TRANSMISSION HOSE LEAK

What NHTSA is examining

This pe was opened for model year (my) 2008 nissan maxima vehicles based on early warning data that the automatic transmission cooler hose may have pinholes and/or cracks resulting in a transmission fluid leak.the leaked fluid can contact the exhaust system and ignite.nissan has shown that the root cause of the pinholes and/or cracks in the hose is excessive stress during the manufacture forming process resulting in hose deformation at loading onto a mandrel, or damage during un-loading.regarding loading stress, nissan states, when excessive stress is applied while loading the hose onto the mandrel, hose deformation (which looks like a bulge) can occur around the bending area.a crack will start to form on the inside of the hose at the area of deformation.regarding unloading stress, nissan states, after the curing process, in some instances the hose stuck to the mandrel tightly and the operator had to apply a significant amount of force to pull the hose from the mandrel.if this operation was performed roughly, the interior of the hose could be damaged by the mandrel edge. Nissan also states, because of the way the hoses received internal damage, a damaged hose was produced as a rare, random event rather than systematically.the transmission hose supplier, cooper standard automotive, implemented process improvements that limit excessive stress on the hose during manufacture. Nissan has shown that this transmission cooler hose was assembled on my 2007 and my 2008 maxima…

Vehicles under investigation