This, in my opinion, could be the real eye opener.

Lets say the MIL of your Silverado just came on.

[...] sr=1-10/ref=sr_1_10/[...]-7334438?s=books&v=glance&n= 283155 [[...]] This will tell you you need a scan tool to pull the codes.

[...] 13352_2/[...... Login to read more.