One problem related to automatic transmission torque converter has been reported for the 2006 Nissan Frontier. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Nissan Frontier based on all problems reported for the 2006 Frontier.
My vehicle shuddered and felt to slip out of gear while driving! because of this known issue of leaking coolant causes transmission failure. I bought this Frontier with very low miles and was never told of this potential issue from the dealership. It should be a safety recall as it prevents the vehicle from accelerating and if you are driving can cause an accident. I am now reading that Nissan owners have no idea this is happening until too late. Once the coolant is mixed with the transmission fluid this lethal combination kills the valves, seals and torque converter -- rendering your entire transmission useless. I read that this issue is currently contained to the 2005—2010 model years. I have a 2006 with 64k miles! it is only time until this issue causes multiple accidents since this issue happens while cars are driving. Please push Nissan for a recall. I should not have to pay for a known engineering / manufacturing defect.