A practical diagnostic guide to GM BCM problems — how to tell a bad BCM from a wiring, relay, or Passlock issue, and when cloning is the right repair.
Category Archives: ECU / ECM Reprogram
ECU / ECM Reprogramming covers the software side of engine control units — flash tuning, cloning donor ECUs, VIN writes, and immobilizer deletes. Modern ECUs store VIN, immobilizer keys, and tune data together, which means swapping an ECU without programming usually won’t start the car. This category documents how we handle bench programming on Bosch ME/MED/EDC, Continental SIMOS/EMS, Delphi PSA, Hitachi, Denso, and Siemens platforms. Browse the posts below for specific platform writeups or order nationwide ECU service from the shop.
How to clone a GM body control module, which vehicles the service covers, what the BCM actually controls, and why cloning beats dealer replacement.
How Subaru immobilizer systems tie the BIU, cluster, and ECU together — and how to recover when keys are lost, modules fail, or a used donor does not match.
Everything Subaru owners and techs need to know about ECU cloning, IMMO programming, and key matching across Denso, Hitachi, and Bosch Subaru ECUs.