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Speedometer works sometimes. Sometimes goes below zero. Odometer is digital and works fine. I changed the speed control sensor. What do I check first and last?

Buick lesabre custom 2004. Did they have issues with these? It does have over 215000 miles on it. Still runs and looks great.

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If you're sure all the electrics/connectors/wiring/fuses etc are fine.
then your issue is the transmission.

Posted on Apr 25, 2017

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Transmission speed sensor


You could have a faulty speedometer/odometer combination meter causing a false Vehicle Speed Sensor error.
My 1998 Sienna had the following symptoms:
- Speedometer and odometer failed intermittently
- The check engine light would come on and I would get a p0500 code in the OBDII.
- The cruise control would stop working at the same time the speedometer failed.
There is a speed sensor in each one of the tires and they feed the speed information to the ABS ECU. From the ABS ECU the speed signal goes to the speedometer/odometer combination meter, and from there it goes to the Engine Control Module and to the Cruise Control ECU. I could see a signal coming into the speedometer/odometer, but no signal going out. Replacing the speedometer/odometer combination meter fixed the problem.

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My 2003 ford focus speedometer stops working sometimes as does the elecyric odometer- sometimes both at same time. Other gauges work fine. The odometer goes to just dashes in place of the actual mileage...


Usually if both the odometer and speedometer stop working, the problem is the speed sensor on the transmission. You should also have a trouble code in the engine computer.
If one component works but the other does not, the problem is usually the speedometer head in the dash.

Sep 23, 2013 | Cars & Trucks

1 Answer

ABS and TC light on. Speedometer and odometer are not working


If the speedo and odometer are not working it could be the speed sensor in the transmission. And the speed sensor could also knock out the ABS and traction control systems.
Have you had the body computer scanned for trouble codes ?

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My Camry speedometer is intermittent


speed sensor could be going bad

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98 Honda Accord odometer, speedometer and cruise control all died


check the fuse for the gauges and if not check speed sensor

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Car speedo & odometer sometimes work OK, other times not at all.


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.

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1991 S-10 Blazer speedometer, odometer not working, all other instruments work, cruise control also works.


Speed sensor has failed.

It is basically a magnet sensor that reads the RPMs of the tranny.

It is screwed into the side of the transmission.

Do you have an aftermarket alarm installed, or remote start?
Sometimes those wires can be damaged if not installed properly.

It is $33.00 at autozone.
Part #SU1090
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Jul 09, 2009 | 1991 Chevrolet S-10 Blazer

1 Answer

My speedometer and odometer go on and off in my 94 accord


Try to check the speed sensor because if there is a problem with the speed sensor you will encounter this issue.

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