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How can I get my speedometer to read true speed?

A friend of mine was in my car and started pressing buttons in my car and now when I drive my speedometer does not give the true speed I am driving

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Is your dash digital or analog

Posted on Apr 26, 2017

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My speedometer goes up and down , and my radio goes on and off


The speedometer can fluctuate rapidly under normal driving conditions when the car's speed changes abruptly, but sometimes the needle can start swinging around the dial without any fluctuation in speed. If the hairspring comes loose or breaks, it can't hold the speed cup in place, and the result is a fluctuation in the dial. In electrical speedometers, if the circuit that counts the magnetic pulses fails, it can cause the speedometer read-out to vary from the actual speed and to shoot upward or downward without notice. If a speed sensor in the automatic transmission starts to malfunction, it can affect the speedometer and cause fluctuations. In these instances, either the speedometer or the sensor needs replacement.

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Speedometer stop working where's the cable?


Your vehicle does not have a traditional speedometer cable. Instead it uses a VSS (Vehicle Speed Sensor) to read speed of the vehicle below is a short test to help you determine if it is the VSS that has failed.

SPEEDOMETER VEHICLE SPEED SENSOR TEST

1. Press and release trip odometer button until function number 6 appears in display window.

2. Turn a front wheel and observe display (pulses are added to number in display. Check impulse signal for speedometer vehicle speed sensor. If 7 pulses are generated per wheel revolution, vehicle speed sensor is okay.

3. If specified number of pulses are not generated, check for open in wiring harness between speed sensor and instrument cluster. Repair wiring harness if necessary. If wiring harness is okay, replace speedometer vehicle speed sensor.

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Change the Engine speed sensor. This can sometime cause your dash to do all sorts of weird things when they fail, such as setting the low fuel warning off as well. strange but true ! good luck

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Why does my 03 yukon xl speedometer gradually flats to 0 while driving. it does not stall. it does it at least 1 a month specially in long trips or high speeds. when i arrive to destination it cools off...


It is probable that the cable for the speedometer is streached and your MPH reading is incorrect all or most of the time, get a friend to drive behind you at say 55 MPH so you will know the odometer reading ( may prevent speeding ticket )
All metal expands when heated and contracts as it cools. Your cable becomes slack when hot. Stay Safe!

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Which Sensor Is IT??


go to a junk yard, they are way cheaper and the chances of them going bad are very slim..

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There is a way, have a friend drive at 30 mph and raise there hand at that speed, you follow them and make a note of the RPM, from there is is simple math to figure out the other speeds and RPM reading.

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