03–07 Vortec DBW Standalone Harness for 4L60E & 4L80E

APPLICATION: 2003 - 2007 CHEVROLET, GMC, CADILLAC AND HUMMER TRUCK ENGINES (DRIVE BY WIRE ONLY) WITH 4L60E OR 4L80E TRANSMISSIONS.

PARTS INCLUDED: Complete engine and transmission Harness, Instruction Manual

CONNECTIONS FOR:

Fuse/Relay Box
Fuel Pump Control (Relay included)
Fan controls (Relays and fuse available seperately KIT-1010)
Check Engine Light, Speedo output, Tachometer, OBD2 Port
Accelerator Pedal and Throttle Body control (DBW setups)
MAF Sensor
MAP Sensor
Engine Coolant Temp Sensor
Alternator Control
(2) Upstream Oxygen Sensors
Crankshaft Position
Camshaft Position
Fuel Injectors
Coils
Automatic or Manual Transmission control
Knock Sensors

NOTES: These Harnesses are designed for retrofitting '03 - '07 Vortec engines (4.8, 5.3, 6.0-Liter) and 4L60E or 4L80E transmissions into older muscle cars and street rods. Harness allows use of Multec Injectors with flex-fuel Injectors (EV6) optional. They are completely plug and play with four wire hookup (switched power, constant power and ground connections required). Harnesses are designed with a sliding grommet seal and 4 - 5 feet of length from the rear of the cylinder head to the PCM mounting position under the vehicle dashboard. A sliding grommet seal allows for professional, leak proof installation.

Harnesses are professionally constructed from Brand New GM Delphi Connectors and TXL (Polyethylene Cross Linked) High Temperature Wire to GM Specifications. All Harnesses are 100% Quality Inspected prior to shipping. All Harnesses require PCM VATs removal, available through PSI.

ADDITIONAL ITEMS REQUIRED:PCM-1005

Reviews
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Write a Review
- 03/16/2026
  
  Only harness supplier I will use
  
  I've tried several harness builders but only use PSI since the first one I purchased. Quality harness and fair price.
  
  Car show giveaway pullout
- 03/17/2023
  
  Quality product
  
  PSI was recommended by a friend who has experience with other harness makers. At first I thought your price was a little high but being an industrial electrician for 35 years I know you usually get what you pay for. I installed the harness in just a few hours by myself and it looks great. I will also recommend PSI to anyone in the future. Thanks for making my first swap so easy!
  
  JMac
- 02/28/2023
  
  69 camaro ls 5.3 swap
  
  First class work harness fits like it should look great plug an play
  
  Hillbilly
- 01/04/2023
  
  Wire harness
  
  Harness worked great, only thing is it could be a little bit longer. I never mount the PCM and fuse box inside because there's just no room to mount them inside especially trucks. So I always try to mount them close to where the factory mounts them. Other than that it works well. Sometimes the wire to the maf are too short because your really dont know which side the cold air intake will be .
  
  Money
- 12/02/2022
  
  awesome
  
  well did my 1st LS swap into a scout 2, bought a bargain deal harness and pcm from a fella that did them as a side Hussle (wrong had nothing but problems) so i decided to buy a complete harness and pcm from psi, routed my wires hooked everything up and BAM engine fired up and runs great! i highly recommend buying a harness and pcm set up for your project..it will save you hours of frustration...73 IHC scout 2 with a 6.0/4l80/np241...like all LS swaps you will still need to have it fine tuned
  
  guy with all the scouts
- 09/10/2022
  
  Delivered what was advertised
  
  It was very well packaged. Great work sheet of product. Easy to install. Engine fired right up with no issues.
  
  Mike W
- 01/07/2022
  
  Fantastic product
  
  Ordered my harness a few months back after trying to modify a stock harness myself. Harness came in and was oem quality with excellent length for a connections needed to my engine. Directions very clear. Will be buying another harness for my next ls swap
  
  Doug
- 12/29/2021
  
  Clean as promised
  
  Clean harness done in a timely manner.
  
  Revisions
- 11/04/2021
  
  Great product!
  
  This harness simplified my install and looks great. No complaints.
  
  Chris
- 10/01/2021
  
  Awesome!
  
  This is a great product. Reasonable price, easy to install, great instructions, and looks better than factory.
  
  Chris
- 03/28/2021
  
  Choosing the best products for our customers
  
  excellent products and Amazing customer support
  
  Maloneys Restoration
Applications

Looking for an Affordable, In Stock, Plug and Play wiring harness for your LS Swap? PSI sells Standalone Wiring Harnesses for GM Gen II, III, IV, & V LS/LT based engines and transmissions. These harnesses include the Gen II LT1/LT4, Gen III (24x) LS1/LS6 and Vortec Truck Engines as well as Gen IV (58x) LS2, LS3, LS7, & Vortec and GEN V LT / ECOTEC3 Engines. All PSI Harnesses are Made in the USA and are 100% Computer Quality Tested. In addition to wiring harnesses, PSI carries Holley Products, Vintage Air A/C, Dakota Digital Gauges, HPTuners and PCM programming, Fuel Pump Kits, Engine Sensors, Extension Harnesses, Replacement GM connector pigtails and a complete line of hardware to complete your conversion!

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03 - '07 Vortec (DBW) w/ 4L60E or 4L80E w/ 5 pin MAF Standalone Harness

03 - '07 Vortec (DBW) w/ 4L60E or 4L80E w/ 5 pin MAF Standalone Harness

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