PCM of NC is now hiring for a full time office/shipping position. 6L80e to 4LXXe Conversion Harness $ 738.99. Vehicles built on or after – clean and apply electrical grease to the Powertrain High Voltage Interlock (PT HVIL) terminal shunt and reprogram the PCM. Vehicles built before – inspect the HV wire harness, update the HV wire harness, and reprogram the PCM.