05 Tahoe Z71 4WD concerns

[Krch0210]

I drive a 2005 Tahoe Z71 with 55K.

While driving today I noticed my Dash display said "Service 4WD". This is the first time I have seen this message. My vehicle was not in 4WD when it occurred. I parked my car for about 1.5 hours. Got in it and drove for about another 15 minutes and when parking again I noticed the "Service 4WD" again. I drive my vehicle in AUTO 4WD all of the time. I put the vehicle in NEUTRAL and tried to put it in 2WD, 4HI and 4LO. It would not let me do any of those. After leaving work a few hours later I pulled into my parking pad and the "Service 4WD" light never came on. I turned the vehicle off and then back on where it showed the red neutral light briefly and went into 4HI. I was then able to change it to AUTO 4WD but nothing else. I could only toggle between AUTO 4WD and 4HI. I also did not hear the transfer case engaging when toggling between the two. I have read on other websites that it can either be the encoder motor within the transfer case or possibly the 4WD switch within the vehicle.

Does anyone have any suggestions? Or have had any experience with this problem.

Any details would be greatly appreciated.

 

[Jeff M]

I drive a 2005 as well and had similar problem, in my case I could not get it out of 4 wheel low. Prior to that however I had intermittent issues with it getting stuck in 4-hi and Auto and just couldn't get it in 2 wheel. It was under warranty at the time so it went back to the dealer several times before finally being fixed and it was the motor / actuator that was the problem. That was 100k miles ago and the problem has never returned, I believe you can buy the part aftermarket from Rock-Auto for ~$170. I hope this helps

 

[Krch0210]

Thanks, I appreciate your help. This morning I got in my truck and 4HI was light up. I was then able to change it to AUTO 4WD. The "Service 4WD" light did not come on either.