P0405

[lil_sleazy1]

Last Thursday my street flooded and unfortunately my car was parked in the street. After the flood I tried to start the car but it wouldn't turn. Another odd thing was that it read low fuel when I had at least over half of a tank. I installed a new PCM but it still will not start. The water came about half way up the rim. I haven't had my new PCM flashed yet. It still reads low fuel too. Also only the instrument panel is working and after about a minute the air conditioner tries to come on without turning it on. 1999 A4 Coupe: P0122 P0405 P1336 What is keeping my car from starting?

[Y2Kvert4me]

You need to flash a stock tune into the PCM before trying to run it, or before doing any further troubleshooting.

The P0122 is a throttle position sensor low voltage code.
The P0405 is an EGR code, which is not applicable to a Vette, but since you have no tune in it at all, this is probably why it's setting.
The P1336 is the "crankshaft position sensor not learned yet" code, and this occurs when you swap a PCM without doing the relearn. Just flashing a tune in it may solve this one too, not sure.

None of these codes should prevent the car from cranking, and since you said "it wouldn't turn", it leads me to believe you have another issue going on, perhaps starter related.
Even with the PCM completely out of the car, it should still crank, as the starter motor is mostly direct battery-to starter connections, with some input from the BCM (theft deterrant relay), allowing the starter motor to run and crank the engine.

Did the water level get high enough to soak the interor/floors?

[lil_sleazy1]

Originally Posted by Y2Kvert4me

Did the water level get high enough to soak the interor/floors?

Yes, water did soak the interior. And when i do turn the key nothing happens, just silence from the engine and starter. Also, i don't know if this makes a difference or not but the radio will not even come on. Would the theft device lock the car down?