My truck keeps marking u0100 I already changed EC

Question

I already changed Tcm and ecm problem still the same help me please I have transmission 6l90

Answer 1

Is the instrument panel in place ? When it comes to communication code, it depends on what moduel set the code. Depending on the scan tool , 3 control module that are looked at is the ECM, the TCM and BCM . when a U code is set the faulty control module is the module that did not set the code, You now just have 2 possible solution the the ignition switch or the BCM.