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Ask A. Penland Your Own Question
A. Penland
A. Penland, Ford Senior Master Technician, ASE
Category: Ford
Satisfied Customers: 6480
Experience:  ASE Master Certified, ASE Advanced Gasoline Engine Performance
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02 expedition 4x4 speedometer way fast kicks out code p 1270

Customer Question

02 expedition 4x4 speedometer way fast kicks out code p 1270 you can clear it comes right back and will shut truck off
JA: Just to clarify, what's the exact code? And have you tried to reset it?
Customer: Yes many times just barely movin spedo shows 30 have unhooked harness at transverse case the vss and still working
JA: Are you fixing your Expedition yourself? What have you tried so far?
Customer: Yes what sends signal to pcm to tale the speed
JA: Anything else you want the mechanic to know before I connect you?
Customer: No
Submitted: 3 months ago.
Category: Ford
Expert:  A. Penland replied 3 months ago.

The ABS module sends the vehicle speed signal to the PCM and the Instrument cluster. You should check the ABS system for trouble codes. There are no speed sensors on the transmission for the speedometer.

Customer: replied 3 months ago.
Scan it abs wheel speed sensors read correct speed but speedometer way fast why
Expert:  A. Penland replied 3 months ago.

The problem may be the instrument cluster itself. With the scan tool you are using for the ABS, can you read anything from the instrument cluster? If the wheel speed sensors are reading the proper speed, the instrument cluster may be reading it properly from the ABS module and not showing it properly on the speedometer.