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Duramax Third Generation: 2006-2007.5 (LBZ & LLY) Discuss the third generation (2006-2007.5 LBZ & LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion also belongs in this forum due to the similarities of the 2006 LBZ and the 2006 LLY. Engine related discussion ONLY.

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Old 04-28-2019, 06:10 PM   #1 (permalink)
SAYWHAT
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U1026 code

Started truck and got a U1026 code. Cleared code and it did not return. Any one have information on this that will help diagnose the problem. Thanks

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Old 04-28-2019, 06:24 PM   #2 (permalink)
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Quote:
Originally Posted by SAYWHAT View Post
Started truck and got a U1026 code. Cleared code and it did not return. Any one have information on this that will help diagnose the problem. Thanks
Here is a thread on DTC U1026:
https://www.dieselplace.com/forum/63...026-w-t-f.html

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Old 04-28-2019, 07:37 PM   #3 (permalink)
SAYWHAT
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Thanks Ok Dually. Have used the search and google but nothing more to help me. Have not added anything to truck, have not used 4-wd in a while. Truck runs fine! Maybe just a glitch?
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2007 Classic GMC D/A Ext. cab,s.b.,built 11-2006,Di*Priol boost and pyro gauges,GT3794VA turbo, Edge Insight CTS,Garmin GPS,MBRP catback exhaust,300* hose permanent fix tranny cooling lines,M/A pump rub kit,Prodigy bc,Reese 16,000 lb. slider 4-way tilt hitch.Luverne SS side steps,Truxedo bed cover, Duraflaps all 4 corners, Michelin LTX M/S 2 tires and Bilstein shocks.
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Old 04-28-2019, 09:03 PM   #4 (permalink)
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Quote:
Originally Posted by SAYWHAT View Post
Thanks Ok Dually. Have used the search and google but nothing more to help me. Have not added anything to truck, have not used 4-wd in a while. Truck runs fine! Maybe just a glitch?
Batteries that are going weak can cause weird electrical gremlins.
I would load test your batteries one at a time just for good measure.
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1996 K3500 6.5L,( "F" Eng #141 cast block) 5 speed manual, crewcab, dually longbed: 208,000mi.
Diamond Eye 4" Turbo Back Exhaust w/2.5" Flo-Pro Crossover
AirDog II DF165 w/ tank sock delete - XDP
TD-Max boost controller - Kennedy Diesel
OPS extension hose - Leroy Diesel
Glow Plug Harness- PT Wiring Solutions
Glowshift Maxtow EGT,Boost, Fuel gauges
Boost & Fuel Pressure Bolts - Leroy Diesel
2/0 Battery Cable Upgrade - PT Wiring Solutions
PMD w/#9 resistor and Re-Location Kit, mounted to bumper - Leroy Diesel
GM-5 Turbocharger
4.10 gear ratio
OptiLube summer + Formula


Proud member #1039 of The 3500 Dually Club

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Old 04-29-2019, 08:19 AM   #5 (permalink)
G2GBY
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Originally Posted by SAYWHAT View Post
Started truck and got a U1026 code. Cleared code and it did not return. Any one have information on this that will help diagnose the problem. Thanks
I have this code stored all the time for 12 years and never goes away. Everything works normal and no CEL light. I don't bother with it.
Code:U1009
Transfer Case Shift Control Module (TCSCM)

Code:U1026
Description:Lost Communications With Transfer Case Shift Control Module (TCSCM)

Last edited by G2GBY; 04-29-2019 at 08:29 AM.
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