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The sending unit seldom fails in these trucks. The usual culprit is the stepper motor in the cluster itself. The stepper motors can be replaced if you can do some fine soldering and feel like pulling the gauge cluster out.

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Q: Where is the oil pressure sensor switch located on a 2004 envoy with a 4.2 liter engine It works correctly sometimes then starts going up until it goes above 80 psi?
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