One problem related to gas recirculation valve (egr valve) has been reported for the 2008 Nissan Frontier. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2008 Nissan Frontier based on all problems reported for the 2008 Frontier.
The cooler tubes for the transmission and the radiator cracked, allowing for fluid to leak into the transmission. This resulted in rapid degradation of the friction elements within the transmission. The Frontier is now undrivable.