Discussion Starter · #1 ·
I have a 2008 F350 crew cab, LB, with the 6.4L diesel engine. It has a Dashdaq programmer running the recommended tune for best fuel mileage and DPF/EGR delete. It is actually getting 17 MPG consistently with 1000lbs of tools and fiber glass cap on back. Recently it started throwing a P0740 TCC DTC. I checked the undercarriage and electrical connections and all is spotless and clean. I removed the connector on the drivers side top of the transmission above shift linkage and the clip broke when I removed it. I contacted the local ford dealer to discuss replacing the broken plug and was advised to zip tie it on and it should work fine. I cleaned the plug that already appeared clean with contact cleaner and a soft tooth brush. Reinstalled and zip tied it down tightly. This seemed to improve the shift and feel of the truck and definitely delayed the reoccurrence of the issue after deletion of the code from the ECM. When the code reappeared it had a friend P1744. I then drained the trans fluid which was dark but did not smell burned and the pan was spotless, no metal at all. I replaced the TCC solenoid, pan filter and refilled with the required Mercon LV Fluid. I can now drive the truck, up to a day or so and if I do not use cruise control, and I guess I have learned how to feel when it is about to throw the code and I back out of the throttle a little and it prevents the issue. What should I do next vs. giving up and taking it to a transmission shop? I have addressed both of the issues that the codes direct you to do.