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Speedometer quit working then started bouncing and truck is cutting in and out now what would cause this
Had truck serviced, speedometer did not work afterwards. couple hundred miles later it started bouncing from 0 - 80, then after another 150 miles truck started cutting in and out
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Right off the bat it sounds like a broken speedometer cable. As the cable spins from the gearing of the transmission it is clicking against the broken part of the cable running to the speedometer gauge. The frictional clicking is what's causing your needle to bounce around. Since the cable is probably broken and cannot spin long enough to move the odometer numbers. Raise your vehicle safely and disconnect the speedometer from the transmission. then see if you can pull the cable out of the housing. If only a portion of the cable comes out, then that should answer your question. Be careful when you disconnect the speedometer cable from the transmission as not to lose any small pieces that cause the drive mechanism to work.
If the unit is bouncing quite eratically, this is an indication of a gear/motor issue in the speedometer itself. There are places that repair these but are few and far between. Check out Silverstar Porsche/Mercedes auto recycling in CA. Great service and resonable on prices and will ship. Replace the speedometer.
when the sensor was installed it was installed wrong.
They wired it into the turn signal feed.
have your dealer or, an auto electrician fix the wiring to your sensor.
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