TRANS. O.D. LIGHT FLASHING AND THE VAN SHAFING FROM O.D. TO THIRD SOMETIME'S AND THE SPEEDO SOMETIME NOT WORKING RIGHT AT THE SAME TIME
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2006 Ford E-250
Answer #1DaveJHM April 08, 2011, 23:47Master
You may be in luck - the Vehicle Speed Sensor (VSS) could be faulty. If so, then the shifting and speedometer would be erratic. Have a diagnostic test performed ASAP - don't let it go too long or further issues could develop.
The O/D light could be on for many other reasons, many major issues internal to the transmission. So, let's just cross our fingers that it's this simple sensor replacement!