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Time:2019-02-20 11:11Turbochargers information Click:

Eng Check Light fix codes


04-09-2015, 11:24 PM     #  


Senior Member


Join Date: Jan 2010

Location: Kerrville, TX

Posts: 153


Check Eng Light-Codes-Fix?

Hope to get some wisdom here!

We have a 2009 Newmar Grand Star front engine diesel, Cummins ISB. Been getting check engine light when using exhaust/engine brake, on long grades..etc. Home now so have the motorhome into TX Custom Coach and they read these codes today:

--Code SPN 641 FMI Eng VGT Actuator failed Occurrences 29 times
--Code SPN 2633 FMI 7 VGT 1 Nozzle position Occurrences 108 times.

One idea is that the variable turbo actuator need to be replaced?
Your thoughts?

In a hurry to get fixed, so any help is much appreciated!



Curt & Susan 2009 38' Newmar Grand Star 3752
Front Engine Diesel Freightliner Chassis Cummins 340 ISB/Allison
Toad: Honda Element, Ready Brute integrated tow bar and braking system, Protect-a-Tow


Check Eng Light


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04-12-2015, 09:56 AM     #  


Senior Member



Join Date: Jun 2013

Location: Pa

Posts: 107


That's what it looks like. I have a monitor that I can keep an eye on things and it reads all codes and clears them if needed. Great tool to have.


2008 GMC Duramax 3500HD CC,LB,DRW With some hidin power mods 2007 Mobile Suites 36 SB3



04-12-2015, 11:56 AM     #  


Senior Member


Join Date: Aug 2002

Location: Where ever I park it

Posts: 1,317


That sounds like a turbo problem. The moveable parts are not moving quite as they should. The normal fix is to replace the turbo, but they can be repaired. This will give you an idea what I mean.


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