Help build this pageWant to be famous?Share a wire color, a photo or a tip for this truck, and your name goes on this page.
Add yoursClose▾
Which wires give constant, ignition and ground on a 2020 Chevrolet Express / GMC Savana?
On a 2020 Chevrolet Express / GMC Savana, take constant power from the Red/White wire at the BCM black 25-pin plug, pin 1, ignition from the Pink wire at the BCM green plug, pin 14, or the ignition switch black 6-pin, pin 2, 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 2020 Chevrolet Express and GMC Savana, cargo, passenger and cutaway. The Express and Savana share the same wiring.
The colors come from an installer sheet for a 2020 van (fetched three times), which matches the 2016 and 2018 sheets. Our own team has not yet metered these on a 2020 van, and each row says so.
OBD-II portUnder the driver dash
Best power spotBCM or ignition switch
System voltage12V
Ignition typeKey
Need More Installs?
We send fleet installation work to independent installers. One job goes to one installer. Now adding network partners in North Carolina.
Where do I get constant, ignition and ground on a 2020 Chevrolet Express / GMC Savana?
Take constant, ignition and ground from the same area. On 2016 to 2020 vans, the body control module (BCM) has constant, ignition, accessory and most signal wires.
Option 1 Easiest
At the BCM
Body control module. Our sheets give plug colors and pins but not where the BCM sits, so trace it from the plug colors.
Constant
Red/White
BCM black 25-pin plug, pin 1Always hot, 10A. There are several Red/White constants on this plug.
Ignition
Pink
BCM green plug, pin 14, or the ignition switch black 6-pin, pin 2Hot in run and start.
Ground
Body ground
Body metal under the dashClean, bare metal only. Never the battery negative post.
Accessory
Brown
BCM green plug, pin 21, or the ignition switch black 6-pin, pin 3Hot in accessory and run.
The main feed is Red/Black, 125A, at the body fuse box under the driver seat. Fuse anything you take from it.
Option 2 Ignition switch
Ignition switch, black 6-pin
Steering column. Key start.
Constant
Not on this plug
Use the BCM (Option 1)The ignition switch plug has no constant listed.
Ignition
Pink
Ignition switch black 6-pin plug, pin 2Hot in run and start.
Ground
Body ground
Body metal under the dashClean, bare metal only. Never the battery negative post.
Accessory
Brown
Ignition switch black 6-pin plug, pin 3Hot in accessory and run.
Pin 5 is a Pink R-code starter signal. Do not use it for power.
Power wires from installer wire sheets for 2016, 2018 and 2020 vans on the12volt, which agree plug for plug.
What are the turn signal, reverse and light wires on a 2020 Chevrolet Express / GMC Savana?
Circuit
Wire color
Location and what it does
Left turnPositive +Not yet checked
Light Blue/White (front)
Yellow (rear)
BCM brown plug, pin 4 front, pin 1 rearFlashes with the left signal.
Right turnPositive +Not yet checked
Dark Blue/White (front)
Dark Green (rear)
BCM black plug, pin 5 front; BCM brown plug, pin 2 rearFlashes with the right signal.
Park lightPositive +Not yet checked
Brown
Body fuse box, light gray 56-pin plug, pin B4On with the park lights.
HeadlightNegative -Not yet checked
White
BCM white plug, pin 12Headlight switch input. The 2018 sheet says it also has to trigger the park lights.
ReversePositive +Not yet checked
Dark Blue
BCM white plug, pin 22Hot in reverse.
Dome lightPositive +Not yet checked
Gray/Black
Dark Blue/White
BCM white plug, pin 5Dome supervision. The sheets list either color.
Each chip shows the main insulation color with its stripe. Each source is named on its row.
Where are the brake, door, speed and CAN wires on a 2020 Chevrolet Express / GMC Savana?
Circuit
Wire color
Location and what it does
BrakePositive +Not yet checked
Light Blue/White
BCM brown plug, pin 6Hot with the pedal pressed. The 2018 sheet says it works with the ignition on only.
DoorsNegative -Not yet checked
Gray/Black (driver)
Tan/White (passenger)
Dark Blue/White (left rear)
Yellow/Black (right rear)
BCM pink plug: pin 10 driver, pin 8 passenger, pin 15 left rear, pin 14 right rearDoor triggers. The driver door also has a Tan open wire on the BCM gray plug, pin 23.
Parking brakeNegative -Not yet checked
Light Blue
BCM brown plug, pin 16Grounds with the parking brake set.
HazardNegative -Not yet checked
White
BCM green plug, pin 19Hazard switch input.
