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Speedometer still moves but inaccurate.

Speedometer still moves depending on speed but is saying that 55-60 is zero instead of zero. how do i fix this?

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1 Answer

Speedometer needle wacky


I wouldn't imagine so. Unless it is from a different transmission, different gear ratios will tell the computer to display an inaccurate speed.

Nov 30, 2015 | 2005 Ford Focus ZX4

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

It is a 4x4 and I cant find the speed sensor that operates the speedometer. The speedometer sticks at 100mph at a dead stop. It also jumps around between 75 and 80 at random when I am only doing 45 mph.


On our Lincoln, the problem was the Alternator shorting and energizing the ground circuit with Positive juice. Our speedometer and odometer were both affected.

We had miles advancing and 45-50 MPH at a stop. Then inaccurate readings while the car was moving.

Car-stuff.com seems to have the best price for the actual speed sensor which is located in the differential @$11.94.

Please rate my solution and I hope I was helpful.

Nov 07, 2012 | 2001 Lincoln Navigator

2 Answers

To determine if speed sensor or cluster panel is problem of speedometer not working properly,2004 chev impla


if you have a multimeter and can jack up the drive wheels, run these tests on the sensor:

A defective vehicle speed sensor may cause different problems depending on the computer output control functions. A defective vehicle speed sensor (VSS) may cause improper converter clutch lockup, improper cruise control operation, and inaccurate speedometer operation.
  • Prior to VSS diagnosis, the vehicle should be lifted on a hoist so the drive wheels are free to rotate.
  • Backprobe the vss output wire and connect the voltmeter leads from this wire to ground.
  • Select the 20-volt AC scale on the voltmeter.
  • Then start the engine.
  • Place the transaxle in drive and allow the drive wheels to rotate. If the VSS voltage signal is not 0.5 volt, or more, replace the sensor.
  • When the VSS provides the specified voltage signal, backprobe the VSS terminal at the PCM and repeat the voltage signal test with the drive wheels rotating.
  • If 0.5 volt is available at this terminal, the trouble may be in the PCM (powertrain control module).
  • When 0.5 volt is not available at this terminal, turn the ignition switch off and disconnect the wire from the VSS to the PCM.
  • Connect the ohmmeter leads across the wire. the meter should read zero ohm.
  • Repeat the test with the ohmmeter leads connected to the VSS ground terminal and the PCM ground terminal.
  • This wire should also have zero ohm resistance. If the resistance in these wires is more than specified, repair the wires.
  • The condition of a speed sensor can be checked by going through the diagnostic routines for the system.
  • If this test indicates that a sensor is faulty, the sensor should be replaced.
  • Speed sensors can also be checked with an ohmmeter. Most manufacturers list a resistance specification.
  • The resistance of the sensor is measured across the sensor's terminals.
  • The typical range for a good sensor is 800 to 1400 ohms of resistance.

Dec 23, 2010 | 2004 Chevrolet Impala

1 Answer

When driving the car the speedomator goes to 0 and then the tranmission starts slipping


There's a possible worn out clutch inside of the auto transmission. The speedometer going to zero could be the transmission not sensing speed, and then disengaging the transmission to keep the car from stalling at a stop sign, maybe.

Try looking at the VSS (vehicle speed sensor) circuit on the transmission.

Here are some tests that can be performed on the VSS:

A speed sensor. Courtesy of General Motors Corporation, Service Technology Group.
A defective vehicle speed sensor may cause different problems depending on the computer output control functions. A defective vehicle speed sensor (VSS) may cause improper converter clutch lockup, improper cruise control operation, and inaccurate speedometer operation.
  • Prior to VSS diagnosis, the vehicle should be lifted on a hoist so the drive wheels are free to rotate.
  • Backprobe the vss output wire and connect the voltmeter leads from this wire to ground.
  • Select the 20-volt AC scale on the voltmeter.
  • Then start the engine.
  • Place the transaxle in drive and allow the drive wheels to rotate. If the VSS voltage signal is not 0.5 volt, or more, replace the sensor.
  • When the VSS provides the specified voltage signal, backprobe the VSS terminal at the PCM and repeat the voltage signal test with the drive wheels rotating.
  • If 0.5 volt is available at this terminal, the trouble may be in the PCM (powertrain control module).
  • When 0.5 volt is not available at this terminal, turn the ignition switch off and disconnect the wire from the VSS to the PCM.
  • Connect the ohmmeter leads across the wire. the meter should read zero ohm.
  • Repeat the test with the ohmmeter leads connected to the VSS ground terminal and the PCM ground terminal.
  • This wire should also have zero ohm resistance. If the resistance in these wires is more than specified, repair the wires.
  • The condition of a speed sensor can be checked by going through the diagnostic routines for the system.
  • If this test indicates that a sensor is faulty, the sensor should be replaced.
  • Speed sensors can also be checked with an ohmmeter. Most manufacturers list a resistance specification.
  • The resistance of the sensor is measured across the sensor's terminals.
  • The typical range for a good sensor is 800 to 1400 ohms of resistance.

Nov 01, 2010 | 1997 Mercury Sable

1 Answer

My speedometer seems to be giving me the wrong speed when i'm on the highway. It would say i'm doing 90mph while i would be doing 65 mph. How can i fix this ??


What is most likely happening is that the tiny electric servo motor which is what actually moves the speedometer needle is going bad. I've seen several where the speedometer or tachometer become erratic, inaccurate, or stick in place. If this is the case then the dash assembly has to come out and be repaired. There are several companies that can do this but I usually send ours to a GM dealer and have them send it out to get fixed. Usually they replace all the servos for all the instruments and I haven't seen one fail again after being repaired.

Jun 11, 2010 | 2003 GMC Envoy

2 Answers

2005 Silverado 1500HD Speedometer not displaying correct speed


Pretty common problem with these. Here's a guide to learn how to fix GM instrument clusters yourself, I used it to fix mine and it worked great.How to guide for Silverado instrument cluster repair

Dec 16, 2009 | 2005 Chevrolet Silverado 1500HD

1 Answer

Speedometer in car doesn't move during driving


what year is it and what model is it

Aug 26, 2009 | 2003 Honda Civic

1 Answer

1999 Saturn SL 5-speed. The speedometer extremely inaccurate.


could be , probably is the speedometer cable, should be fairly cheap repair

Aug 04, 2009 | 1999 Saturn SL

1 Answer

Transmission speedometer problem


This all can be caused by a defective Vehicle Speed sensor, also called a VSS, also run a test on the computer to see if any codes are in memory that will help to sort this problem out.

Nov 08, 2008 | 1994 Pontiac Grand Am

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