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Found 5 results

  1. Recently lost my 4WD when shifting it from 2WD to 4WD. I have electronic shift dial on the dash. I've replaced front diff Encoder motor, T-case Shift motor. Last week after I swapped the Tcase motor the 4WD worked again for about 2 days. Now its out again. Ran codes on it today at Oreilly's and its got CO 387 and CO 374. Looks like the 374 is a 4WD speed Sensor? and that failing is throwing the other code 387? Any ideas on what the root cause would be?
  2. Hello everyone, I have an issue this morning with my z71. I loaded my truck down with house hold garbage.. Turned on the truck no issue that I noticed ( Havent started the truck in a week) Got in to drive then noticed all the lights on the 4wd selector on the dash were lit and the service 4wd was reporting on the dash console. I unhocked the battery for 5 mins and tested again, same issues. Hooked up tester ODB2 no errors. Can anyone help me with this? Any advice?
  3. So, yesterday afternoon, I jump in my tuck after running errands. service notice flashes says "service 4wd" I dis miss this, check my 4wd knob and its in AWD, where it stays unless I need 4wd. I go to back up and turn and its clear Im in 4wd. Cannot get it out of 4wd. Tried running through 2wd/4hi/4lo etc. nothing no shifting at all. I drive a lot so my truck is at about 54K (its a 2015, bought in 2015) and I have had no issue with it so far. great truck. no complaints. So, I drive into town today, call the dealership (who at first said they couldn't look at it till Tues- wed) they eventually say they can squeeze me in today around 2. Great! I think this is great. Still under warranty, if it has to be messed up better now then in 6k more miles right!- but wait. looking up their warranty the most likely culprits (wiring, tccm etc) aren't covered under warranty. Really. with so many others having this problem?... I can accelerate and drive it, turns are irritating. Seeing that there aren't any real "fixes" for this since 2014 not a good start to this week. Anyone find anything that seems to have stopped this action from reoccurring?
  4. I'm posting this to help others who may have the same or similar issue. i spent hours on the interweb trying to find this information and it took multiple sources to finally find the answer. At issue was a 2005 GMC K1500 104K miles, the NP246 transfer case started acting weird in the summer of 2016, inquiries on the net led me to replacing the 4WD dash switch. After swapping the new and old switches in and out a few times the problem with the transfer case not shifting, erratic indicator lights, the TC being engaged in the wrong mode, etc. seemed to be fixed, but I didn't trust it. In May 2017 in the middle of a long road trip, the TC problem reappeared. The indicator said it was in 2WD, but there was a drag on the drive line. It remained in a HI range and the drive line did not bind on dry pavement and it cleared up rather quickly so that I could make the 1500 mi. trip home. When I was home I did more interweb searching and found many "encoder" threads on various forums. I ordered a Dorman brand encoder ring on Amazon and was in no hurry to install it, but a few days ago the drive line drag came back. Got the encoder off the truck and replaced the ring, marking the drive and driven gears to insure alignment. But it would not go back onto the TC, the shift shaft on the TC and the socket in the encoder were very slightly misaligned. I could turn the shaft slightly by hand, but not enough to align them and was cautious about using force. The blind spline on the TC shaft was at about 7 o'clock, but I did not know what mode it was in. There was a forum entry saying to use the dash switch to shift the encoder to the last known mode that the TC was in before the encoder was removed. I did this, heard the motor whir and when I looked at the socket it was at about 11 o'clock, now it's way off and I don't know how to get it closer. More searching said to get the rear wheels jack off the ground as to allow turning the driveshaft with the trans in neutral and using a pliers or vise-grips to manually shift the TC. Doing this I discovered that neutral was with the blind spline being at 6 o'clock. But I now need to get the encoder to 6 o'clock. I stumbled upon a You Tube spam video by Delco that offered the final answer, see the link. I followed those instructions to align the bull gear in the encoder by using timing marks on the gear and case that will set blind spline in the gear and the encoder ring to neutral. I hope this long winded explanation and link helps someone.
  5. Service 4wd is coming on for my 05 Yukon XL 150. We bought the truck at 62k and it now has 85k. Normal maintenance for the transfer case is 50k I think. Is there a service message that comes on once you've exceeded a mileage threshold for the 4wd if it hasn't been reset? What might be some other potential problems ? Thank You ! Wendy
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