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I am sure this has been brought up in other Topics but I cannot seem to find an answer so here it goes... I have a 2007 GMC Sierra SLT CCSB 4x4 5.3L M engine, on Saturday afternoon I disconnected the ground on my battery to add an aftermarket sub and amp tapped off of the Factory Bose amp. After wiring everything up correctly (just running wires) not even installing the amp or subs I decided to reconnect my Battery and fire up the truck... Funny thing is after plugging it back up and going to start it, it immediately said Service Air Bag, and would not start.. I have checked fuses under the hood, under the dash and on the instrument cluster fuse box and all my fuses are good and working! All doors, windows, lights, remote lock, unlock and alarm work but the truck won't start I have tried the 30min key relearn and redisconnecting the battery for 30 min. Normally my truck has a TPMS Service light on due to me having a bad sensor but it isn't even on right now! Everything works but it just won't even crank it just dies in a sense (it acts like it loses power but as soon as I release the key from start position everything comes back (lights up as normal) seems like I am locked out of the system. Scanned with a Snap On code reader with personality keys... I get a B1370, B1011, U0140, P0690 and a airbag code that I don't recall (I'm at work) after clearing the codes only the B1370 and the Airbag code return.The Service Engine soon light isn't even on either I only get these codes with the snap on scanner.. they don't even show up on my basic scanner.. Yes the battery is good also tried jump starting it just in case checked all fuses and relays, starter works with forced relay and key on but will not start also replaced my ignition switch. Another off topic question is what does The TP in the under the hood fuse box diagram mean? it has it near the 41 Fuse it says TP twice then at the bottom it says TP and has like a book with a key next to it... I'm at a loss right now with what the issue is any help is Appreciated!