Will flashing OD light set a computer code?
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Elder User
Joined: Aug 2001
Posts: 942
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From: South Texas
Will flashing OD light set a computer code?
99 F150 4.6 auto 175K miles.
Last couple of days, getting an occasional flashing Over Drive light. It seems to reset each time engine is shut off. No other apparent shifting issues. Fluid level is OK.
I cannot see any codes stored in the ECU. I could force it to come on at will with a hard acceleration across the 1-2 upshift point.
I know it is ready for a fluid change again, slight discoloration. Fluid and filter changed last at 100K.
Any ideas?
Last couple of days, getting an occasional flashing Over Drive light. It seems to reset each time engine is shut off. No other apparent shifting issues. Fluid level is OK.
I cannot see any codes stored in the ECU. I could force it to come on at will with a hard acceleration across the 1-2 upshift point.
I know it is ready for a fluid change again, slight discoloration. Fluid and filter changed last at 100K.
Any ideas?
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Joined: Jan 2004
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From: St Louis
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Fleet Owner
Joined: Jan 2008
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From: southern md
on my 95 it sent a code but it was a generic code took many tests to determine what the problem was-I finally got it figured out 
was my shift pack
yours could be a much different problem depends on what ya find doing the tests
was my shift packyours could be a much different problem depends on what ya find doing the tests
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Joined: Jul 2008
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From: Vermont
My OD light has been flashing lately too. I've never changed the fluid, so I know it's time to (76,000 mi.) but I haven't been able to find any info on how to do it. I assume the torque converter also needs to be emptied? If so, how do you empty that? Is there a tutorial on this?
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Elder User
Joined: Aug 2001
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From: South Texas
There isn't a drain plug on the TC so only way to get it all is to take it somewhere they have a machine to exchange the fluid.
Generally they tap into the upper cooling line at the radiator, start the engine, drain the old into a reservoir on the machine, and pump in the new at the same time.
If you decide to go this route, I suggest adding a pint/quart of Trans-X about a week before the exchange. The Trans-x will remove the varnish residues and condition the seals. Drive it for the week with the Trans-X in the system, then do the exchange. This is some good stuff and I have been using it on balky transmissions for nearly 30 years.
Be aware it has some Benzene in it, so keep it off painted surfaces and wash your hands good after handeling it.
Generally they tap into the upper cooling line at the radiator, start the engine, drain the old into a reservoir on the machine, and pump in the new at the same time.
If you decide to go this route, I suggest adding a pint/quart of Trans-X about a week before the exchange. The Trans-x will remove the varnish residues and condition the seals. Drive it for the week with the Trans-X in the system, then do the exchange. This is some good stuff and I have been using it on balky transmissions for nearly 30 years.
Be aware it has some Benzene in it, so keep it off painted surfaces and wash your hands good after handeling it.
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