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Posted on May 01, 2011
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97 Ford Thunderbird, 8 cyl, 4.6, 78000 miles. Green od light blinking, code p0500. Shifts fine, speedometer working. Replaced vehicle speed sensor (motorcraft 9e731) and trans speed sensor (motorcraft 7h103). transmission fluid and filter replaced 10,000 miles ago. Cleared code. Flashing od and p0500 returned on first test drive within 1 mile.

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  • paulas_13 May 01, 2011

    everything looked ok and the sensor has been replaced as stated in the original information.

  • paulas_13 May 01, 2011

    The advice I received is exactly what I found the first time I googled p0500, the expert just copy and pasted it. I have done everything listed in his response, the last line stating "if everything looks ok replace sensor". The sensor has been replaced, that is the problem, the p0500 code came back immediatly. Please read original question for details.

  • paulas_13 May 01, 2011

    Sorry I did not see your response about the pcm. We have not done anything with the pcm. thanks

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  • Master 8,197 Answers
  • Posted on May 01, 2011
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A code P0500 may mean that one or more of the following has happened:

  • The Vehicle Speed Sensor (VSS) is not reading (functioning) properly
  • There is a broken/frayed wire leading to the vehicle speed sensor
  • The vehicle's PCM is not correctly configured for the actual tire size on the vehicle
Possible Solutions

The simplest thing to do is to reset the code and see if it comes back.

Next, check all wiring and connectors that lead to the speed sensor. The location of the sensor depends on your vehicle. The sensor could be on the rear axle, transmission, or perhaps the wheel hub (brake) assembly.

If the wiring and connectors are OK, then check the voltage at the speed sensor. Again, the exact procedure wil depend on your make and model of vehicle.

If everything looks OK, replace the sensor.

  • Anonymous May 01, 2011

    If you have replaced the sencers that means the pcm is not getting the signal. You will need to have the pcm looked at or replaced.

  • Anonymous May 01, 2011

    Sorry you did not say that you changed the PCM/main computer for the car. You only said you replaced the sensors. Please get it right befor you come to FixYa and bad mouth us experts. Did you have the PCM looked at and tested then.

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According to http://repairpal.com/OBD-II-Code-P0500:

Vehicle Speed Sensor Malfunction
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Output Shaft Speed Sensor (OSS) 7H103: The output shaft speed (OSS) sensor is a magnetic pickup, located at the output shaft ring gear that sends a signal to the powertrain control module to indicate transmission output shaft speed. The powertrain control module uses this signal for torque converter clutch control, shift scheduling, used in determining EPC pressure. Symptoms: No converter engagements, harsh shifts, abnormal shift schedules. DTC: P0720, P0721 std~us~en~file=d14110a.gif~gen~ref.gif


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