Question about 1999 Chevrolet Silverado 1500

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Speedometer going 100mph but truck is actualy going on40mph

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Change the speedometer it is faulty

Posted on Nov 13, 2009

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Hi, this is a pretty common problem on these Silverado instrument clusters. We can repair it for you or provide you with the parts to do it yourself. Click here to learn more about these Silverado instrument cluster problems: Dr Speedometer Instrument Cluster Repair Speedometer Repair Guage...

Posted on Nov 11, 2014

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Hi,
Speedometer will always read faster than your actual speed, but your odometer will read true mileage.
have sat nav into your car to be more sure about your real speed.Measuring error depends on many obstacles, such as, tyres (put lower profile, and here you go, speed is higher than in reality and vice versa).
On official reviews they say that there is approx 5% difference between real speed and actual where actual is lower.
But for your peace of mind, for other manufacturers, difference tends to be higher.
If you have climatronic, push the fan speed down, blue temp, and ECON buttons at the same time. Then use the red temp button to go to channel 16. That is the vehicle speed. You will notice it is considerably lower than the speedometer.
the odos are nearly always correct. All this is measured with both Garmin GPS and several speedo checks along the roads.
It is not bad engeenering, it`s made on purpose, because what the law says, and it should also apply when you changes tires to another approved dimention
Thanks for contacting fixya.com

Posted on Nov 13, 2009

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One of two things is wrong.
1) vehicle speed sensor is bad, or
2) Speedometer head is bad (speedometer it self)

If you have no check engine light on, chances are its the speedometer.

Posted on Nov 13, 2009

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Posted on Jan 02, 2017

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Many of the problems I encounter have been speedo's showing a faster speed than actual, 100mph plus.

Good Luck
Dave

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