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Speed & odemeter not working VSS is ok any ideas on cause ?

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Is maybe a fuse or a problem with the onboard computer
call your dealer and ask some time the answer those question with no charge $$ !

Posted on Apr 05, 2015


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Posted on Jan 02, 2017


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04 f150 heritage speedo moves but not over 10 mph and trans won't shift gears. i changed all sensors,traced all wires.

taking your vehicle to a qualified reair shop to have it diagnosed would be a good thing to do . You could not have traced all wires ! Because i'm sure you haven't any idea how this works . An a factory scan tool is a must to diagnose this .Do you know what ford SCP data network is ?
The instrument cluster receives the vehicle speed signal from the powertrain control module (PCM) over the standard corporate protocol (SCP) network and displays it on the speedometer gauge. If the instrument cluster receives no vehicle speed signal after one second, the speedometer defaults to 0.0 km/h (0.0 mph).

Vehicle Speed Sensor
The vehicle speed sensor (VSS) (Figure 52) is a variable reluctance or Hall-effect sensor that generates a waveform with a frequency that is proportional to the speed of the vehicle. If the vehicle is moving at a relatively low velocity, the sensor produces a signal with a low frequency. As the vehicle velocity increases, the sensor generates a signal with a higher frequency. The PCM uses the frequency signal generated by the VSS (and other inputs) to control such parameters as fuel injection, ignition control, transmission/transaxle shift scheduling and torque converter clutch scheduling.

P0500 - Vehicle Speed Sensor (VSS) Malfunction Indicates the powertrain control module (PCM) detected an error in the vehicle speed information. Vehicle speed data is received from either the vehicle speed sensor (VSS), the transfer case speed sensor (TCSS) or the anti-lock brake system (ABS) control module. If the engine RPM is above the torque converter stall speed (automatic transmission) and the engine load is high, it can be inferred that the vehicle must be moving. If there is insufficient vehicle speed data input, a malfunction is indicated and a DTC is set. On most vehicle applications the malfunction indicator lamp (MIL) is triggered when this DTC is set.
  • Open in the VSS+/VSS- harness circuit.
  • Open in the TCSS signal or the TCSS signal return harness circuit.
  • Short to GND in the VSS harness circuit.
  • Short to GND in the TCSS harness circuit.
  • Short to PWR in the VSS harness circuit.
  • Short to PWR in the TCSS harness circuit.
  • Damaged drive mechanism for VSS or TCSS.
  • Damaged VSS or TCSS.
  • Damaged wheel speed sensors.
  • Damaged wheel speed sensor harness circuits.
  • Damage in the module(s) connected to the VSC/VSS circuit.
  • Open or short in the vehicle speed circuit VSS signal between the ABS VSS signal output and the VSS signal inputs to the PCM and other modules (Excursion and F-Super Duty).
Monitor the VSS PID while driving vehicle. This DTC is set when the PCM detects a sudden loss of vehicle speed signal over a period of time. If vehicle speed data is lost, check the source of where the vehicle speed input originates from: VSS, TCSS or ABS. Note: On some MSOF applications, VSS and TCSS PID can be monitor. However if no TCSS PID is available and VSS PID is zero, TCSS circuitry frequency must be checked for loss of sensor signal. If another vehicle electronic module has generated the P0500 and the vehicle does not receive its vehicle speed input from one of the above mention sources (VSS, TCSS or ABS). Check the PCM for Output Shaft Speed Sensor (OSS) DTCs. On OSS applications the PCM uses the OSS to calculated the vehicle speed. If no OSS DTCs are found check for correct PCM configuration. Check PCM configuration for correct tire size and axle ratio. P0501 - Vehicle Speed Sensor (VSS) Range/Performance Indicates the powertrain control module (PCM) detected an error in the vehicle speed information. This DTC is set the same way as P0500, however the malfunction indicator lamp (MIL) is not triggered.
  • Refer to possible causes for P0500.
Refer to Diagnostic Aids for P0500. P0503 - Vehicle Speed Sensor (VSS) Intermittent Indicates poor or noisy VSS performance. Vehicle speed data is received from either the vehicle speed sensor (VSS), the transfer case speed sensor (TCSS), or the anti-lock brake system (ABS) control module.
  • Noisy VSS/TCSS input signal from the radio frequency interference / electro-magnetic interference (RFI/EMI) external sources, such as ignition components or the charging circuit.
  • Damaged VSS or driven gears.
  • Damaged TCSS.
  • Damaged wiring harness or connectors.
  • Malfunction in the module(s) or circuit connected to the VSS/TCSS circuit.
  • After market add-on.
Monitor the VSS PID while driving the vehicle. Check for intermittent vehicle speed indication. Verify the ignition and charging system are functioning correctly.

Mar 25, 2017 | Cars & Trucks

2 Answers

Loss speedometer and tackmoter in my 2005 jeep grand Cherokee what could it be odemeter still works

the cluster in the the car, is standalone,
its just a display and has self test you can do.

Check both cluster fuses in the fuse box yet?
one is power other is memory.

if that test passes, and you
THEN PCM, did you scan it yet? (any modern $10 scan tool works here) can-bus rated, scan tools are Ubiquious now.
not scanning the car, and missing can-bus errors is bad idea.
or missing PCM can't talk to the display(cluster) misses the boat.
or VSS errors, or any TCM errors, or other errors, DO SAY THEM.

the PCM sees RPM or the engine can't run , with dead cam or crank sensors. so right off the bat I know PCM is sending RPM .(tacho)

the speed can be checked with any scan tool made (rpm /speed)
plug in scan tool and drive, and have helper read the PID called, SPEED . (vss speed) cheap tools can do live data stream.
on ANY PID. (pids are live parameters by number)

do not guess. here, scan it first.
or go broke.

Feb 27, 2015 | 2005 Jeep Grand Cherokee

1 Answer

Odometer inop

replace the speedo or the cluster

Dec 30, 2013 | 1992 Pontiac Firebird

1 Answer

After rebuilding a transmission on 96 mercury sable, car still will down shift to low from drive. Speed odemeter quit working and cruise quit working. Any ideas

Have you tried replacing the speed sensor? Also is your car a column shift or floor shifter? If it is a column shifter make sure to inspect your linkage between the shifter and the tranny.

Feb 10, 2010 | 1996 Mercury Sable

1 Answer

What cause the O/d light blink

it's usually because you have a bad VSS, Vehicle Speed Sesnor. It sends a signal from the trans to the speedo and engine computer. Usually speedo stops working too.

Vehicle Speed Sensor (VSS) The vehicle speed sensor (VSS) (9E731) is a magnetic pickup that sends a signal to the powertrain control module (PCM) (12A650) . This VSS signal transmits vehicle speed to the powertrain control module .

Vehicle Speed Sensor (VSS)


Nov 10, 2009 | 1998 Ford Windstar

1 Answer

96 Accord VSS or Speedometer Head?

The "needle at 20MPH" is a sure-fire indicator -- it's the speedometer head. This is a common problem in this year.

I haven't found a fix other than replacing the speedometer head, sorry.

Oct 09, 2009 | 1996 Honda Accord

1 Answer

P0501 Vehicle Speed Sensor (VSS) Range/Peformance Problem, "HOW DO I TROUBLESHOOT THIS PROBLEM"

ok, replace the vss , located on the transm. case, its causes others troubleshoots likes abs,brake lights

Apr 09, 2009 | 1997 Acura CL

2 Answers

Check engine light

yes and itys a very common problem yu need to change the speed sensor (VSS) on the trans heres how it comes apart 4359d1c.gif

Feb 21, 2009 | 1997 Acura CL

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