Truck had some issues. Parked for a couple years. finally got around to fixing and now the trans is acting up. I'll add the codes shortly, one is the output speed sensor that went out before it was parked. If i remember correctly it was a communication code. Basically is runs perfectly in reverse, but in drive it goes directly into 4th gear and stays there no matter the speed. When I put it in drive I can see on my CTS monitor, it is in 4th. I've checked the connection of the main harness(unplugged it and plugged back in). Its a stock trans I put in about 5k ago out of a wrecked truck. This trucks 4th trans. Is it time for a 5th? Or can I save this one? Truck is the 06 in my signature. Heavily modified.

 

Here are the codes-

 

I would change the speed sensor. Inspect the harness and connectors for any faults. Clear the codes and see what happens. B.

 

Maybe Mark K will come on and give you the definitive answer, but Linden prolly has you headed in the right direction. I'm assuming the OSS is the sensor located on the top back of the transmission. It should be easy to replace (at most, you might have to drop the rear cross member to lower the tail end) and prolly doesn't cost way too much. However, IMHO, and random guess, it's more likely a harness issue (especially if its the same harness that's been used on all those transmissions), and the harness is even easier to replace and also doesn't cost much.

I assume the Fseries trans harness is the same as the Eseries - it comes in three sections and each are about $100. You could take the middle section off - it's easiest to remove, disconnects on top of the bell housing, two sensor connects, then disconnects on the passenger side going into the casing - and is the one that connects to that tail shaft sensor (again, assuming it's the OSS), then ohm out each wire to confirm it's integrity (speculation on my part - I'm ignorant about electronics). If it's good, then do the same for the first section that goes from the PCM to the bell housing, or just ohm out the pins that carry the tranny signals (that section has other wires as well).

The last section is inside the transmission, but still isn't a major project. You have to drop the pan and remove the solenoid body. It just has a few connections to unsnap.

I've done all of them and only screwed up once - the 10mm bolt that holds the middle section to the casing where the third section connects stripped out on me - which is normal for me. Most guys wouldn't have a problem. I got the feeling from Mark K that harnesses are the problem way more often than internal parts.

 

It could be a bad OSS (located on the top rear of the trans) but is much more likely to be a damaged wire between the PCM and the OSS.

 

If I where to guess it "is" most likely a wire. Wires have been an issue so far. But I will replace the sensor first. Anyone know the ford part number for it? Got it -- DY1250

 

Somewhere a dehydrated horse just went belly up.

 

Not sure what that means.

 

He owns a van, they leak exhaust through the doghouse.

 

I was also going to say, if the truck has been parked this long, squirrels, rats, or mice May have built a nest on top of the transmission.

 

A lot of this time it was parked in my shop. But I checked around, unplugged and plugged back in the sensors on the trans. This is the 4 or 5th transmission I've had in the truck. I find them used for a few hundred and swap it in. That's why I'm suspicious of the harness. Anyone have a source for a replacement harness? I have a sensor on the way though.