The ECMs are very robust and rarely give any trouble. However, the one you have might have had the battery connected up the wrong way around or something.
The symptoms you describe aren’t common. But the PATS light and the no start, maybe even the alarm sounding I have heard grouped together as an issue with the key being recognised.
It doesn’t explain the other weirdness.
The workshop manual will have pinpoint tests to follow for each fault that may help you test power to each module and communication.
The symptoms you describe aren’t common. But the PATS light and the no start, maybe even the alarm sounding I have heard grouped together as an issue with the key being recognised.
It doesn’t explain the other weirdness.
The workshop manual will have pinpoint tests to follow for each fault that may help you test power to each module and communication.