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well yes but no,the speedometer signal comes from speed sensor in the transmission then goes through the ecm/pcm via the tcm (transmission control module, then on to your speedo,if the speed sensor goes bad usually the speedometer will work crazy if not at all also the instument clusters also go bad causing failure too find a new tech dude
There is a plastic helical gear in the transmission, where the speedometer cable attaches. Start there. Usually 2-3 bolts that hold it in, when it comes out, some fluid will escape. Check that gear for wear, and broken splines. Then follow the cable up to the cruise control module. Some cars route the speedometer cable to the cruise control transducer, then to the firewall to the instrument cluster. That transducer goes bad. Thats what happened on my 81 olds. The speedometer would bounce around at speeds less than 15 mph. I replaced that transducer and it is steady now.
Sounds like the cable for the speedometer needs to be replaced. If that is good then there is a problem with the gear that drives that cable where it connects to the transmission or the speedometer itself is faulty.
on rare ocasions the speedometer gauge cluster goes bad, but usually its the speed sensor. either the sensor it self or the connection either on the speed sensor or at the ecu. sometimes oil gets in and interupts in the electical connections. also make sure everything is fine in the fuse area.
I'm begining to think the problem is related to erroneous speedometer input data, ( could even be a trans speed sensor, or the speedo itself ) which falsely makes the TRACTION CONTOL SYSTEM think the drive wheels are actually SPINNING, and losing traction, causing the light to appear. Hopes this helps
OVERDRIVE ENGAGEMENT IS TIED TO THE SPEED SENSOR SIGNAL, THE SYSTEM WILL NOT GO INTO OD UNTIL THE CAR REACHES A CERTAIN SPEED, IN MOST CASES AROUND 35-40 MPH, THE SPEED SENSOR SIGNAL TELLS THE ECU WHEN THE CORRECT SPEED HAS BEEN REACHED.