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Q: speedo stoppedworking on 2004 Ford Expedition

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
I own a ford in australia, my problem is the speedo stopped, Ive done some tests myself an the only fault i've found is the signal coming from 1 abs sensor is a tiny bit different then the other 3. In this case the 4 ABS sensors each send a signal to the ABS module which then send a signal via CAN to the ECM. Ive pulsed my own signal to the ECM with a test tool I own just to see if the ECM is working fine which it is, I got the speedo to work using this tool. Im just curious to know if I erratic signal from a wheel sensor would cause the speedo to not work or perhaps the ABS module is faulty internally. Any help would be greatly appreciated.
Thanks.....
Troy
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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Yeah 2 codes. One is p0602 powertrain control module programming error. And p0500 speed sensor A. Missing or erratic speed signal. The first one has been there for a long time though an speedo was working when I saw that code.
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