what code are you getting?
do you have a remote starter?
when a key is inserted into the ignition and the switch turned on, a signal is sent to the key which modifies the signal by adding the unique id # XXXXX the signal and sent back to the pats transceiver, if the key id # XXXXX XXXXX the pats system will not allow the vehicle to start, you may have a damaged key, or a concern within the system
let me know if this helped, and if you need any more info
please send feedback so we can serve you better, positive feedback is always appreciated
did you replace the fuse box, or just have it out for access?
do you have a remote starter in the truck?
do you have a second key you can try?
All elements of PATS must be functional before the engine is allowed to start. If any of the components are not working correctly, the vehicle will not start
do you have access to a scanner to check for codes, if so check codes and get back to me