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Old 04-26-2013, 19:55   #1 (permalink)
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OD light flashing

Ok so I have a 2005 Ford Crown Victoria, I use it to tow my small travel trailer. While pulling today the temperature was approx 200 degrees according to a B&M Trans temp gauge (sending unit is in the pan). All of a sudden the OD off light started to flash, I always tow in Drive and never use OD. Then a couple times at 55mph it almost felt like the torque converter unlocked and then locked again. Trans has always been in great shape with regular fluid and filter changes with quality ATF. Never seen the light flash before and it has never shifted funny, always towed great. I checked for codes in the OBDll port and found nothing, after I shut the car off and restarted it the light went out. I checked the fluid and it is at the correct level and clean. Any suggestions? Thanks.
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Old 04-27-2013, 07:35   #2 (permalink)
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Re: OD light flashing

Does your scanner check trans codes? It could be that sensor thought it got hot or another problem developed.
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Old 04-27-2013, 09:05   #3 (permalink)
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Re: OD light flashing

Any idea what temperature would trip the light and make it blink if that was the problem? Maybe my gauge is not accurate.
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Old 04-27-2013, 14:16   #4 (permalink)
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Re: OD light flashing

I'm not sure of the temp setting but here's some info on the life of a transmission at different temperature. Transmission Oil
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Old 04-29-2013, 03:51   #5 (permalink)
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Re: OD light flashing

If the overdrive light is blinking, do not simply keep driving. While transmission are complex devices best left to professionals, you can make check a few basic things yourself. Check the transmission fluid to make sure it is not low or empty. There will be a transmission dipstick in the engine bay. The fluid should be red and at the full line on the dipstick. If the fluid is low, or if it is dark and emits a burning smell, the transmission fluid is bad and may be the explanation for transmission failure. Take your vehicle to the dealership or an independent shop to have the transmission codes read and diagnosed. Once the shop reads the codes, they will be able to diagnose the problem.
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Old 04-29-2013, 06:42   #6 (permalink)
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Re: OD light flashing

Jeff's advice is correct, but if you are not familiar with your vehicle's service requirements, check the owner's manual. When checking transmission fluid level, the trans should be in neutral, the fluid should be warm, and the engine should be running. Do not overfill your transmission.
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Old 04-29-2013, 07:50   #7 (permalink)
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Re: OD light flashing

Thanks guys I checked fluid properly and it is good, my car says park though not neutral on the dipstick.
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Old 04-29-2013, 15:00   #8 (permalink)
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Re: OD light flashing

It's the same thing. I use park. Some Chrysler products say neutral not Ford or GM.
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Old 04-29-2013, 22:04   #9 (permalink)
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Re: OD light flashing

According to the Ford CD the normal range for trans fluid in a 2003 CV is 150-170 F. Don't know about the 2005.
You should run a scan ASAP and correct now. There are many things that can trip a code, some not in the trans. Might want to take it to a small shop with a good rep. The Diagnosis instructs on the CD are 45 pages long and require a number of specialized test devices.
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