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The speed signal is produced by the ABS module. It monitors all the wheel speed sensors and averages them to come up with a VSS reading. It then sends that signal out to all modules and components needing this reading. If the transmission shifts poorly during this issue and there is a 0500 code stored then a replacement ABS module is the fix as long as the ABS module shows incorrect VSS. If the ABS does show correct VSS then there is a concern with pin 21 gray/black wire broken or shorted. Below is a diagram.
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The test that is needing to be done on the ABS, your tool is not able to perform sense it is not able to look at all the PIDs for the ABS module. With the given information it is looking most like the ABS module faulty here.
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Thanks for the update.