My son screwing around with **** turned a/c on? it,s 35 degrees outside truck was dead when i came out truck started back up but check engine was on tach was also dead cleared code restarted tach working but idiot light still on truck is also missing ever so slightly. cam pos sensor?

 

P0341 (M) Camshaft Position (CMP) Sensor
Signal.....Problem with voltage signal from CMP.

I'd disconnect the batteries for a half hour then go on a ride.
You may need to go to a chain type auto parts store to get all the diagnostic trouble codes read in case there's a pending code stored.