2002 GMC Envoy's computer won't reset after repairs, we were told to drive it, and we have but it still isn' t resetting, how many miles does it take?

Sometimes it can take 100 miles or so but it also depends on how you drive. Short trips aren't going to do it. You may need to get it out on the highway and get it up to temp a few times. What exactly isn't coming up as ready with the readiness monitors? Alex