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Thread: P0237 LOW POWER

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    Basic Member JuddMan's Avatar

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    P0237 LOW POWER

    2001 Cummins

    I have noticed on my quad 4k that it was reading 42 psi boost at idle. It ran great just stumbled a little bit and I was getting a check engine light with the p0237 low map sensor voltage code.

    I went ahead and replaced map sensor with a genuine Cummins one and now it reads 0 psi at all times and it acts as if the map sensor isn’t even plugged in with low power.

    I unplugged the quad and put it straight to the map sensor with the same results and same code.

    I’m getting 5v to the plug and I ohmed the ground and it checked good as well.

    Wasn’t sure what the signal wire should be, I was getting like 823.7mv.

    Not sure if that is correct or not. Pretty stumped on what to do now. Not sure if the ECM is fried, or it is possible that I got a bad map sensor?



  2. Top Of Page | #2
    Daily Grinding! RamIt's Avatar

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    Re: P0237 LOW POWER

    Sounds like you may have an electrical issue on hand more than a sensor issue.

    Can you t-tap the MAP and get a reading off it while the truck is running with a multimeter?

    2021 3500 Mega HO DRW

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