[hinton08]

P0200 has a GM bulletin about the injector control circuit chaffing and shorting to ground on the AC line bracket on the rear of the head, above the transmission. Not sure if that will fix it or not, but just letting you know there is a GM bulletin so its pretty common. P0602 means you need to reprogram your TCM, and if your TCM will not reprogram, or programs but P0602 comes back, you need to replace the TCM. All the other codes are not even showing up on the GM service manual. I would start with the P0200 and P0602 to begin with though. Several wires run thru that harness stated in the bulletin and the TCM completes a circuit to many components as well. Hope this helps!