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Speedometer is erratic

When at operating temperature speeometerwill read from 0- current speed. i have a tach and it is not affected

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  • dhdd May 25, 2009

    it does not have a cable. it is electronic


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  • 78 Answers

You need to replace the cable of speedometer , it is broken or became loose.

Posted on May 25, 2009

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Replaced input and output speed sensors for erratic speedometer. Now the speedometer remains at 0. Anyone have a suggestion on what else could be wrong?

input and out put speed sensors tell the TCM and the ECM the difference between engine rpms and transmission input roms so that the correct gear ratio can be selected
A speedo sensor reads the out put shaft (drive line ) shaft and refers to road speed for speed and odometer readings and to calculate the fuel consumption rate
it is possible that you have replaced the wrong sensor
Talk with an accredited transmission specialist shop and have the problem diagnosed

Aug 10, 2015 | 2003 Dodge Neon

2 Answers

Why is the speedometer reading erratically?

Depending on the type an year vehicle an the electronics on the car , the instrument cluster could be at fault ! The stepper motor that moves the speedo could be the problem if a GM product ! As far as the speed sensor goes a few other things wouldn't work very well if it were bad an the check engine light would be on more then likely because this is an input to the PCM - engine computer ! The transmission would shift erratically !
The IPC displays the vehicle speed based on the vehicle speed signal from the PCM. The PCM converts the data from the vehicle speed sensor to a 4000 pulses/mile signal. The IPC uses the vehicle speed signal circuit from the PCM in order to calculate the vehicle speed. The speedometer defaults to 0 km/h (0 mph) if a malfunction in the vehicle speed signal circuit exists.
So I would say the instrument cluster is bad !

Jun 10, 2015 | Cars & Trucks

1 Answer


I take it that you only have 1 speedometer and that reads miles per hour or car speed . The left speedo? is in reality a tachometer and reads the engine revolutions per minute. When the engine is cold (before it reaches operating temperature) the CPU will keep the rpm's above 1000 (1 x1000) and when that temperature is reached the idle speed is reduced to normal operating rpm's. So yes it is normal. All you need to do is know the difference and the meaning of all the gauges.

Oct 23, 2013 | 2001 Honda Accord

1 Answer

My speedo reading on my hyosung gt250R '11 fluctuates between 0 - 300 km/h whilst i'm riding and is clocking kilometers on the odometer much fast than it should. I've noticed whilst travelling at a decent...

Sounds to me as if you've bleed over between tach and speedo.Maybe a wire cross and touching between the two.Possibly a Faulty pickup on the speedo too.

Oct 01, 2013 | Hyosung Motorcycles

1 Answer

Engine light on running rough speedometor behaving errecticaly then speedometer pegged at 0

I had a similar issue on a Sportster, the battery cable had broken due to engine vibration, you could not see that it was broken as it had broken right at the cable end and was still making enough connection to start and run the bike, it would act erratically when riding, the tach and speedometer would either flutter or drop to 0. I didn't find it until it eventually failed completely.

Oct 20, 2010 | 2002 Harley Davidson FLHTCUI Electra Glide...

1 Answer

I have a 97 harley flhri and my speedometer only work sometimes or it goes erratic and reads the wrong speed. Tach is working fine. Any suggestions?

Your speedo head is either bad or your speedo drive cable is bad. Remove the cable and check it. If it's good, then the speedo head is going bad.

Good Luck

Aug 27, 2010 | Harley Davidson FLHR - FLHRI Road King...

1 Answer

Sometimes the speedometer reads 0 or twice as fast.

Sounds like you have a faulty transmission output speed sensor or connector problem.

Aug 15, 2009 | 2004 Buick LeSabre

4 Answers

My 1993 honda tach sputters

replace the speed tranducer, located on the gearbox

Mar 01, 2009 | 1993 Honda Accord

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