4th Gen F Body Plug-and-Play LSX Harness for Holley EFI / Haltech

  • Sale
  • Regular price $949.95


If you're looking to take your 4th gen Camaro or Trans Am street car to the next level with Haltech or Holley EFI, we have your solution.

  • Intended for mild to moderate street cars that have hit limitations of a stock PCM.
  • Available for Haltech Elite, Holley HP, Dominator and Terminator X ECU's
  • Available for both LS and LT cars
  • Seamlessly plug-and-play with factory body connections
  • Retains full use of factory fuse and relay centers
  • Terminated alternator lead built-in
  • Plug-and-play to keep factory gauge cluster functional*
  • Factory traction control switch pinned to an input for custom function (as applicable for model year).
  • CAN bus connection fed inside cabin with gauge connections

Piggybacking Stock PCM

  • The stock gauge cluster on 99-02 cars will NOT function without piggybacking a factory PCM.
  • The stock gauge cluster on 93-98 cars can be made to function without piggybacking a factory PCM, but will require sacrificing some I/O from the Holley or Haltech ECU.
  • Harness is laid out to keep factory PCM in stock location, in RH rear corner of engine bay.
  • Factory PCM is left in control of mundane factory functions:
    • Radiator fans
    • Factory A/C control
    • Manual transmission functions
  • Holley / Haltech ECU is in full control of fuel, spark & automatic transmission controls (as applicable).
  • HPTuners / EFI Live license required to disable all applicable codes.
  • The option for piggybacking the stock PCM is NOT intended for keeping a car emissions compliant, and WILL NOT keep a car emissions compliant in states that require smog testing.

I/O Loadout

  • The harness features a "stub" connector at the RH rear corner of the engine bay, pinned with the following for easy access and wiring:
    • 4x aux inputs
    • 4x aux outputs
    • Sensor 5v reference
    • Sensor ground
    • Low current fused 12v
    • Chassis ground
  • Auxiliary I/O on the aftermarket ECU are used for functions such as auxiliary sensors and race functions:
    • Boost control
    • Nitrous control
    • Flex fuel
    • Trans brake / 2 step
    • Auxiliary pressure & temperature sensors
  • Select desired functions and we will build a package that best suits your needs and works with your ECU.
  • Additional charges may apply for certain functions and features.
  • If no options for I/O are selected, the I/O stub mating connector will be supplied with loose terminals for you to wire up I/O on your own.
  • Auxiliary I/O can be used for fan control, A/C control, etc rather than opting to piggyback a stock PCM, but options for additional functions may then be limited.