Welcome to the forum!
As it sounds like you know, powertrain code P1633 "indicates that the Keep Alive Power (KAPWR) circuit has experienced a power interrupt." According to the factory service manual, possible causes for this code are:
- Open KAPWR circuit
- Damaged PCM
- Intermittent KAPWR Circuit
Have you recently disconnected the battery or possibly pulled the fuse to the PCM? If so, try clearing the code and see if it comes back. Also, inspect the battery cables to make sure they are clean and tight. You may also want to monitor the battery voltage during an engine start condition. If the battery voltage drops below 10.5 volts, that could be the source of the code and you probably need to replace the battery.
-Rod
10-18-2007, 09:34 PM
