Hello fairly knew here but looking for help. The other night I was towing my skidloader with my snowplow on the front of my truck. The OD light began to blink I pulled over and read the codes which were po603 and po713. During this my trans gauge read 100-110,the fluid smelled fine and was just warm,and the truck acted fine and still does. Also a couple of weeks ago I had an issue with my speedo going up to 10 in park when I put my foot on the brake. It also was effected by having lights on or off or my trailer pluged in, not trying to side track but wondering if it could be related. I had a ford mech. suggest a bad ground some where for the speedo problem,so I cleaned the ones I could get to. I am thinking sensor,voltage,tuner,or wiring problem. Sorry for the super long post just wanted to paint the whole picture. Greatly appreciate any advice and I love the site.


2001 F-250 cc 4wd 4" exhaust,6637,superchip 1705,and tci torque converter

 

Voltage drop across TFT sensor exceeds scale set for temperature -40°C (-40°F).

Most of the test seem to point to the harness connector at the tranny (loose connection, pushed out pins, corroded wires, ect)

 

Ok I will crawl under it tommorrow and take a look the trans was replaced about 7 months ago but we get a ton of road salt around here and I am sure the plug on the truck side could be corroded. Thanks alot.

 

That male connector on the tranny is oriented vertically, and it can get full of water. I had a Banks trans command installed at Camping World long ago, and they left off the o ring that seals the connector and water got in there from running through a deep peddle, and my OD light started blinking. I mention this because someone just had your connector off to replace the trans, and it's very easy to screw up that o ring. I had to soak up the water using a number of Q tips and working them around the pins, then spray it out with CRC circuit cleaner and let it dry good, then reassemble using dielectric grease.

 

Shortly after running through puddle and getting water in tranny connector and fixing myself, engine started missing and dying. Replaced cps myself, and also used a little DG on it, just around where it fits together to seal it. My engine problem returned (this was long before I had internet and knew about FTE) so I went to dealer. I watched tech replace IDM and then completely load that connector with DG, he put it everywhere!

As a EE I said isn't that going to screw up the connection. He said that he's done it that way for 20 years without a comeback to make sure it seals out all water and moisture, and that if the pins aren't a tight enough fit to push the DG out of the way as the pins enter the female connector and make a clean connection, he'd rather know now than later. I told him about running through water when I went in and that's why IDM was suspected. I decided while I was there I would test his approach, so as he was replacing the splash guard, I grabbed his jar of DG and did the same (filled entire connectors with the stuff) on every one I could find under the truck, tranny, cps, vss on diff, etc..

That was many years ago, I've run through much water since, and I've never had to touch any of those connectors. So, he seems to be right about DG, however IDM didn't fix my engine miss, it turned out to be to UVC, but by then I was 1000 miles down the road at another dealer!

 

I'll second the dielectric grease. If I touch a connector it gets a dose,...........cheap insurance.

 

Yes I am all for the dielectric grease I use on all my plow connections and when I went through and addressed all of the grounds I could get to, so as soon as it warms up alittle in an hour or so I will go out and do that. This all makes I am anxious to try these suggestions. The thing I am running into with this truck is that it had very low miles 16,000 when I bought it a year ago but it sat alot and was probably driven in bad weather and salt and then parked for a while.