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Tuesday 02/20/2018
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GM 2007-UP Gen.IV Engine & Trans. Harness w/Custom Flashed ECM & TCM By Painless Performance

P/N 60026

GM 2007-UP Gen.IV Engine & Trans. Harness w/Custom Flashed ECM & TCM


  • Application
  • Specs
  • Larger Image
  • ECM Re-Flash
Year: 2007 - UP
Make: General Motors
Model: Truck/SUV
Engine: 4.8, 5.3, 6.0, 6.2L
Trans.: 4L65E, 4L70E, 4L80E, 4L85E
Free ECM Flash American Made


Features include:

  • Utilizes Factory Style ECM and TCM

  • Integrated Weatherproof Fuseblock

  • 10 Fused Power Circuits include ECM/DLC, Injectors, Coils, O2 Sensors, ECM Ignition, MAF/VLOM and Fuel Pump

  • Integrated 30 Amp Fuel Pump, 40 Amp Cooling Fan and two Ignition Relays

  • 4 feet of harness length between ECM connections and main engine breakout

  • Harness includes a 4 gauge alternator charge wire.

This harness will operate any 4.8L, 5.3L, 6.0L & 6.2L GEN IV truck/suv engine coupled to a 4L65E, 4L70E, 4L80E or 4L85E transmission.  You cannot use a 4L60E transmission with this harness as it is missing the Input Speed Sensor required by the Transmission Control Module.

This harness supports engines with or with out Displacement on Demand and/or Variable Valve Timing.

This harness does not support Flex Fuel operation.

Note:  It is required to do the following once you have purchased this 60026 part number.  Fill out the online computer flash form.  This form provides us the information we need to flash the PCM and TCM to your specifications.  Click here to be taken to the ECM page. 

Any questions regarding this Painless Performance part number, the computer flash form or computer programming should be directed to Dennis Diehl @ 1-800-423-9696.

We recommend checking the online manual for the full list of required mating parts prior to ordering.  


Number of Circuits: 10 Fuse/ 4 Relay
Harness Length: Standard
Fuse Type: Blade
Firewall Passthrough: Rubber Grommet
Color Code Based: OEM
Circuit Designations: Each connection is labeled on harness.
Connectors Included: ECM, TCM, TPS, TAC Motor, APPS, CTS, IAT, MAF, MAP, Injectors, Coils, CMP, CKP, Knock, VLOM, VVT, VSS, 4L65-85E Transmission, Front Bank 1 & 2 O2 Sensors, OBD2 w/SES Light

This kit includes:

  1. All new fuel injection harness with OEM fitment connectors and harness breakouts
  2. Tested, Painted and Custom Flashed PCM & TCM
  3. OBDII connector, mounting bracket and check engine light
  4. Crimp-on terminals, rubber grommet
  5. Mounting hardware
  6. Installation manual

 GM 2007-UP Gen.IV Engine & Trans. Harness w/Custom Flashed ECM & TCM By Painless Performance



ECM Flash Program



This is a basic start and run tune that we only recommend for a near stock application. We will only change the following parameters: delete VATS/PASS-KEY security, cooling fan on/off temperatures, rear end gear ratio, tire size, speed limiter, rpm limiter, idle rpm, and we will adjust the check engine light parameters. If your setup requires any other parameters tuned you will need to locate a local tuner. All ECMs are left unlocked to allow easy access for your tuner.

Step 1: Purchase one of the qualifying part numbers. See below for that list.

Step 2: If your part number is highlighted RED proceed to step 3B. If your part number is highlighted BLACK, proceed to step 3A.

Step 3A: If you have arrived at this step, your harness does not come with an ECM and you must provide one to be flashed. Please reference the manual with your harness to confirm the ECM part number required.

Step 4A: Once you have received your harness, please cut the Barcode label from the box as shown in the picture below.

Step 5A: Package and mail your ECM along with the Barcode label, a copy of your purchase receipt, and your ECM form that you are about to complete. (The address will be provided after you complete the form). We will pay for return ground shipping*. If you request a faster service, you will need to provide a return label.

Step 3B: If you have arrived at this step, your purchase comes with an ECM. You must fill out our ECM form BEFORE your purchase will ship. Proceed to Step 6.

Step 6: Click the “Start Here” button below to fill out our ECM questionnaire.

Step 7: Once we have the ECM, we will use the data from the form to flash the ECM. Then, once it has been flashed we will package the ECM and ship it back to you. If we encounter a question, we will contact you. This process can take 1-3 days.

Step 8: Once you receive your ECM, it is ready to go.


*Note: Our free return shipping is ONLY good for the lower 48 states, via ground UPS. If you are outside of those states, you must provide a return shipping label with your order. If your purchase comes with an ECM, the shipping will be covered via the retailer you purchased from.



Click the Start Here button below to get your FREE ECM Flash!

Click Here To Start The ECM Reflash Process


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