O/D light flashing
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Freshman User
Joined: May 2003
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O/D light flashing
Hi everyone, got a possible problem arising with my 2000 F350 PSD. It has an automatic with 94,000 miles on it. Yesterday morning headed out to the coffee shop and the ABS light came on and stayed on the whole ride there. On the ride home it stayed off and has not come on since. I think maybe it was a fluke or a wheel sensor with some dirt on it. This morning when I pulled out of the driveway the O/D off light started flashing and the speedometer was dead. I stopped, shut the truck off and restarted it hoping it too would go away but no it kept flashing. I drove the 50 miles to work and the truck seemed to run fine, plenty of power, normal shifts, and O/D working. I shut it down again and restarted it and drove it around the lot the light stayed off and the speedo was working. I tested it a few more times and about half of the test runs the light would flash and no speedo. I'm thinking a bad speed sensor. Anyone seen this before. I dont have any way to pull codes so I'm kind of in the dark there. I doubt the two incidents are related but it seems very odd that they would happen close together like this. Does the ABS sensor double as or feed into the speedo speed sensor? Or is my tranny about to grenade? Any ideas? Thanks, Ken
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,739
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From: SE Florida
O/D light flashing
The speed sensor on top of the rear differential feeds the ABS, speedo, and transmission. When it starts to fail you get the symptoms your truck has.
A new sensor is less than $20 at the dealer. I'd change it.
A new sensor is less than $20 at the dealer. I'd change it.
Postmaster
Joined: Apr 2001
Posts: 3,628
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From: Baileyton, TN
O/D light flashing
Change the sensor before it dies completely - when that happens, at what ever speed that happens, your automatic truck will shift into second. That happened to me, when doing 75.
Theo
Theo
Postmaster
Joined: Apr 2001
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From: Baileyton, TN
O/D light flashing
Originally posted by PSDailydriver
Wow, at 75mph!!!!!!
What happened next?
Wow, at 75mph!!!!!!
What happened next?
I thought I had wrecked the truck, the engine over revved, the turbo screamed, as I did, and I threw it into neutral. The tires had left rubber as they stopped momentarily, and the truck shuddered a lot. I took it to a mechanic who changed the sensor, and checked everything out.. No apparent damage, and I got another 60K before I rebuilt the tranny.
It just scared me silly.
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
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From: Cabot, Arkansas
O/D light flashing
How much metal chips should be stuck to the old one? I was kind of surprised to see any.
You might want to pull the rear cover and see what's going on in there.By "chips" do you mean chunks of metal, like the rear end is about to frag? or did it look more like a normal break in "fuzz"?
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Freshman User
Joined: May 2003
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O/D light flashing
It was like a fuzzy covering on the sensor and a fine gritty feel to the lube. Ford replaced/rebuilt the pinion and bearings about 16-17,000 miles ago. I have had problems with the seal leaking since new and that was their last attemt to fix it.
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