1998 Chevy Silverado code P1631

TONY SCHULZ

MEMBER
1998 CHEVROLET SILVERADO

Electrical problem
1998 Chevy Silverado V8 Four Wheel Drive Automatic

how to fix code p1631 theft system password incorrect

Sunday, November 1st, 2009 AT 11:18 AM

1 Reply

BRIAN 1

MECHANIC
1,030 POSTS

Try this relearn, Attempt to start the vehicle (the vehicle will start and stall), after the engine has stalled, leave the ignition ON for 10 minutes (the security light will remain ON for 10 minutes and then go OFF).
After the Security lamp turns OFF, turn the ignition OFF for 30 seconds.
Again, attempt to start the vehicle (the vehicle will start and stall), after the engine has stalled, leave the ignition ON for 10 minutes (the security light will remain ON for 10 minutes and then go OFF).
After the Security lamp turns OFF, turn the ignition OFF for 30 seconds.
Again, attempt to start the vehicle (the vehicle will start and stall), after the engine has stalled, leave the ignition ON for 10 minutes (the security light will remain ON for 10 minutes and then go OFF) or until DTC P1630 sets.
Turn the ignition OFF for 30 seconds.
Turn the ignition ON and wait 30 seconds.
Attempt to start the engine. Post back with what you find.