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Oil Pressure gauge pegged out


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I got 2 trucks 2008 CHU & 2009 CV713 oil pressure gauge was working alright and both started showing pegged out all the time about a week apart. When you turn the key on they go all the way over and does not return. The CHU had a new engine harness put on 9 months ago. The truck show no codes. Anybody know how to go about checking it out.

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We've had several at work that have had sensors replaced. Some had the gauges pegged and others shut down because of false low pressure readings.

Maybe just a coincidence on the timing. Two of our '15's at work had sensors go about 2 weeks apart. One had around 100k miles on it and the one I drive had 89k on it.


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