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Ford e350 speedometer issues

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Old Today | 07:30 AM
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Sandicaine's Avatar
Sandicaine
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Ford e350 speedometer issues
I have a ford e350 chassis with Gulf Stream bt cruiser. Speedometer sits dead still until I reach approx 35 mph then speed jumps right to 75 mph. Any suggestions where to look. Scanned with forscan and no codes.
 
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Old Today | 08:57 AM
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Don Ridley's Avatar
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Use Forscan to read the speed PIDs. Verify the PIDs jump like the speedometer. If they do, then VSS or wiring may be bad. Otherwise it's the instrument cluster. Junkyard ICs are cheap and readily available.
 
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