Transmision "check gauge" light and temperature gauge problem - Ford Powerstroke Diesel Forum
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Old 06-13-2010, 03:28 PM
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Question Transmision "check gauge" light and temperature gauge problem

Hi folks. Hopefully someone can shed some light on my most recent problem. I've an '03 F350 Super Duty with the 6.0 liter engine. Yesterday, I was coming down a hill and applied the tow/haul button to slow me down, although I wasn't hauling anything. When I got on the flat, I forgot to turn off the tow/haul button, and the transmission "Check Gauge" light came on and the transmission temperature gauge shot to extreme hot, and the tow/haul light was blinking on and off. It wouldn't stop blinking when I pressed it. After letting the truck sit overnight, this morning all was fine when I drove it for awhile. After a number of stops around town, the same thing happened, and I noticed that the transmission shifting wasn't quite as smooth as it should be, as there was a bit of a jerk when it shifted. I checked the transmission fluid level, and it is slightly below full when hot. I'll top it up tomorrow. Any ideas why this is happening? Faulty sensor perhaps? Thanks for your suggestions.
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Old 06-14-2010, 07:17 PM
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Probably the trans temperature sensor. Its about 40 bucks from the dealership and you will have to drop the pan to replace it. Remember to grab a case of Mercon SP fluid and a filter while you are there!
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Old 06-14-2010, 08:49 PM
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Thanks for the reply. Yeah, I kinda figured it was probably that after doing some research on the internet. I had the transmission oil and filter changed about 10,000 miles /15,000 km's ago, so it should still be good. I know it would be better to outright replace them again, but with such little use, would it be worth the cost? Those filters and the Mercon SP up here in Canada are pretty expensive.

Also, I've read that Ford put out a notice last year on the Torqshift trannie oil. Apparently, Ford has stated that you can now use Mercon LV as well as Mercon SP in the Torqshift trannie (is it the same as the 5R110 model??). Only trannies 6HP26, 6R60, and 6R75 are to continue with Mercon SP only. Do you or anyone else know about this? Is the LV any less expensive and more readily available than the SP???

Thanks.
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Old 06-15-2010, 02:57 AM
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+1 TFT Sensor
Quote:
Originally Posted by TwistedSS View Post
Probably the trans temperature sensor. Its about 40 bucks from the dealership and you will have to drop the pan to replace it. Remember to grab a case of Mercon SP fluid and a filter while you are there!
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Old 06-15-2010, 03:40 PM
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What's the TFT stand for? Transmission......what? Thanks.
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Old 06-16-2010, 02:38 AM
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Transmission Fluid Temperature
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