06 Granite shutting down,,

[B492bulldog]

I have an 06 Granite that will shut down, the oil pressure drops to zero,shut down light comes on ,it quits. a second or two later oil pressure comes back, it starts running again and down the road we go.Oil pressure sensor has been replaced when problem first started.Now the R in the dash is flickering also when not in reverse.Anybody dealt with this or knows what is up with it? Thank You

 

[JoeH]

I'd start with putting a mechanical oil pressure gauge in to make sure your oil pressure is in fact ok despite faulty dash.

[41chevy]

Do what Joe says then look at the simple things like  dirty grounds or corroded connectors, although the "R" flicker sounds like it could be feed back to ground to me.

[Mack Technician]

The “R” in the dash is inside a branch circuit which goes from fuse 42 to the back-up switch then splits. One split goes to the dash. One split goes to a fork-split into reverse power relay and back-up lights. Chances are a bad ground or failing bulb. These dashes are notorious for bad grounds, but usually you have a lot of stuff going wrong in the dash, not just a bulb flicker.

Oil pressure for the engine is all being calculated off a single 3 wire sensor lined into the ECM. ECM is sending that info on a J1939 CAN line to the VCU and dash. If your dash is agreeing with(simultaneous with) the shutdown you could be experiencing a sensor wire rub/break between the sensor and the ECU. You still need the manual gauge installed during a drop-out event to make certain it’s not something of a real threat to your engine. You prove it’s not a real pressure loss then have the dealer shut off your “protection shutdown” feature temporarily till you get it fixed. It’s unsafe to have unwarranted engine kills. 

 

 

And in case it's running poorly as a 2006 does...…..click on...

 

Edited June 4, 2019 by Mack Technician

[B492bulldog]

Thanks everyone for the input.. Took it back to Mack in Erie and they replaced the oil pressure sensor again, as the new one was full of oil.They also checked things out and replaced the pyro sensor also.It was sending a high exhaust temp code and making it derate sometimes.The R flickering turned out to be the ground for the dump box had broken and I did not realize the lights were flickering cause it was daylight out.All is good now, and it is running like a champ.