Pontiac Problems? Ask a Mechanic for Answers ASAP
1st thing to ask is if the dash is lighting up as it should ?as if the dash is cold and dark then the ECU won't be powered up
I'd suggest to 1st check if the ECU / PCM fuse has 12V with the ignition on
if it has then I'd move onto checking the connections to the crank sensor and consider replacing it with a new part#
OK in that case the security system isn't working correctly then
I'd 1st suggest to replace the battery in the keyfob and then ensure that the car battery is fully charged and also
then I'd try resetting the ECU by disconnecting the battery cables and clamping them together for 10 mins. Remove both battery leads from the battery then use a nut and bolt or G-clamp to hold both battery lead terminals together.
This discharges any capacitors / memory within the ECU and around the car so ensures all memory settings are wiped clear - back to the factory default.
This will reset all the systems on the car and you may need the radio security code to get it going again, and ensure that the keys are in your hand when you re-connect thebattery as the car may lock and turn on the alarm
if we can't clear the DTC then either there's a fault with the key or there's a short on the theft deterrent circuit
the attached diagram should help you trace the dark blue wire from the body control module and check it for damage / hard sections