Three days now .after 10-12 miles trans. temp. light is coming on and automaticaly engaging tow\haul mode. Changed trans filter -blew out cooler/lines-disassembled/cleaned air cooler thermostat.. Fluid level seems fine.Fluid does not seem real hot when checked .I"ve felt much hotter under normal operation.Could this be a temp sensor problem? Need truck DAily Any Help is GREATLY APPREICIATED!!

 

Year of truck would help

 

Sorry -04.5 Dodge Ram 3500 Auto 180k Miles 4x4 600 Ctd

 

Check for restricted cooler flow. Take line off at rear of tranny. Must flow in excess of quart ATF in 20 seconds. Don't empty tranny and can be very messy.
Possible failed trans temp sensor (or shorted wire) in tranny and part of governor pressure transducer.

 

You hit the nail right on the head . Thanx, Governer pressure transducer.A MUST HAVE SITE 4 DIESEL TROUBLESHOOTING!