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toofastgtp

What The.. P1600

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So after a major rain storm my car started to throw a P1600 (Batt ECM)

Checked my fuses and all good. What else do i need to check?

The car seems to run fine out side of a slight ruff idle but not really noticeable unless your paying attention. If my ECM was really bad wouldn't my car run like complete crap or not at all?

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Have a look at this thread: P1600

Most likely the power to the ECU backup terminal is compromised or getting <9Volts. It cannot store and keep it's 'learnings', explaining the rough idling. You need to check the harness and/or power going to it.

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