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DTC codes - P0251 oil pressure rationality


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Can someone explain to me what P0521- Engine oil pressure sensor performance, means in english? As I was leaving work today My check gauges light came on and I had no oil pressure according to the gauge. I pulled over as fast as I could and shut the truck off, after restarting it I had normal oil pressure again, and it was fine the entire way home.

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Monitor & Set Conditions

Oil pressure rationality is monitored with ignition on and engine off. DTC may set if oil pressure is seen with no RPM signal for 30 seconds.

 

http://articles.mopar1973man.com/2nd-generation-24v-dodge-cummins/59-obdii-error-codes/192-p0521-oil-pressure-rationality

 

In other words its impossible to have oil pressure if the engine isn't twisting.

 

Time for a oil pressure sender.

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Matt, that is a common problem. They are more of an on/off switch than a pressure sender. The sender takes a 1 1/16" extra deep six point socket to change it. Real simple to change too. I have a socket that I made to change them, but I may be gone for the weekeknd. I don't know for certain yet.

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I use a set of 6 double sided "Water heater element" style sockets for all sensors. They are cheap & will fit most sensors. You can get them at HD/ Lowes, hardware store or Harbor freight/Northern Hydraulic.

 

Ed

I never thought of that! That would be the best way to go, but I happen to have a couple of old sockets that I could cut and weld together for a socket.

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