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2007-2012 GM Gen IV 4.8-6.2L Harness - Throttle by Wire By Painless Performance

P/N 60526

2007-2012 GM Gen IV 4.8-6.2L Harness - Throttle by Wire


  • Application
  • Specs
  • Larger Image
  • ECM Re-Flash
Year: 2007 - 2012
Make: General Motors
Model: Truck/SUV
Engine: 4.8, 5.3, 6.0, 6.2L
Trans.: 4L65E
Free ECM Flash American Made


This harness is designed for use on any 2007-2012 4.8L, 5.3L, 6.0L, & 6.2L Vortec truck engines with throttle by wire. It uses the factory ECM & TCM and will operate engines with or without variable valve timing (VVT) and active fuel management (displacement on demand or DOD). Our free tuning program is only compatible with a 4L65E transmission. You can however, use any GM 4 speed electronic or manual transmission with this harness, with the proper tuning from your tuner. This harness does not support flex fuel operation. Included with this harness is a 10 circuit weatherproof fuse block & mounting bracket, GM color coded wires with labels, and all the required terminals and connectors for easy installation.


This standard length harness allows four feet from the back of the intake manifold to where the fuseblock and ECM mount. Perfect for those that plan to mount these components under the dash or in the glove box.


This harness also requires the following mating parts; ECM #12597121 (Painless # 60701) or #12612384 (Painless # 60702); TCM #24234503(Painless # 60710); Accelerator Pedal #25832864 or #25835421. 

Purchase this harness today and qualify for Painless Performance®™ to flash your ECM at a reduced rate.  Click here for details.

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


Number of Circuits: 10 Fuses with 2 Ignition, 1 Cooling Fan & 1 Fuel Pump Relay
Harness Length: 4 Feet Between Engine and ECM
Fuse Type: Mini Blade
Firewall Passthrough: Grommet
Color Code Based: 2007 - 2012 Vortec Truck/SUV
Circuit Designations: Printed Wire Tags on all Connectors and Open Ended Wires

The Fuse Block Protects The Following Circuits:

  • ECM and Data Link Connector B+
  • ECM and Malfunction Indicator Lamp
  • Fuel Pump
  • Heated O2 Sensors
  • Ignition Coils
  • Injectors
  • Mass Airflow and Valve Lifter Oil Manifold (DOD)
  • TCM
  • TCM B+
  • Transmission
  • 40 Amp Cooling fan Relay and Circuit Breaker (ECM Activated)
  • 20 Amp Fuel Pump Relay
  • 40 Amp & 20 Amp Ignition Relays



This harness includes connections for the following components:

  • Accelerator Pedal Position Sensor
  • Alternator (Including a 4 gauge power wire)
  • Brake Switch
  • Cam Position/Cam Phazer Sensor
  • Cooling Fan
  • Crank Position Sensor
  • Data Link Connector 
  • Driver/Pass Front O2 Sensors
  • Driver/Pass Knock Sensors
  • ECM
  • Engine Coolant Temperature
  • Fuel Pump
  • Grounds 
  • Ignition Coils
  • Ignition Switch Signal
  • Injectors
  • Input Speed Sensor 4L80E/4L85E 
  • Malfunction Indicator Lamp
  • MAP Sensor
  • Mass Airflow / Intake Air Temperature Sensor
  • Oil Pressure Sensor
  • PRNDL Switch
  • Reverse Lights
  • Starter
  • TCM
  • Throttle Body 
  • Transmission
  • Valve Lifter Oil Manifold (DOD)
  • Vehicle Speed Sensor
  • VSS Output for Speedometer


 2007-2012 GM Gen IV 4.8-6.2L Harness - Throttle by Wire 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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