Something interesting that I just came across for unexplained REP issues on 06-07 ETC trucks:
http://www.gm-trucks.com/forums/inde...=article&id=46

 

I have had to reflash several trucks b/c of that bulletin. Usually its the p1516 that sets, every now and then the u code will come up.... I hate those things!!!

 

I've only entered REP once, and it was b/c I tripped the P0068, the engine shutoff and wouldn't start back up. I was pissed since I was in the middle of an intersection. Luckily I whipped out the laptop and cleared the code real quick. Everyone looked at me like I was an idiot and was playing solitaire in the middle of an intersection

 

That's funny

 

At least I put my flashers on while I am stopped in the middle of the road fumbling with the laptop try to get running again. Do get some nasty looks from people.

Just turning the key off for 15 seconds will clear REP if it was set by a non-persistent issue.