br549 Posted January 25, 2015 Share Posted January 25, 2015 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. Quote Link to comment https://www.bigmacktrucks.com/topic/38579-oil-pressure-gauge-pegged-out/ Share on other sites More sharing options...
j_martell Posted January 25, 2015 Share Posted January 25, 2015 when you key them on the oil pressure gauge pegs out and stays there? Or they peg after startup? Quote Lack of planning on your part does not constitute an emergency on my part.... Link to comment https://www.bigmacktrucks.com/topic/38579-oil-pressure-gauge-pegged-out/#findComment-275810 Share on other sites More sharing options...
Macktech689 Posted January 25, 2015 Share Posted January 25, 2015 Have seen this quite a few times, most likely the pressure sensors are faulty. Gauge will show 100, no warning light. Quote Link to comment https://www.bigmacktrucks.com/topic/38579-oil-pressure-gauge-pegged-out/#findComment-275879 Share on other sites More sharing options...
Green Dash Posted January 25, 2015 Share Posted January 25, 2015 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. Quote Jim Link to comment https://www.bigmacktrucks.com/topic/38579-oil-pressure-gauge-pegged-out/#findComment-275921 Share on other sites More sharing options...
br549 Posted January 25, 2015 Author Share Posted January 25, 2015 When you turn the key it pegged out and stays there. Quote Link to comment https://www.bigmacktrucks.com/topic/38579-oil-pressure-gauge-pegged-out/#findComment-276001 Share on other sites More sharing options...
turckster Posted January 26, 2015 Share Posted January 26, 2015 Unplug the oil psi sensor and turn the key on, gauge stays at zero-bad sensor, gauge pegs out -bad gauge. Most likely its a bad sensor, hopefully its not leaking oil and contaminating the new harness. Quote Link to comment https://www.bigmacktrucks.com/topic/38579-oil-pressure-gauge-pegged-out/#findComment-276065 Share on other sites More sharing options...
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