The van is a cargo van with a 5.4 liter engine and 4R70W transmission. Transmission code is "U". The PCM is setting codes P1747. The overdrive light on the stalk will flash. In gear, a grinding or whine can be heard coming from the front of the transmission with the engine cover off. A bit like something is not engaging. The transmission fluid is full and pink with little to no burnt smell. I have not dropped the pan (transmission fluid is expensive) just to look for metal in the bottom.
History: Before I bought the van it had sat in the same place for about six years and never ran or operated. The former owner thought a new transmission would be too expensive. I got it home via tow truck, started it after a new battery and fuel pump, and took it for a short drive. To my surprise it shifted and performed fine through all gears. Then the codes started and I assume it is now in limp home mode. I pulled the transmission connector and it had transmission fluid leaking up into it (passenger side of transmission). The harness looked good other than the fluid which I thought could be causing a short out. No dice after cleaning it and putting dielectric grease in it. Still p1747 and noise. It is at the point where I will not drive it for fear of destroying the clutches.
Could the computer be killing its own transmission?
have the same problem?
Friday, December 9th, 2016 AT 4:32 PM