One problem related to emission control has been reported for the 2001 GMC Jimmy. The most recently reported issues are listed below.
Service engine light has come on a total of 7 times in 8 weeks (all with in 2 months). I was told by dealer secondary air pump was bad. Part was replaced a number of times. I called gm's customer assistance center. They offered no help other than to call a GMC dealer and have them take a look.