My ECU still has trouble codes, idle issues, and is not communicating or starting:
- Trouble Codes, also known as soft codes, can be stored in the vehicle's PCI Bus if the removal of the battery and ECU were done incorrectly.
- If the vehicle’s battery was not disconnected prior to removing the unit, it may inadvertently blow a fuse along the wiring behind the dash, a relay near the fuse box, or a fuse in one of the multiple fuse boxes in the vehicle. This will cause the PCI Bus to store the soft codes.
- Check for blown fuse
- Replace fuse if blown
- The fastest and easiest ways to clear soft codes in the vehicle is to do a simple battery reset:
- Disconnect the battery cables
- Clamp the battery cables together with the terminals touching (off the battery!)
- Leave the cables clamped in this position for 15-20 minutes and then re-install
*This should clear any soft codes and communication issues with the vehicle’s PCI Bus.*