Gussie, Axe is talking about the TOD light. Bad TPS info will throw a TOD code and turn on the TOD check light. TOD needs to know the correct TP to know if more torque is needed to the front. I took my TPS off to see if it needs cleaning and it didn't after nine years. No dirt issues at all there. It is a little tricky getting it back on in the right position. You'll know right away if it's not on right.
Whale, I checked and there are two sensors on the t-case for over $300 each. With $70-80 an hour labor I don't think they're hitting you too bad on the cost. However, how can they or you be sure that's the problem? It's seems odd that both would fail at the same time. A lot of these issues are caused by loose or dirty connections. A real Isuzu repair shop with an Isuzu trained tech and a Tech 2 scan tool is where you wanna take a VX. Then they would know exactly what the problem is.
I went to http://www.isuzu.com/home.jsp and put in a Dallas zip and Clay Cooley comes up as an authorized Isuzu shop! They should know what they're doing. It's the same TOD as on other Isuzu's, so they can't claim VX ignorance. Tell them to get their act together and talk to Isuzu tech assistance and find out what the heck is wrong and fix it right the first time! They should have a VX repair manual and an Isuzu Tech 2 scan tool. If they don't have that stuff then get it to the next nearest Isuzu shop with the right tools. Our last known number for Isuzu Owner Relations is 800-255-6727. Isuzu Technical Assistance for dealers is 800-533-0244. Isuzu America National Office is 562-229-5000.
That's too much money to be guessing. It's a tough call. I wish you woulda asked here before taking it in. You can get the TOD code for the problem yourself pretty easy and do some fiddling on your own, even change a part or two yourself. The shop repair manual has some good info on how to clean and inspect those sensors.
Mark
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