O/D light flashing
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Senior User
Joined: Feb 2009
Posts: 391
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O/D light flashing
Hey there folks,
I have an '03 w/ the 7.3L. Today the tranny stopped shifting up out of 2nd. And the O/D light flashes.
There are no other MIL lights on.
I have do some searching here and some say the VSS (Variable Speed Sensor) is bad, some say there is a connector on the passenger side that needs cleaning, and some say there is a solenoid just inside of the tranny bottom that needs replacing.
So, what shall I do?
I have an '03 w/ the 7.3L. Today the tranny stopped shifting up out of 2nd. And the O/D light flashes.
There are no other MIL lights on.
I have do some searching here and some say the VSS (Variable Speed Sensor) is bad, some say there is a connector on the passenger side that needs cleaning, and some say there is a solenoid just inside of the tranny bottom that needs replacing.
So, what shall I do?
Lead Driver
Joined: Nov 2012
Posts: 8,304
Likes: 28
From: Salem, VA
Pick one and start in 
Choose the easiest to get to and if that doesn't fix it it must be the other and at least then you know it's in proper working order and won't become an issue down the road 
Choose the easiest to get to and if that doesn't fix it it must be the other and at least then you know it's in proper working order and won't become an issue down the road
Hotshot
Joined: Jan 2004
Posts: 19,763
Likes: 1,082
From: St Louis
You really need to start diagnosing instead of just stabbing around in the dark.
Since the O/D lamp was flashing, you have a fault that the PCM has detected. Get the scanner out and get the fault codes, then you'll have additional information upon which to build a diagnosis.
Since the O/D lamp was flashing, you have a fault that the PCM has detected. Get the scanner out and get the fault codes, then you'll have additional information upon which to build a diagnosis.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,731
Likes: 2,658
From: SE Florida
That's Vehicle Speed Sensor. And no, it's not your problem.
The codes (which I saw you posted on another site) point towards a problem with applying the direct clutch. That makes sense because the direct clutch is the one that needs to come on to shift 2-3.
Does reverse work? That also uses the direct clutch, but through a different hydraulic path. If reverse works then most likely you have a stuck shift valve in the valve body. If reverse doesn't work then the problem is most likely a failed direct clutch, or possibly a loose feed bolt under the valve body.
I just love when people say to just change parts until you find it. That only works if you have unlimited time and unlimited money. That is the WORST way to fix any problem. The only ones that do that are the ones that have NO IDEA how to fix a vehicle.
The codes (which I saw you posted on another site) point towards a problem with applying the direct clutch. That makes sense because the direct clutch is the one that needs to come on to shift 2-3.
Does reverse work? That also uses the direct clutch, but through a different hydraulic path. If reverse works then most likely you have a stuck shift valve in the valve body. If reverse doesn't work then the problem is most likely a failed direct clutch, or possibly a loose feed bolt under the valve body.
I just love when people say to just change parts until you find it. That only works if you have unlimited time and unlimited money. That is the WORST way to fix any problem. The only ones that do that are the ones that have NO IDEA how to fix a vehicle.
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Senior User
Joined: Feb 2009
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Here are the codes. Got them last evening.
P0733 Gear 3 incorrect ratio
+ Module: Transmission
P0782 2-3 Shift Malfunction
+ Module: Transmission
P0732 Gear 2 incorrect ratio
+ Module: Transmission
Yes reverse works.
And yet back yard mechanics have been fixing problems one part at a time since cars were invented. It's the American way.
P0733 Gear 3 incorrect ratio
+ Module: Transmission
P0782 2-3 Shift Malfunction
+ Module: Transmission
P0732 Gear 2 incorrect ratio
+ Module: Transmission
Yes reverse works.
And yet back yard mechanics have been fixing problems one part at a time since cars were invented. It's the American way.
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