GMC Jimmy owners have reported 3 problems related to transmission not engage (under the power train category). The most recently reported issues are listed below.
The vehicle failed to engage in a higher gear, the vehicle only went 5 mph.
 
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all problems of the 1996 GMC Jimmy
🔎.
Automatic transmission gears do not engage properly while driving. Dealer has been contacted.
 
See 
all problems of the 1997 GMC Jimmy
🔎.
While driving consumer automatic transmission gears do not engage properly, it also stalls on an intermittent basis. Dealer has been notified of this problem. Please provide further details.