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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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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 !
Speedometer
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

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

2005 Chevy Silverado show low/erratic (0-20 lbs) oil pressure.


More then likely the sending unit is faulty, but to be safe hook up a mechanical test gage at the oil pressure sender port and check oil pressure hot engine, if it is steady then replace the sending unit.

Jul 28, 2017 | Chevrolet Silverado 1500 Cars & Trucks

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
steve

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

1 Answer

ANTI-LOCK AND PARKING BRAKE LIGHT


Any code's stored in the ABS ? The VSS - vehicle speed sensor is an input to the PCM - engine computer . The PCM sends this info. on the class 2 serial data network to the instrument cluster . The Instrument cluster has a microprocessor that deciphers all relevant data , speedometer , tach , fuel level , temp. etc... an through the use of stepper motors controls the gauges . Do you know what a module serial data network is ? Do you know what computer controlled systems on a automobile are ? The ABS - anti lock brakes need speed info. also , as does the transmission for shifting point's . The parking brake light is more then just to let you know the parking brake is set . ABS problems , low fluid level in the master cylinder will also turn on this light . Having the vehicle hooked up to a professional type scanner should be the first step in the diagnostic process . Check DTC'S , view sensor data parameters .

Engine Coolant Temperature Gage
The IPC displays the engine coolant temperature as determined by the PCM. The IPC receives a class 2 message from the PCM indicating the engine coolant temperature. The engine coolant temperature gage defaults to 100°F (40°C) or below if:
• The PCM detects a malfunction in the engine coolant temperature sensor circuit.
• The IPC detects a loss of class 2 communications with the PCM.

PRNDL Display
The IPC displays the selected gear position as determined by the PCM. The IPC receives a class 2 message from the PCM indicating the gear position. The PRNDL displays blank if:
• The PCM detects a malfunction in the transmission range switch circuit.
• The IPC receives a class 2 message indicating the park position and the column park switch indicates a position other than park such as an open input.
• The IPC detects a loss of class 2 communications with the PCM.
Speedometer
The IPC displays the vehicle speed based on the information 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.

Tachometer
The IPC displays the engine speed based on the information from the PCM. The PCM converts the data from the engine speed sensor to a 2 pulses/engine revolution signal. The IPC uses the engine speed signal circuit from the PCM in order to calculate the engine speed. The tachometer defaults to 0 rpm if a malfunction in the engine speed signal circuit exists.

You could have any one of a number of different thing's causing your problem . Hooking up a scanner probably would point to the gremlin .

012 GM Class II Communications

Jan 15, 2018 | 2003 Chevrolet TrailBlazer

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