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James, Ford Technician
Category: Ford
Satisfied Customers: 3632
Experience:  Ford Senior Master Tech, Ford gas and diesel expert, ASE Certified
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2001 f350 speedometer intermittent loosing signal, abs light

Customer Question

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
JA: Thanks. Can you give me any more details about your issue?
Customer: Speedometer intermittent bounces zero to traveling speed
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Submitted: 1 year ago.
Category: Ford
Expert:  James replied 1 year ago.

Hello, when the VSS signal is working does the speedometer continue to work?

Customer: replied 1 year ago.
acts up when abs light is illuminated
Expert:  James replied 1 year 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.

Customer: replied 1 year ago.
Replaced pigtail and vss, replaced abs computer. 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
Expert:  James replied 1 year ago.

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