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What is the year, make, model, and engine size of your vehicle?
It sounds like you might have a bad ECM. If you have a multi meter you can test for a bad TCM with the attached chart.
1. Check powers and grounds to the ECM. If no power is noted on A8 and A16 White/Blue wires, check EFI main relay for proper operation.2. Check for ECM 5 V reference circuits being shorted to ground.
It's not uncommon to find water intrusion in the PCM on this model of vehicle.
I think your ECM is dead. Can you use the chart to test the output on any of the output circuits (ie E6-1 E6-2 E6-3 etc)?