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Neither of them are working properly. they are both sporadic in nature. the tachometer either is at 0 or it works. the speedometer just goes up and down
Both are in need of repair, nothing else will cause this kind of problem except the inner electronics of both instruments, they can be repaired by any authorized Hyundai electronics repair station, but it won't e cheap.
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This may not be of any help but I had a 94 and the speedometer kept messing up. One day my wife was in it and she was stopped at a red light and it was bouncing around 30 MPH. She took it to the dealer we bought it from. They told me it is run off electrical signal and the alternator was bad. They changed the alternator and we never had the problem again. Just a thought check your alternator see if voltage is good are bouncing around. You can check it at the battery while it is running. I have never heard of anyone else where the alternator effected the speedometer but it is what I was told and they did change the alternator.
I will say I do not remember the MPH being 0 while running.
Well I was going to say it sounds like a faulty transmission speed sensor, but the headlight circuit would not affect that. Could be a short somewhere in the harness for the instrument cluster.
2005 BUICK LESABRE TACHOMETER DOES NOT REGISTER WHEN ENGINE IS RUNNING. SOMETIMES IT BARELY MOVES, THEN GOES BACK TO 0
SAME CAR HAD SPEEDOMETER QUIT, REPLACED WITH NEW SENSOR, DROVE ABOUT 1300 MILES AND IT QUIT AGAIN. CLEANED THE SENSOR, WORKS OK NOW.
What has happened is your speedometer and tachometer drive motors are failing inside your silverado instrument cluster. I see this very often in GM trucks, to fix the problem you need to have your instrument cluster rebuilt.
Most likely a speed sensor is going bad (most cars and truck do not use mechanical speedometer cables anymore) most sensors are located near the differential in rwd cars or near the drive shaft on the transmission. Best bet is to get a Haynes manual for your car to help locate the speed sensor. Remove it and take it to the auto parts store so you can visually compare it to the replacement. Install the new speed sensor and it should restore your speedometer and odometer.
If by the bottom you mean 0 then this might not work but I had a similiar problem with my tachometer. It was starting around 4 rpm (instead of 0) and would move up and beyond 7 when I would accelerate. Found a post saying to put the car in reverse, turn the engine off and then try and start the car 3 times (in reverse). Amazingly this worked perfectly and reset the tachomoter. Might try this for your problem.
you can do what i do keep going to wrecking yard and buy one there but i will tell you the truth the speedometer is the problem it is a defect the dealer doesnt reconize this , when it stops working smach the top of it that works for me i think its a lubercation problem my self
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