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Discussion Starter · #1 ·
I have an 04 duramax with 100k on it. Last night I went into 4wd to get out of muddy pasture for a min and then I turned it off when I hit the pavement and thats when I noticed it said service 4wd. What does that mean and what and how do I service the 4wd? Any help greatly appreciated.

Thank you
 

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mine has done that a couple of times, everything checked out ok [fluid levels] 4wd always works when I need it although I dont use it much. I think the last time it did it it was slow switching back to 2wd?
 

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My moms 05 Tahoe got this message in Pismo one time. It wouldnt come out of 4x4, turns out water got into the harness for the electric 4x4 engagement.
 

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post the codes if it has any. it is either the switch or the encoder motor sensor
 

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Check the Electrical connections on the Actuators (2), on the front Diff and Trans case, and the Fluids And make sure it is working, Jack up truck and turn 4 low for a few min , and 4 high for a few min, make sure it stays in and not popping in and out.
 

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Discussion Starter · #9 ·
Thank you for all the great tips. I got in my truck this morning and message was gone, but I will look into it more with all your tips. Thank you again.

Lol. sub that would make sense with the little guy eating popcorn watching.
 
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