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Transmission temperature sensor

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Old Aug 4, 2016 | 06:31 PM
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Transmission temperature sensor
Ok a while back, my temp gauge for the transmission pegged and I got a warning to check my transmission Temps. I replaced the sensor, put all new fluid and filters (all Motorcraft). Problem solved, or so I thought. A month or so later, it started up again. Flashing tow/haul light, erratic shifting, refusing to go into overdrive periodically. So I repeated the service thinking maybe I got a bum sensor. Problem solved, or so I thought. I made it about 3 miles before the same symptoms started back up.

Anyone have a clue as to what could be causing this?
 
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Old Aug 4, 2016 | 07:07 PM
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is the sensor Pegging and Erratic again


What digital number does it show
 
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Old Aug 4, 2016 | 07:29 PM
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Yes it's acting like it reads for a second then stops back down. I don't have a scanner
 
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Old Aug 4, 2016 | 07:38 PM
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Before you buy more parts that may not fix the problem, getting a scanner would probably be the best thing to spend money on.
 
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Old Aug 4, 2016 | 07:57 PM
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That problem can be caused by a bad sensor OR a problem in the wiring between the PCM and the sensor.
 
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Old Aug 4, 2016 | 07:58 PM
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What scanner do you recommend? I'm really looking to fix this over the weekend so hopefully it's something I can get locally
 
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Old Aug 4, 2016 | 07:59 PM
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was it OEM part


what fluid did you run
 
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Old Aug 4, 2016 | 07:59 PM
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Originally Posted by Mark Kovalsky
That problem can be caused by a bad sensor OR a problem in the wiring between the PCM and the sensor.
Thanks I'll take a look at wiring when I get home and see if I notice anything
 
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Old Aug 4, 2016 | 08:00 PM
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Originally Posted by BLADE35
was it OEM part


what fluid did you run
It was a Motorcraft part, and I use Motorcraft Mercon sp
 
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Old Aug 4, 2016 | 09:06 PM
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Like Mark said above, you better have a good look at the harness. Alot of times the sensor is fine but the harness was bad.
 
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Old Aug 4, 2016 | 10:09 PM
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Originally Posted by 87crewdually
Like Mark said above, you better have a good look at the harness. Alot of times the sensor is fine but the harness was bad.
Are you referring to the external harness, or the 2 wires inside the transmission?
 
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Old Aug 4, 2016 | 10:33 PM
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Both are in question


the sensor is also in question
 
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Old Aug 4, 2016 | 11:31 PM
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Originally Posted by usmarine1979
Are you referring to the external harness, or the 2 wires inside the transmission?
Internal. Especially if it is showing pegged hot.
 
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Old Aug 4, 2016 | 11:54 PM
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Originally Posted by 87crewdually
Internal. Especially if it is showing pegged hot.
Is bottoming out like it sees nothing.
 
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Old Aug 4, 2016 | 11:55 PM
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Originally Posted by BLADE35
Both are in question


the sensor is also in question
I'm going to wager I didn't get 2 bad sensors in a row. Buthe it does sound a bit like my luck.
 
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