code P1600 after putting different ecm How do I clear it.

Question

I just put a used computer in it and how do I clear this code I have no idea I unplugged the car battery for 15mins tried clearing it with   obd II code reader.

Answer 1

P1600 ECM battery malfunction

Unplugging the battery will not clear the code, what you have is a wiring issue, when P1600 set the ECM will not set any other diagnostic code, what happens is it battery supply to the ECM is not present when the ignition switch is in the off position, The first step is check the fuse for any open condition in the engine fuse relay box.