1999 Ford F-250 Speedometer Dead Until 30

FORD F-250
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DOUGMULL
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  • 1 POST
99 Ford F250 Superduty Diesel

Speedometer does not work until I reach 30 mph. I assume this is the vehicle speed sensor, but need help locating where this is at and where I would check it without going to the dealer. It is not shown in my car repair book.

Many thanks.
Apr 2, 2006 at 1:19 AM
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LOSONE
  • ✓Experienced Mechanic
  • 1,616 POSTS
The VSS is almost bullet proof and if it wasn't working until 30 it would set a check engine light as tranny shift depends on it's input. I suspect you need a new speedometer cluster. It is a common Ford failure. It is located on the rear of the tranny. Good Luck let me know
Apr 2, 2006 at 1:24 AM
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Suggested Repair

Replace the speedometer cluster, a common Ford failure. A faulty vehicle speed sensor is unlikely without a check engine light, because transmission shifting depends on that signal. The VSS is on the rear of the transmission if it is still checked.

Conversation Summary

The owner of a 1999 Ford F-250 Super Duty diesel says the speedometer does not work until about 30 mph and asks where the vehicle speed sensor is located. The expert says the VSS is generally reliable and a fault would usually set a check engine light because transmission shifting uses its signal. The expert suspects a failed speedometer cluster and notes that the VSS is on the rear of the transmission.

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