NHTSA Investigates Complaints on Nissan Truck, SUV Transmissions
The National Highway Traffic Safety Administration's Office of Defect Investigations has received 512 consumer complaints between August 2005 to May 2012 about transmission problems on 2005-2010 Frontier, Pathfinder, and Xterra models equipped with automatic transmissions.
The culprit is believed to be the contamination of transmission fluid by radiator coolant. The automatic transmission fluid (ATF) line runs through a coolant chamber in the radiator to bring the transmission fluid up to optimal operating temperature more quickly, but the line in the radiator is believed to be prone to cracking, which can cause contamination of the transmission fluid.
If you own one of these models and have experienced transmission issues, you can contact NHTSA at 888-327-4236 or Nissan's Consumer Affairs Department at 800-647-7261.