Hello to everyone! I have a 2006 GMC 2500 HD diesel. The check engine light came on with several codes. Did not notice any power problems but here is my book of codes.
P0647
p0646
p0206
p0207
p0208
p0507
p0506
p0650
p0299
p0234
p0191
p0087
p0088
p0615
p062C
p0502
p0540
u1096...