One problem related to catalytic convertor has been reported for the 2006 Jeep Grand Cherokee. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Jeep Grand Cherokee based on all problems reported for the 2006 Grand Cherokee.
2006 Jeep Grand Cherokee 65th anniversary edition: 15 days off the lot when while driving 15-20 mph engine completely died. I could not steer to the side of the road. There were no warning lights or any indication of a problem. Dealership diagnosed "major internal engine failure" and replaced with new engine. About 4 months later rattling sound turned out to be catalytic converter that needs to be replaced. Still waiting for the part. SUV still does not drive 100%. Sometimes when I step on the gas the truck does not respond right away.