2008 6.4L Running in low power??

[mtcarmelfarm]

My boss has a 2008 6.4L it has been running in low power mode, won't go over 60 and takes its time getting there.
His temperature guage hasn't been working.
Put on scanner and it said can not connect.....
changed fuel filters, looked dirty to me and the one on the rail had metal shavings in it?????
Changed oil, didn't see any antifreeze in oil.
No visible leaks.
Changed temperature sensor and thermostat....
Any idea appreciated.

[MINIs1094]

With the scanner not being able to connect sounds like it might be a power problem with the computer. Maybe a fuse of some sort. On the Freightliners if we can not get it to read the DDEC then we check the fuses and if they are good replace the computer.

[mtcarmelfarm]

It actually says "No communication"

[737tdi]

I would be terribly worried about those shavings in the filter. There have been some 6.4's that have had the hpfp come apart which leads to injectors sticking and grenading the engine. If he is still under warranty I would take that filter and the truck to the dealer asap. JMO.

[twinsberry]

Originally Posted by mtcarmelfarm

My boss has a 2008 6.4L it has been running in low power mode, won't go over 60 and takes its time getting there.
His temperature guage hasn't been working.
Put on scanner and it said can not connect.....
changed fuel filters, looked dirty to me and the one on the rail had metal shavings in it?????
Changed oil, didn't see any antifreeze in oil.
No visible leaks.
Changed temperature sensor and thermostat....
Any idea appreciated.

I had the same problem, took back to dealer. They had to reflash computer, and repair some oil leak. Now I'm back to alot of white smoke while in regen. I assume crack coolant again. Also beginning to smell the odor when in regen.