For Honda and Acura models ICC can calculate PCM access codes by VIN for using with OEM diagnostic equipment.
To calculate a PCM access code you need to enter last 5 digits of VIN as shown on picture.
PCM Code is required in cases when all car keys are lost or PCM/ECM Immobilizer replacement. Please note, PC date settings are must be correct because all of secret codes are calculating for the current day only.
Honda Diagnostic System - PCM Code:
enter code as shown on picture