One problem related to engine head gasket failure has been reported for the 2006 Suzuki Grand Vitara.
Sat 1/3/2006 Suzuki Grand Vitara died while driving at 30 mph on mtn loop highway. The vehicle simply died-no warning-speedometer fell to zero. Engine light and transmission lights came on after trying to restart engine. Restarted vehicle and drove a short distance to get it off of the road. Could not start it later. Had it towed. 1st repair shop found spark plugs gummed-removed the valve cover. "requires replacement gaskets and other parts-it appears the key for the timing "chain" broke and came off-need to dismantle more of the engine. " they did. The damage appears to be bent valves and the broken 2-piece gear". They discussed rebuild versus engine replacement being potentially a less expensive option. Found out that power train still under warranty. Under warranty were required to send to a dealer shop. Had vehicle towed to dealer shop-their diagnosis-apparent problem is two gears that work to drive the cam separated after one gear broke. Left valves are bent and need to be replaced. Machine shop work is required on cylinder head. Suzuki's customer service center: case # 2-181089136-2-piece gear had a distinctive crack. "the ". Engine head was sent for machine shop work is back-2/10 work cannot start until 2/16 or later. They have said there is no damage to the lower engine. Do not know about availability of broken parts. Vehicle still at shop. It has been out of service since 1/3/2009.