How-to: calculate Honda HDS Password (first password, second password, release password and PCM code) using Godiag GD101 J2534 cable and J1979 tool. To calculate these passwords, you need to download a J1979 Diagnostic Tool for Godiag J2534 1st Password: Required for adding new keys or clearing old/lost keys. 2nd Password: Also known as Release Password, it is required in cases when you’ve entered wrong codes. 4-digit PCM Code Required in cases all keys are lost or PCM (Powertrain Control Module) / ECM replacement. Supported features: PCM/ECM initialization and Key programming Supported equipment: Honda Diagnostic System (HDS) Using first password you can add key to existing ones in immo system. If your attempt fails, then working keys would not start the car, because procedure was not completed. First password will not be accepted anymore. You need to restart key adaption and, in this case, you a...