2003 Pontiac Grand Prix JUST WON'T START!

MICAH.DAVID

MEMBER
2003 PONTIAC GRAND PRIX
6 CYL
FWD
AUTOMATIC
65,000 MILES

Our 2003 grand prix keeps just NOT STARTING. We looked online and found a site that let us know that it was probably a computer/security system and to reset, we needed to unplug the battery and then give it a few minutes to reset itself. This has picked up in frequency and sometimes takes quite a while to get started. Not great for when I need to go to work. Is there something we can do to fix the problem without throwing temporary bandaid on it that won't break us?

1 Reply

BMRFIXIT

MECHANIC
19,053 POSTS

If security light on and blinking as you try to start and not allowing the engine to crank and run
try to reprogram and lean the key
if have to keep on doing it then have to have it scanned for codes
need to use a scanner tool for codes an OBDII reader will not get you the correct codes that you need to security system
scan BCM, IPC and PCM for codes most shops charges about $65 for the service

30 Minute Learn Procedure
Turn ignition switch to RUN position, engine OFF.
Attempt to start the engine, then release the key to RUN position (vehicle will not start).
Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF.
Turn ignition switch to OFF position, and wait 5 seconds.
Repeat steps 1-4 two more times for a total of 3 cycles/30 minutes (the vehicle is now ready to relearn the password on the next ignition switch transition from OFF to CRANK position).
NOTE:The vehicle learns the password on the next ignition switch transition from OFF to CRANK. You must turn the ignition switch to OFF position before attempting to start the vehicle.

Start the engine (the vehicle has now learned the password).
Using a scan tool, clear any DTCs if needed (history DTCs will self clear after 100 ignition cycles).