Update: Even more great news. The speedo quit working on me last week. I took it back in and they said the VSS was bad. I ordered a new VSS for $190, got it in today and 'oops' it still doesn't work. (I'm going to ask whether or not he took a volt meter to the VSS or just 'assumed') Turns out the speedo gear inside the transfer case is stripped out. Is this even replaceable without having to take the whole transfer case apart?
I would love to find another shop, but in our town, this is the only shop I've found in the last year within a 1.5 hour drive that will work on Isuzu's.
[edit] I re-read DTC P0502 VSS Circuit Low Input. If the tech followed this, then the stripped gear would have given him no signal. So I guess it would be plausible to assume a bad VSS.
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