99 passat 2.8, vehicle was driven the night before, ran great, next morning battery dead. has code p 1545, charging system does'nt appear to be working, jump started with volt meter hooked up just battery voltage, off idle (part throttle) rpm very erratic, fluctuates
That code is a Throttle Position Malfunction code.
This means one of two things:
1. The throttle body needs replaced
2. After the dead battery, you need to adapt the the throttle body.
The cheap way to do this is to leave the driver's door open, turn the key to the on position, but do not start the
car. You will hear the throttle body self-adjust. This may take up to 2 minutes. That should get it
close enough. To get it perfect requires a trip to the dealership.
If it does not help, the throttle body might be dead.
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P1545 is the code for Throttle Valve Control System MalfunctionThe throttle body has probably failed on the car. Have a new one put in, or have it rebuilt and then have the shop do a throttle adaptation with the proper scan tool. Doing this should fix your problems.
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