k9sar Posted April 17, 2019 Share Posted April 17, 2019 Noticed yesterday that my oil pressure reads maxed all the time (unless the truck is turned off). Even with the key just turned to the on position without the engine running, it flips to maximum. I know this isn't normal but my question is, for an R51, does the pressure read completely low or completely high when the key is first turned on? Can someone take notice and let me know? Deciding whether to chase a bad sensor or bad electrical. Link to comment Share on other sites More sharing options...
Mr_Reverse Posted April 21, 2019 Share Posted April 21, 2019 You have a dead short to ground in your oil pressure circuit. Most likely in the sending unit. Unplug the wire from the sensor, and if the gauge drips back to zero, then the problem is the sender. If not, then you will have to check the wire for a short to ground. 1 Link to comment Share on other sites More sharing options...
k9sar Posted April 22, 2019 Author Share Posted April 22, 2019 yep. dead sensor. RockAuto here I come. Link to comment Share on other sites More sharing options...
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