Driving the Tahoe tonight, and kinda “stepped on it”, to accelerate quickly when all of a sudden the check engine light came on and stayed on and the DIC displayed “reduced power.” I could still drive it although slowly. Got the car home ( only about 3 blocks away) and turned it off immediately. (The strange thing is, I drove the car all day today with no problems whatsoever, on the freeway on the streets, etc.) Parked the car for five minutes went back out and started it up… no check engine light no ‘reduced power’ on the DIC... drove it for a couple of miles and it was just fine, as if nothing happened. Weird! So, I guess now I need to get one of those things that reads the error codes when you plug it into the onboard diagnostic port, to find out what’s going on! What do you call it, and where do I get one?