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47RE Trans Over temp light

by jeffreyd1 on Aug 11 2017, 3:56 PM

'03 Ram 2500 w/ a 5.9L & 47RE transmission. Getting an over temp light on the dash. Have a transmission temp gauge installed & not overheating. Also shot the transmission w/non-contact thermometer & verified that temp gauge is accurate. Scan tool is reading over 300 degrees on trans temp. Pillar gauge & non-contact thermometer are reading 185 ish degrees. The over temp light is coming on consistently between 180-185 degrees. Replaced the transmission temperature sensor. Same thing. Any ideas?

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5 Replies

By hfs454tech Aug 07 2018, 6:22 PM

check trans temp harness

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By jeffreyd1 Aug 22 2017, 11:54 PM

Figured it out. Determined that it is directly related to transmission temp & therefore not likely an external problem. Took a guess & replaced internal transmission harness(part of solenoid assembly). It plugs into transmission temperature sensor. Although no visible damage or problems, it is all good now. Was a bad internal harness.

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By vulctech1 Aug 16 2017, 2:42 PM

I would verify where the actual sensor is getting its ready from and verifying that the location is not actually overtemp . seen cooler flow issues when towing causing this light and then limp mode

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By shadetreetech Aug 15 2017, 8:29 PM

I have read there is a ground behind the drivers wheel well; consisting of about six grounds; that come loose and corrode. I have read they cause multiple issues including transmission problems and torque converter clutch surging. Hope this helps!

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By jzgrandnational Aug 15 2017, 8:09 PM

check resistance on the circuit and make sure its not open somewhere. Also the chance that its a faulty sensor but i would print out a diagram and look at the wiring first.

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