2002 VW Passat running fine. Stopped for errand

be checking emissions controls for vacuum leaks especially with the brakes..

Could be many things. I'd check the battery first. Make sure it's holding a charge/ not dying. There's several other problems that could cause this so check battery problems first. If it's not the problem, let us know. I/others can suggest other things to check.

Rock Auto

always get a second opinion from an accredited professional a transmission shop that works on your make of vehicle
may be a simple tcm /pcm or other electronic control module
To have the necessity to replace the box , the water would have had to get into the transmission or the mechanical/electronic sections

HI,
Passats can be reset if the radio is pulled out and the fuse on the back is removed. Wait for 2 mins, reinsert the fuse and turn the radio on. If this doesn't work, please take it to the dealer for the unlocking of the code, for which he may charge you some fee.

Do let me know if it was helpful.

Regards
Kanu

ignition module

Bad fuel pump.

There is an electrical relay that is malfuctioning. I had the same problem on my 2000 VW Passat. I just got it fixed, part cost 48 dollars and labor will be about an hour.

sounds like a faulty wire,possible on the ignition circuit or faulty battery leads.

it sounds like your computer went bad, somethings do not go to the computer like the radio and lights but all the sensors, ignition system, and locks witch im going to guess that you have a car alarm. if not even thow the computer tells all the locks to lock with one push of a button. you would have to take it to a garage theres a chip that has to be removed and put in the other inless the chip is the promblom but unlikely