Question

2013 GMC Envoy with engine code codes P0300, P0305, P0306, P0321, and P0327, what is the codes meaning?

Answer 1

Do you mean P0300, Pxx ... P instead of the C?  Also, There is no 2013 GMC Envoy

P0300 GMC - Cylinder Misfire Detected Random Cylinders
Read more: https://www.autocodes.com/p0300_gmc.html

P0305 GMC - Cylinder 5 Misfire Detected
Read more: https://www.autocodes.com/p0305_gmc.html

P0306 GMC - Cylinder 6 Misfire Detected
Read more: https://www.autocodes.com/p0306_gmc.html