Overdrive 'OFF' light blinks when in D?
Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
Hanging under the dash apron where Emissions are tested is the jack to plug in a scanner.
You would have to drive the truck again to see if the light lights or flashes again.
If yes a code would be set.
A code may still be stored from the last time.
Good luck.
You would have to drive the truck again to see if the light lights or flashes again.
If yes a code would be set.
A code may still be stored from the last time.
Good luck.
TreadLightly
Joined: Oct 2006
Posts: 1,608
Likes: 0
From: SE Missouri
I had this same problem on my V10. Ended up being a COP that was "going" out. It gave me no other indications. I suspect it was inducing AC into the circuit through the inductance of the coil, but I did not try to test it with an Oscilloscope. I bought 3 new coils and replaced three at a time till the problem was gone. Never had any issue after that.
TreadLightly
Joined: Oct 2006
Posts: 1,608
Likes: 0
From: SE Missouri
Right 
edit: That is what I thought when mine did it also. No codes came up on the transmission (from dealer). Mechanic suggested something electrical, so I checked for AC ripple and minimal signs at idle and revving it. I had read on another thread about gremlins caused by coils, so I started swapping them out until the problem was gone.
edit: That is what I thought when mine did it also. No codes came up on the transmission (from dealer). Mechanic suggested something electrical, so I checked for AC ripple and minimal signs at idle and revving it. I had read on another thread about gremlins caused by coils, so I started swapping them out until the problem was gone.
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Elder User
Joined: Apr 2012
Posts: 990
Likes: 4
From: Tamaroa, IL
I think you have to go to Ford to get the code read. I believe they have a special scanner to read transmission codes. I had it happen to my truck and it turned out to be a bad speed sensor.
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Elder User
Joined: Mar 2005
Posts: 549
Likes: 0
From: chicago burbs
this is going to sound bleak, but take it to a trans shop asap. when mine started blinking i made it another 3/4 mile before the trans was toast. no movement. had to tow it for a complete trans rebuild. this was a 2000 f150 with a 4.6 auto and around 100k miles. good luck i hope yours fares better.
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