Year Make Model | Painless Performance
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2005-2006 GM LS2 EFI Harness - Throttle By Wire By Painless Performance
Made In USA
P/N 60520 $634.99
2005-2006 GM LS2 EFI Harness - Throttle By Wire



Check Quality Tested - Lifetime Warranty
Check All New Connectors/Terminals
Check High Quality TXL Wire
Check OBD-II Port included
Check Check Engine Light included

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  • App
  • Specs

This harness is standalone and is not intended to replace the OEM engine wiring.  Standalone harnesses are intended to run the designated engine & transmission only, generally when swapped into another vehicle.  


This harness is designed for the 2005 - 2006 throttle by wire LS2 engines using an LS1 / LS6 ECM and a 4L60E/4L65E automatic or T56 manual transmission (will not fit Corvette transaxle transmissions). The engine must have a 24x crank reluctor (black). This harness will not work with a factory GTO ECM. This harness will only operate these LS2 engine codes:  ZJA, ZJB, 5MC, YTA and 6MC.  These engines were factory equipped in 2005 Corvette, 2005-2006 GTO and 2006 SSR and also available as a crate engine from GMP. Harnesses do not include any emissions related connections. Included with this harness is an 8 circuit modular fuse block and GM color coded wires with labels 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 kit includes:

  1. All new fuel injection harness with OEM fitment connectors and harness breakouts
  2. OBDII connector, mounting bracket and check engine light
  3. Rubber grommet
  4. Mounting hardware

This harness also requires the following mating parts; ECM #12200411 (Painless # 60700); TAC Module #12578953; Accelerator Pedal #12565643. 


We suggest trying a certified used parts supply such as

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





WarningProp 65 Warning
Hazardous Material Warning

WARNING: This product can expose you to chemicals including lead which is known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit

Link to P/N:
Engine: 6.0L LS2 w/ 24X Crank Reluctor & 2X Cam Reluctor
Trans.: 4L60E, T-56

Number of Circuits: 8 Fuses with 2 Ignition & 1 Fuel Pump Relay
Harness Length: 4 Feet Between Engine and ECM
Fuse Type: Blade
Firewall Passthrough: Grommet
Color Code Based:  2002 Corvette
Circuit Designations: Printed Wire Tags on all Connectors and Open Ended Wires

The Fuse Block Protects The Following Circuits:

  • DLC B+
  • Driver Side Injectors and Coils
  • Dual 40 amp Ignition Relays
  • ECM and Malfunction Indicator Lamp
  • ECM B+
  • Fuel Pump
  • Heated O2 Sensors, Mass Airflow Sensor, & Brake Switch
  • Pass Side Injectors and Coils
  • Transmission and TAC Module


This harness includes connections for the following components:

  • Accelerator Pedal Position Sensor
  • Alternator 
  • Brake Switch
  • Cam Position Sensor
  • Clutch Pedal Position 
  • Crank Position Sensor
  • Cruise Control
  • Data Link Connector 
  • Driver/Pass Front O2 Sensors
  • Driver/Pass Knock Sensors
  • ECM
  • Engine Coolant Temperature
  • Fan #1 Relay Ground ECM Activation
  • Fan #2 Relay Ground ECM Activation
  • Fuel Pump
  • Fuel Pump Relay
  • Fuel Pump Test 
  • Gear Indicator Switch
  • Grounds 
  • Ignition Coils
  • Ignition Switch Signal
  • Injectors
  • Malfunction Indicator Lamp
  • MAP Sensor
  • Mass Airflow / Intake Air Temperature Sensor
  • Oil Pressure Sensor
  • Reverse Lockout Solenoid 
  • Skip Shift Light 
  • Skip Shift Solenoid 
  • Starter
  • Throttle Actuator Control Module 
  • Throttle Actuator Control Module to Accelerator Pedal Pigtail
  • Tachometer
  • Throttle Body 
  • Transmission
  • Vehicle Speed Sensor
  • VSS Output for Speedometer