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2001 f350 speedometer intermittent loosing signal, abs light…

Customer Question
2001 f350 speedometer intermittent...

2001 f350 speedometer intermittent loosing signal, abs light comes on...replaced vss, no change... monitor vss on modus.. vss signal drops to 0 occasionally. Reads 1 MPH when stopped

Mechanic's Assistant: Thanks. Can you give me any more details about your issue?

Speedometer intermittent bounces zero to traveling speed

Submitted: 2 years ago.Category: Ford
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Answered in 15 minutes by:
2/22/2016
Ford Mechanic: James, Ford Technician replied 2 years ago
James
James, Ford Technician
Category: Ford
Satisfied Customers: 3,634
Experience: Ford Senior Master Tech, Ford gas and diesel expert, ASE Certified
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Hello, when the VSS signal is working does the speedometer continue to work?

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Customer reply replied 2 years ago
acts up when abs light is illuminated
Ford Mechanic: James, Ford Technician replied 2 years ago

Have you replaced the pigtail to the rear abs sensor. That is where I would begin. The wire harness pigtail gets pretty beat up from the rocks and can creat intermittent signals.

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Customer reply replied 2 years ago
Replaced pigtail and vss, replaced abs computer. ..no change.. after further investigation. ... speedometer works good when accelerating or holding steady speed... vss signal drops to 0 when vehicle is slowing. Also swapped a known good cluster, could tone ring in rear differential be shifting when de accelerating
Ford Mechanic: James, Ford Technician replied 2 years ago

It possible. The tone rings can warp from Time to time. They are pressed on but I have seen them damaged.

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