Lock / unlockNegative -Not yet checked
Pink/Black (lock)
Orange/Black (unlock)
BCM gray plug, pin 12 (lock), pin 11 (unlock all)Yellow on pin 6 unlocks the driver door only.
Vehicle speedAC signalNot yet checked
Dark Green/White (gas)
Yellow/Black (diesel)
Engine computer on the driver fender: blue 56-pin, pin 50 (gas); 73-pin, pin 27 (diesel)Speed signal from the 2016 sheet.
TachAC signalNot yet checked
Dark Blue/White (gas)
Yellow/Violet (diesel)
Engine computer on the driver fender, pin 60 (gas); diesel: black 96-pin, pin 41Engine speed signal.
CAN busDataNot yet checked
Tan/Black (high)
Tan (low)
BCM blue plug, pins 8 and 9; OBD port pins 6 and 14The 2020 sheet lists Blue and White at the OBD port instead. Never cut or splice them.
Sources: installer wire sheets for 2016, 2018 and 2020 Express and Savana vans on the12volt, plus 2018 lock threads. The sheets disagree on CAN colors at the OBD port; meter them.
Which years share wiring with the 2020 Chevrolet Express / GMC Savana?
This page2020Installer sheet for a 2020 van.
Same wiring2016, 2017, 2018 and 2019The 2016, 2018 and 2020 sheets agree plug for plug.
Not this page2015 and older, 2021 and newerOlder vans use different plugs. We have not published 2021 and newer because we found no wire sheet for them yet.
Where are the fuse boxes and ground points on a 2020 Chevrolet Express / GMC Savana?
Under the driver seatBody fuse blockThe body fuse block sits under the driver seat, with the main power feed at its side.
Under the hoodUnderhood fuse blockWe did not find a fuse map we trust for this van. Check the lid.
Ground pointsClean body metalWe did not find a published ground point. Use clean, bare body metal, never the battery negative post.
Our team has not yet checked the fuse boxes on a van.
Where is the OBD-II port on a 2020 Chevrolet Express / GMC Savana?
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 2020 Chevrolet Express / GMC Savana wiring
What wire is constant power on a 2020 Chevrolet Express / GMC Savana?
Red/White at the BCM black 25-pin plug, pin 1. Always hot, 10A. Meter it before you tap it.
What wire is ignition on a 2020 Chevrolet Express / GMC Savana?
Pink at the BCM green plug, pin 14, or the ignition switch black 6-pin, pin 2. Hot in run and start. Meter it before you tap it.
Where is the reverse wire on a 2020 Chevrolet Express / GMC Savana?
Dark Blue (positive +) at the BCM white plug, pin 22. Hot in reverse. Meter it before you tap it.
Where is the brake wire on a 2020 Chevrolet Express / GMC Savana?
Light Blue/White (positive +) at the BCM brown plug, pin 6. Hot with the pedal pressed. Meter it before you tap it.
Where is the parking brake wire on a 2020 Chevrolet Express / GMC Savana?
Light Blue (negative -) at the BCM brown plug, pin 16. Grounds with the parking brake set. Meter it before you tap it.
Where is the vehicle speed signal on a 2020 Chevrolet Express / GMC Savana?
Dark Green/White (gas) and Yellow/Black (diesel) at the engine computer on the driver fender: blue 56-pin, pin 50 (gas); 73-pin, pin 27 (diesel). Speed signal from the 2016 sheet. Meter it before you tap it.
Which years share wiring with the 2020 Chevrolet Express / GMC Savana?
2016, 2017, 2018 and 2019. The 2016, 2018 and 2020 sheets agree plug for plug.
Help build this page
Had the panels off on one of these? Show the next installer what you found.
No one has sent photos for the 2020 Chevrolet Express / GMC Savana yet, so yours could be the first. Every photo, wire color and tip we use goes on this page with your name on it, and it saves the next installer time under the dash.
1. Snap it
The plugs, tap points, fuse boxes and ground points. Phone photos are fine.
2. Send it
Tap "Add yours" at the top of this page. Your tip and your photos go in the same box.
3. See your name on it
We check every tip, then post it here "Compliments of" you, by name.
Compliments of
The installers who helped build this page.
★
Founding contributor spot: openThe first installer to confirm a wire or send photos for the 2020 Chevrolet Express / GMC Savana gets their name here, and it stays here.
★
Every tip we use gets a creditThe wire you checked is marked "Checked on a truck, compliments of" you.
Want to be famous?
Your name, right on this page, for everyone who uses it to see. Add your tip and your photos in one box.
