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Dropped my procharged C6 off at a shop to get aftermarket clutch replaced because it would be easier on their 2 post lift rather than our 4 post. Picked the car up and it had lots of issues. lots of loose parts, and the car wouldn't start. Long story short, i jumped my auxiliary to get it home and was going through everything. took apart the fuse box to find lose contact for main fuel pump. fixed it all up and tightened all of the lose stuff the shop didn't torque properly. I had also found a lose ground in the driver rear. after cleaning and tightening the ground, went for a test drive I noticed the the "service active handling" on the dash ,and the SPEEDOMETER AND HIGHBEAMS WERE NOT WORKING. As well as a P0650 for the malfunction indicator lamp. I had checked every fuse for BCM and high beams everything looked good. Checked all the speed sensors and they were all plugged in and secure. I'm not sure what to do next because it was just working a few hours before. ANY HELP? thanks
C5s have about a dozen "ground packs" where a bundle of grounds come together in a connector that bolts to the chassis. When one comes loose or gets corroded, you get a bunch of electrical gremlins that all seem unrelated. I suspect that C6s are the same. Try a web search for "c6 ground pack locations" and see if something comes up... then check each of them.
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Electrical Issues. 
