GMC SIERRA P CODES (POWERTRAIN) P0100 - P0199

The A/c Was Blowing Hot. Condenser Pulley Engaged. Added 32oz Can Of Freon To Low Side. The Needle On Gauge Was Dropping As I Was Adding It...

Truck Listed Above Is A Sle Duramax 6.6 Diesel Crew Cab. The Truck P0101 And P0102 Codes Most Often Is P0102 Code But There Have Been...