Twice in the last two weeks I've had my check engine light come on, and then go off again after a few driving cycles - the first time, right after I brought it into the shop, which sent me on my way with a "come in again if it comes on again" wave.

The codes it's throwing are U0100, U0073, and P0700. There are a few threads sprinkled around the internet for a similar code group for Silverados and Tahoes. The most frequent suggestion is that there's a burnt-out buss bar fuse, and the most frequent response is "the fuse is fine, dangit."

I'm not sure if a burnt fuse's the case here, since the light goes out.

But before I take it in for more serious service, has anyone else seen these codes in this grouping? What was your solution?

</crowdsourcing>

 

Did you ever figure anything out on this? I'm throwing the same codes!