Keoweekat Report post Posted September 22, 2019 I have a 1999 H.R. Navigator with a ISC 8.3 ,350 Cummins. I went out to start it to drive it some and when I turned the switch on the STOP and WARNING light came on and went off then the WARNING light came back on before I cranked the engine. I started the engine every thing looked normal ( Pressures and Temps ) I drove it about 15 miles then stopped and had some one read the codes. it said there was no oil pressure but idle cold was 75 PSI, running warm 38 PSI, and driving around 43 PSI. So with this said does this engine have 2 oil pressure sensors one for the ECM and one for the gauge cluster or do they share one sensor? Share this post Link to post Share on other sites
jleamont Report post Posted September 22, 2019 I am pretty sure you have two oil pressure sensors. One for the gauge and one for the ECM. Call Cummins with your engine serial number. They can pinpoint where it’s located. I’d check the connections first, brief wire inspection for chaffing, if looks good change the sensor. I don’t remember them being expensive. 1-800-Cummins. Share this post Link to post Share on other sites
Keoweekat Report post Posted September 23, 2019 Thanks for the reply, I will be checking with cummins this morning. Share this post Link to post Share on other sites
jleamont Report post Posted September 23, 2019 Let us know how you make out. Share this post Link to post Share on other sites
