Replacing ECU

Requirements

  • Tech2
  • VIN of the original ECU
  • VIN of the replacement ECU
  • Contact details Holden to retrieve the four digit security code
  • Four digit security code of the original ECU
  • Four digit security code of the replacement ECU

Getting Codes

  • Install replacement ECU and using the Tech2 go to module information. Find and write down replacement ECU VIN.
  • Write down original ECU VIN.
  • Call Holden and give them the two VIN's and get the four digit security code for each VIN.
  • Once you have both security codes you are good to continue.

Unlocking ECU

  • With the original ECU installed in the car, select ECU on the Tech2 and enter Special Functions > Reset ECU. Perform the ECU reset, following the instructions on the screen and using the security code of the original ECU that you got from Holden.
  • Remove the original ECU from the vehicle and install the replacement ECU.
  • With replacement ECU installed in the car, select ECU on the Tech2 and enter Special Functions > Reset ECU. Perform the ECU reset, following the instructions on the screen and using the security code of the replacement ECU that you got from Holden.

Linking replacement ECU

  • Go to BCM > Special Functions > BCM to PIM link. Follow the steps on the Tech2 to link the PIM and BCM and using the 4 digit security code for the original ECU/VIN.
  • Go to ECU > Special Functions and perform a PIM to ECU link. Follow the steps on the Tech2 and using the 4 digit security code for the original ECU/VIN.

Finishing up

  • Clear fault codes for;
    • BCM
    • PIM
    • ECU