LLM1250 Report post Posted December 21, 2017 My 2000 F-350 V-10 4x4 Over Drive light just started flashing last week. The vehicle has 90,000 miles on it. I just purchased it 8 months ago, so I'm not sure if the fluid has been changed...any ideas on what I should try first ? I took it to Oreilly's Auto to have the codes checked. My codes are : P1000 P0783 Share this post Link to post Share on other sites
Moses Ludel Report post Posted December 22, 2017 LLM1250...Here is the CliffsNotes version of the P0783 Code: P0783 FORD - 3-4 Shift Error...Read more at https://www.autocodes.com/p0783_ford.html. You'll find a nice website for quick referencing DTCs. The P1000 code would be incidental, it has more to do with code reading and clearing. This could be created by the AutoZone read. I would do a TCM code read before replacing any parts. That could narrow down your possibilities. The transmission controller is key to pinpoint diagnostics. The P0783 code simply provides a ballpark range of potential faults although you can use this DTC/P0783 as a troubleshooting place to start. Moses Share this post Link to post Share on other sites