camshaft

I have an 07 Tahoe LT that has had the check engine light on for months and V4 mode is disabled and the car idles rough had seems to have lost power. The code is P0016 Camshaft/Crankshaft Pos Sensor (Bank A). I replaced the sensor and flashed the computer to reset. Light came back on, still runs...

I'm expierencing some type of electrical problem and need some help. The camshaft posistion sensor code p0340 and speed sensor codes p0500 &502 all came on at the same time once the speed starting acting erratic and wouldnt work. The abs light came on as well. I replaced one of the 2 speed...