Using hypertech with stage 2 program on the truck, which is 70hp boost. been like that for about a year. two weeks ago i decided to go stage 3 (90hp). it was great, couldn't believe the power differences. yesterday morning, i used the remote start like every morning. the truck failed to start, tried it again, same thing.
so i went out to check it over. made sure i had fuel, nothing loose, pumped the fuel primer just incase. nothing. disable the alarm, maybe it was the kill start. not it. i than decided to check for DTCs. and this is what i founded.

B2960
P1631
U1151

i cleared the DTCs. restored the factory program and it started fine.
then i reprogrammed it to stage 2. it ran fine all day yesterday and today.

Can someone tell me what the DTCs mean?
I would like to go back to stage 3 but i'm afraid to.
any input would help.

Also where can i get a copy of all the codes.
buy, download, where ever?

Thanks
Vin

B2960 - Security system sensor data incorrect but valid
P1631 - Theft deterrent start enable signal not correct
U1151 - Loss of serial communications for class 2 devices

Starting point for DTC codes http://www.obd-codes.com/trouble%5Fcodes/gm/
A good site that is fee based is http://www.alldata.com