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According to the wiring diagram this does indicate an issue with the computer or the harness connectors going to the computer. If you have lost ground to all 4 sensors this would have to be the problem.
If you have the specific codes I may be able to confirm this a little better as it looks like the grounds are for the heater circuits on the sensors. The speed sensor code is not likely the same issue however.
Sorry, the computer you were asking about. These are all grounded via the pcm on the truck.
How are you testing for ground? Each sensor has it's own individual wire for grounding the sensor. So, if you are using a meter and checking for continuity to ground and don't have any, this is correct.
Well, Best I can do without any codes is to tel you there are wires for the grounds that run to the computer on the truck. If its not getting any ground at all, it seems most likely the issue would be there then on 4 separate wires.
The ecm relay supplies power to the ecm. If you can read codes from the ecm, it's coming on.
You are very welcome, please let me know if there is any more I can do, and please remember to rate my answer.
Thanks so much.
According to my info it will have to be reprogrammed. I would contact a couple of independents to see if they have the info to reprogram it. It is likely dealer only, but it's worth a phone call.