2008 Discovery w/350 Cummins check engine!

Took the coach back yesterday for its appointment and they called today to tell me the turbo is in need of replacing also. Not the news I wanted to hear but it is what it is, 75,000 miles on it I guess things don’t last forever.

Took the coach to a Cummins dealer this morning and they scanned it and the fault I am getting is caused by (I forget what they called it) something on top of the turbo, made an appointment to get it replaced.

I just came in from learning how to use the diagnostic part of my computer type dash, when I got to stored faults it said none (this is what the local garage told me as well)
I am going to take it to a citified Cummins garage as suggested. I have washed out the radiator twice already this summer, have had both fuel filters replaced, I checked the coolant level and it is full, the temperature will rise on a pull/grade and the fan will kick on and it will start dropping. It runs around 190* and will climb to 205* then you can tell the fan kicks on because it will hold there or go up a little more then start dropping back to the 190’s
Thank you so much for all the reply’s as it helps me remember to check things a little closer.
I will reply with what the shop finds, thanks again, Barney

Our 350 did that too, turned out to be a low fuel pressure, a filter change cured it.

For the price of visiting a service center to get codes read, buy a Vmspec Silverleaf software and cable for your laptop.

This gives you real-time display of all your parameter including normal ranges and what’s over/under.

Plus when you get the code explanation you can call their tech support and they can help you diagnose the problem.

I was getting check engine intermittently and it was a tight wire pulling hard on the turbo boost sensor. Under load the engine would lean some and wire would pull the connector off enough to send a false reading.

Is your temp gauge saying it’s hot?

Mine doesn’t rise on an uphill.

Take it to a Certified Cummins dealer (Class 6-8 truck dealer and have them plug into the diagnbostic port. One thing about a diesel is that when you get a check engine light it needs to be addressed pronto. Diesel repairs are EXPENSIVE.

You might also check and clean the radiator as the fins get full of gunk and don't let much air through the radiator. Many don't clean it often enough and it can cause overheating when pulling a long hill.

Check engine pulling a hill is sometimes because of low coolant. I get that once in a while when coolant got a little low in the bottle. Have mine filled to MAX when cold and no more issues.