Keith Browning Posted June 3, 2014 Share Posted June 3, 2014 Happens to be bolted up to a 6.2L in a 2015 F250 but appears to be the same as all other years. The truck has under 600 miles on it and looks to be in perfect condition and the trans operates perfectly (until the wrench light comes on) The only code in the PCM is a P1783 for transmission over temp condition. My initial road test did not reveal anything so I installed a new TFT sensor because I have seen plenty of those go bad. With my post repair road test I decided to stay out longer and observed the transmission temp slowly rising until it reached 240 as I returned to the dealer. I was not pushing the truck by any means. I have noticed a buzzing type noise from the transmission - like a fluid valve type buzz... So I started looking at the cooling system. I put my hand on the cooler hoses and the return line was cold and the inlet was luke-warm. A cooler flow test revealed good flow. From there I disconnected the lines at the trans and hit them with regulated air but there appears to be no blockage. I also looked in the bores for blockages... none. Just running this by you fellas to see if anyone has run into this yet. I guess I have to get the Hot-Line involved at this point. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted June 4, 2014 Author Share Posted June 4, 2014 Update: cooler flow was blocked by the cooler bypass valve/thermostat which was stuck in the valve body. I could not get it out of the body to inspect the bore so the truck gets a new valve body. Quote Link to comment Share on other sites More sharing options...
Brad Clayton Posted June 5, 2014 Share Posted June 5, 2014 That's what I thought it was........figured you would want to sort it out for yourself though. Quote Link to comment Share on other sites More sharing options...
Aaron Posted June 5, 2014 Share Posted June 5, 2014 ^^ you... You're very very good you... Lol Quote Link to comment Share on other sites More sharing options...
Brad Clayton Posted June 5, 2014 Share Posted June 5, 2014 Quote Link to comment Share on other sites More sharing options...
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