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Dan, ASE Certified Technician
Category: Ford
Satisfied Customers: 1693
Experience:  Auto Technician
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I have a 2000 Ford F-250 7.3 4x4 and I am getting the codes

Customer Question

Hello, I have a 2000 Ford F-250 7.3 4x4 and I am getting the codes p0720 and p0503. The overdrive light starts flashing when I come to a stop and truck trying to stall. What could it be?
Submitted: 1 year ago.
Category: Ford
Expert:  Dan replied 1 year ago.

Sounds like you have a bad output speed sensor. A scan tool that can read live data on the transmission would verify this. Replace the output speed sensor and your problem should go away.

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Thank you so much!

Customer: replied 1 year ago.
I have already replace that and nothing changed
Expert:  Dan replied 1 year ago.

You need a scan tool to see live data of the trans, then you can see output speed in real time. That would rule out the wiring harness. You could also have a mechanical problem in the trans itself.

Customer: replied 1 year ago.
Scanned it and everything checked out with the sensor
Expert:  Dan replied 1 year ago.

You have an intermittent problem in the wiring harness.