
2015, 2016, 2017 and 2018. All five years use the same K2XX HD cab.
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