 Very unreliable and very poor powertrain and electronic system design. Started experiencing shudder at 89K miles when the automatic transmission moved between 1st and 2nd gear. Symptom did not occur over two day period until driving on third day where the issue worsened rapidly until transmission became inoperable above 10 mph. I investigated the issue and learned that this is a well known issue with the Pathfinder where the radiator fluid fails into the transmission, causing both the radiator and transmission to fail... great design! My transmission and radiator are shot at 89,000 miles. Looking at $6000 repair bill that I will not pay.