Duramax Diesels Forum Truck of the Week
  #1  
Old 11-05-2017, 01:50 PM
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Josh154 Josh154 is offline
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Default Service 4wd

Been having a intermittent service 4wd issue since last winter. Sometimes it will go into 4wd fine and other times it wonít. I just replaced the front diff actuator and encoder motor. Well Iím still having the issue so we read the codes with a solus last night and getting c0379 for the front diff not engaging. I just changed the diff fluid today, it was a chocolate milk brown looking and didnít have much metal shavings on the plug. About the same as last time I changed it. Also sometimes when it says itís in 4 hi itís really only in 2wd and sometimes it goes into 4 hi just fine. Other times it wonít even go and just says service 4wd system. Any ideas?
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08 CCSB LMM - HSP 369sxe kit, 10mm S&S cp3, built trans with suncoast 1058, supporting mods and Danville tuned
Best 1/4 mile
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  #2  
Old 11-05-2017, 02:06 PM
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Default Service 4wd

What kind of encoder motor did you put on it? GM or aftermarket?


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2003 GMC CCSB LLY
Built by me, tuned by me.

2009 ECI Diesel Truck Points Champion
2010 ECI Diesel Truck Points Champion
2011 ECI Diesel Truck Points Champion
2012 ECI Diesel Truck Points Champion

Big thanks to everyone who helps me.

Best 1/8th, 7.29, 98.6MPH (Street tires, fuel only, single Journal bearing GT42 charger) (2010)

Best 1/8th, 6.93, 104.24MPH (Street tires, fuel only, single HX60 turbo) (2016)

Best 1/8th, 6.60, 106.6MPH (Street tires, fuel only, single HX60 turbo) (2017)
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  #3  
Old 11-05-2017, 02:16 PM
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Gm. You can hear the motor clicking like the t case is going into 4. Both motors have gave me the same symptoms and both actuators have gave me the same symptoms.
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08 CCSB LMM - HSP 369sxe kit, 10mm S&S cp3, built trans with suncoast 1058, supporting mods and Danville tuned
Best 1/4 mile
12.86 - 104.92mph
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  #4  
Old 11-05-2017, 02:19 PM
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Have you checked the grounds good?


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__________________
2003 GMC CCSB LLY
Built by me, tuned by me.

2009 ECI Diesel Truck Points Champion
2010 ECI Diesel Truck Points Champion
2011 ECI Diesel Truck Points Champion
2012 ECI Diesel Truck Points Champion

Big thanks to everyone who helps me.

Best 1/8th, 7.29, 98.6MPH (Street tires, fuel only, single Journal bearing GT42 charger) (2010)

Best 1/8th, 6.93, 104.24MPH (Street tires, fuel only, single HX60 turbo) (2016)

Best 1/8th, 6.60, 106.6MPH (Street tires, fuel only, single HX60 turbo) (2017)
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  #5  
Old 11-05-2017, 02:25 PM
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The grounds on the frame rail underneath drivers door? Those were pulled off and cleaned when trying to find my communication error a couple weeks ago. All fuses were gone over also.
__________________
08 CCSB LMM - HSP 369sxe kit, 10mm S&S cp3, built trans with suncoast 1058, supporting mods and Danville tuned
Best 1/4 mile
12.86 - 104.92mph
Reply With Quote
  #6  
Old 11-05-2017, 02:39 PM
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Yes those.


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__________________
2003 GMC CCSB LLY
Built by me, tuned by me.

2009 ECI Diesel Truck Points Champion
2010 ECI Diesel Truck Points Champion
2011 ECI Diesel Truck Points Champion
2012 ECI Diesel Truck Points Champion

Big thanks to everyone who helps me.

Best 1/8th, 7.29, 98.6MPH (Street tires, fuel only, single Journal bearing GT42 charger) (2010)

Best 1/8th, 6.93, 104.24MPH (Street tires, fuel only, single HX60 turbo) (2016)

Best 1/8th, 6.60, 106.6MPH (Street tires, fuel only, single HX60 turbo) (2017)
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  #7  
Old 11-05-2017, 02:41 PM
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Yeah i cleaned them with a wire brush. Could my switch be bad and not give a signal to the front diff to engage? Or what tells the front diff to engage? Could a shift fork be sticking in the front diff?
__________________
08 CCSB LMM - HSP 369sxe kit, 10mm S&S cp3, built trans with suncoast 1058, supporting mods and Danville tuned
Best 1/4 mile
12.86 - 104.92mph
Reply With Quote
  #8  
Old 11-05-2017, 02:49 PM
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Hmmm. I suppose a switch could cause it. I would be more suspect of the TCCM at this point though.


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__________________
2003 GMC CCSB LLY
Built by me, tuned by me.

2009 ECI Diesel Truck Points Champion
2010 ECI Diesel Truck Points Champion
2011 ECI Diesel Truck Points Champion
2012 ECI Diesel Truck Points Champion

Big thanks to everyone who helps me.

Best 1/8th, 7.29, 98.6MPH (Street tires, fuel only, single Journal bearing GT42 charger) (2010)

Best 1/8th, 6.93, 104.24MPH (Street tires, fuel only, single HX60 turbo) (2016)

Best 1/8th, 6.60, 106.6MPH (Street tires, fuel only, single HX60 turbo) (2017)
Reply With Quote
  #9  
Old 11-05-2017, 02:49 PM
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Josh154 Josh154 is offline
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Transfer case control module?
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08 CCSB LMM - HSP 369sxe kit, 10mm S&S cp3, built trans with suncoast 1058, supporting mods and Danville tuned
Best 1/4 mile
12.86 - 104.92mph
Reply With Quote
  #10  
Old 11-05-2017, 02:51 PM
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IOWA LLY IOWA LLY is offline
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Posts: 2,267
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Yes.


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__________________
2003 GMC CCSB LLY
Built by me, tuned by me.

2009 ECI Diesel Truck Points Champion
2010 ECI Diesel Truck Points Champion
2011 ECI Diesel Truck Points Champion
2012 ECI Diesel Truck Points Champion

Big thanks to everyone who helps me.

Best 1/8th, 7.29, 98.6MPH (Street tires, fuel only, single Journal bearing GT42 charger) (2010)

Best 1/8th, 6.93, 104.24MPH (Street tires, fuel only, single HX60 turbo) (2016)

Best 1/8th, 6.60, 106.6MPH (Street tires, fuel only, single HX60 turbo) (2017)
Reply With Quote
  #11  
Old 11-05-2017, 02:56 PM
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Do you know a part number? Is this something the dealer needs to reprogram for me?
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08 CCSB LMM - HSP 369sxe kit, 10mm S&S cp3, built trans with suncoast 1058, supporting mods and Danville tuned
Best 1/4 mile
12.86 - 104.92mph
Reply With Quote
  #12  
Old 11-05-2017, 02:59 PM
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Josh154 Josh154 is offline
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Found a thread where several people have same issues but no resolution
http://www.duramaxforum.com/forum/06...4wd-c0379.html
__________________
08 CCSB LMM - HSP 369sxe kit, 10mm S&S cp3, built trans with suncoast 1058, supporting mods and Danville tuned
Best 1/4 mile
12.86 - 104.92mph
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