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Code 639...Transmission Speed Sensor.


pacodiablo

Well-Known Member
Joined
Aug 6, 2007
Messages
392
Age
37
City
Birmingham, AL
Vehicle Year
2002
1994
Transmission
Automatic
My OD off light began flashing today in my 95 Explorer. The only code it spat out was 639, which is a fault in the transmission speed sensor circuit. I did drive the truck on a muddy wet trail earlier...is it possible that messed up the sensor? Is it okay to drive the truck? What/where is this sensor and what kind of money damage am I looking at? The truck shifts fine and the fluid is good.
 
Is the TSS the same as the VSS? Speedometer works fine, but I haven't been able to find any mention of a TSS online or in Haynes.
 
Apparently some moisture got in the connection. It dried out overnight and everything is fine now. I will clean/put dielectric on all of the connectors under the truck soon though.
 

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