Remote Start, 2000 GMC Sierra 1500

Hi there, I hope someone can help. I installed a Compustar CS800-S in my truck. I used a resistor to bypass the pass lock 2. And I used a relay method for my locks. But my issue is is that it's giving my engine codes and defaulting my engine into 2nd or 3rd gear. That being said, can I use the directed 451m instead of the relays I used to convert my polarity from + to -? When I got my truck it came with remotes for the locks and alarms. Does that change the polarity of the wires? Or would the automatically be + and I still have to change it to -? I'm fairly confident in my installation but it's not working and I don't really know wiring. Just trying to follow another postings lead. If I have to, I'll buy the 451m and the avitol unit. But would my issue with my tpm throwing codes P0740, P0753, P0758, P0785, P0787, P0973, P0976, P1860, P2761, P2764 and/or P2769 be solved by using a 451m unit? Or could it be the whole remote start unit? Or my installation? I spent hours carefully installing using a wiring diagram and checking my installation manual to make sure all the polarities were the same, and when I first tried the unit, it started no problem. Just seemed to be after I installed for keyless entry I accidentally shorted out a 12 constant wire. I also have other gmc issues such as gas gauge, my 12 volt cigarette lighter is tripping the fuse everytime I use it or plug in a obd2 reader Thanks guys and gals, I know it's probably alot but its my first time posting. Thanks for the help if any

My bad I forgot the info.. I have a 2000 gmc sierra 1500

Did you connect the white 2nd ignition wire? It must be connected for this vehicle.sparky

+1 with Sparkie...Soldering is fun!

I'll have a check tonight when I get home. Appreciate the help. I'm pretty sure I connected all the wires, but I'll double check. Thanks guys