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MHH AUTO MHH AUTO FORUMS. General Automotive Help & Discussions. GM Group Opel-Vauxhall, Saab, Chevrolet, GM USA, Chrysler Discussions. 2005 GMC 3500 Trans Issues
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2005 GMC 3500 Trans Issues

86Marlboro  **
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1 05-02-2025, 07:14 PM
Got a 2005 GMC 3500 Dually with Duramax and Allison, VIN#: 1GTJK33235F802589. Transmission throwing a buffet of codes, changes accuator and TCM with no luck. Hoping to get some insight on where to check as far as harness goes without going through the entire thing. I'll attach the OBDII codes below. 
C0306
P0717
C0327
P0748
P0763
P0768
P0773
P0778
P0841
P0843
P0875
P0876
P2810
P0743
P0700

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