there are 2 'learn in' procedures (Idle air volume ) that need to be done when we change out a ecm or regulator on these trucks. one is just a turn the key on for 5 seconds without starting the motor, the other requires the software and cables.
Are you positive you have the correct ECM for your year and model truck? an ecm for a 2005 will not work in a 2004 built unit and if my (ancient) memory serves correctly, an e38 is the code it throws. One has a 'relative' pressure sensor, and the other an absolute pressure sensor.
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