2011 isx435 problem

[JimT]

(01-14-2020 )aalendar Wrote:  Hi, first of all, great community here.
I own 2011 prostar with isx 435 and two days ago my truck get the warn engine light and shuts off while idling,
Drove it to mechanic 70 miles and then got red shut down engine light. The mechanic pulled off codes, reset the computer and that seemed to help, I was on the way to delivery. Next two mornings when I start the truck, I have again warn engine light on and then after 30 minutes or engine warms up light cleared up. Currently in Phoenix Area looking for a mechanic.
Probobly is best to change exhaust gas pressure sensor and camshaft position sensor and if that not fixes the problem look into wiring problem.
Codes that were in the computer prior to erase were:

187 Circuit 2 for the sensor power supply. Value too low ( short to ground, low voltage )
2554 Exhaust gas pressure sensor. Intermittent or incorrect data
2374 Exhaust gas pressure sensor fault. Insufficient voltage.
778 Camshaft position sensor. Intermittent or incorrect data.
115 Camshaft signal missing. Crankshaft signal missing. Intermittent or incorrect.

At the time of deletion, all faults were inactive.
Any thoughts? Do I first try to change sensors or something else is in the play?
Thanks

First thing that jumps out at me are codes 187 and 2374. Both mention low voltage. Since you are getting multiple sensor issues I'd be looking for a common cause. Start at batteries, check all wires and connections. Check all ground connections. Look around for bare, rubbing or damaged wires. Check all your fuses for corrosion. Check the sensors for internal shorts. Test your batteries and alternator. Not necessarily exactly in that order, but that's what comes to mind.

Not sure which engine that would be, but if it's the cm2250 than those sensors are connected to 2 different ECM wiring harness so the ECM could also be suspect, though that would be one of the last things to consider. However, if you've been letting the truck washes power wash your engine then you could have corrosion in some or all of the ECM plugs.

Anyway, that's all I got. Sure someone else has more knowledge than I do...

Edit:
If/when you look at the sensors I would prioritize the cam position sensor. That's probably what caused your recent symptoms. The EGR sensor could be going bad with intermittent faults that come and go too quickly to pop up on your dash. Meaning it's a separate issue that you just happened to notice right now. Either way it sounds like your electrical system could use some cleaning and maybe it's time for an EGR tune-up.