Looking for help with a flashing o/d light.
I have a 02 Ford Explorer Sport Trac. V6 4.0L with a 5R55E transmission. About 210,000 miles.
A few weeks ago after a trip i discovered i had a coolant leak. It took me a couple of days to figure out that it was the lower thermostat housing. Fixed that and I thought my troubles were over. WRONG.
A few days later the O/D light started flashing and I got to enjoy the wonderful “Limp Mode”. The problem only showed up when I had to slow down for a stop. As soon as I started to go again and it went to shift into second (or overdrive 1st) the o/d would start flashing and hello “limp mode”.
I got on the web and started reading. I ended up replacing the speed sensor (in the rear differential), the crankshaft sensor, and readjusted the bands with no luck. I would have to shut the truck off at every stop sign/red light just to avoid “limp mode”.
Last week I went to a friends shop to have them change the oil and we started talking about the problem. I got him to flush the transmission fluid and look at the codes.
He got the following codes: P0731, P0732, P0733, and P0734. Incorrect gear ration 1 - 4. He cleared them and nothing popped back up.
That cleared up most of the problems.
Same scenario as before but only after I reach 40-50 mph. If I’m just in city traffic it doesn’t pop up. And if I’m driving around with no stop signs/red lights it won’t reappear. But if i get up to 40-50 mph and have to complete stop, as soon as I take off again and it shifts into that second gear (or sometimes 3rd gear) it will go into “limp mode”.
I got a kid on the way and money is tight so it will be a few weeks before i can let my buddy dig into to it. After doing some more reading I’m beginning to think one of the solenoids is acting up, but I wanted to put it out to the community first.
So any thoughts or suggestions.