We've updated our reliability stats for the Grand Cherokee to include owner experiences through September 30, 2016.
Repair frequencies, in terms of repair trips per 100 cars per year (lower is better):
2004 Grand Cherokee: 168, high, small sample size
2002 Grand Cherokee: 123, moderate, very small sample size
Additional participants always helpful.
For the repairs behind these stats, reliability information on other models, and to sign up to help improve this information:
Jeep Grand Cherokee reliability ratings and comparisons