I have a 2002 4.6 l f150 xlt 4x4 today I was driving my truck car pooled wright out in front of me I had to hit the brakes really hard now the overdrive off on light is blinking what would cause that?
Thanks in advance ,Ralph

 

The od light flashing is the transmission throwing a code, you could use a programmer or a code reader to look it up. Or disconnect your battery for 10 mins drive it and see if it comes back on.

Does the truck still drive fine?

 

I don't mean to steal the thread from the OP, but I feel like this is along the same lines.
What if your OD light is always on would that be sign of the transmission throwing a code? I don't have the end cap on my gear select and always that that's what caused the issue.

 

From what I understand, the od light means od is off, aka haul mode where it won't shift to the highway gear so it won't mess up the trans. I could be way off on this, but that's my current understanding, correct me if I'm wrong.

I also think that it should reset after you shut it off and start the truck again, shouldn't it? If it is always on then treat it like a cel and get it figured out. Disconnecting the battery is just putting off the inevitable, if it threw a code, it means something is wrong, and just resetting the codes will hardly ever result in it going away.

 

Could be the range sensor

 

I had that problem with my 94 f-150 it started to blink on me i replaced the button with one from the junk yard. It stopped blinking all was good. When it was blinking i didnt notice anything different when it was blinking.
I dont know if the od button is the same on 97 to 03 as to 94

 

I had this same issue once, turned out the shift lever was halfway between overdrive and regular drive. When I adjusted the shifter and cycled the ignition, it went away.

 

i brought to the service station replaced valve body ribbon which is a electronic part inside the transmission the priced to have fixed was $438.00

 

Thanks for the update. Not too bad considering replacing the fluid is $150 itself.

Od light blinking is nearly (99%) of the time an electronic fault in the trans.

 

I was quoted $300-400 for this too, but decided to clear the code and and see if it came back first. Hasn't come back yet.