trouble codes

[kkchevy3]

so im checked my codes on a whim today and got a few. 12 33 27 15 47 54 55. now i have been using my winch lately, i dont have ac, my voltmeter has been reading 18+ since it got cold but i checked the battery and its right around 14 while running. any ideas on the other codes?
27** Injector Control Circuit Fuel injector output driver does not respond properly to the control signal
15** No Vehicle Speed Sensor Signal No vehicle speed sensor signal detected during road load conditions
47** Charging System Voltage Too Low Battery voltage sense input below target charging during engine operation. Also, no significant change detected in battery voltage during active test of generator output circuit
54** No Cam Signal at PCM No camshaft signal detected during engine cranking