2009 GMC Yukon Hybrid with 22,000miles. Needs front differential replacement. What could cause this after 22000 miles? Is this something that will continually re-occur?

do you know what gear ratio they are then I suggest using car-part.com to find a local junkyard with the right gear setup you need. and it can be a dirty job. getting the bolts loose will be your hardest problem. and getting a Haynes or Chilton book is a good idea for 20 25 bucks you can read about it before you go doing it and decide its something you might try

Sounds like you may have an issue with your transfer case control module. I am a big fan of using a scan tool for diagnosing things, so if you can get your hands on one, I highly recommend it. It takes guesswork out of fixing things the right way. If you can duplicate the concern and get a scan tool connected at the same time, I would check to see if the scan tool can communicate with the transfer case control module while the problem is present. That will tell you a lot right there. Also check other modules to see if any DTCs related to the 4WD are set. That is also helpful. Or... when the problem occurs, go to the underhood fuse block (driver's side near the battery). Pull the TREC 30 amp fuse for about 20-30 seconds. Plug it back in. See if the problem goes away. If it does, the most likely cause is a logic-lock in the transfer case control module. There may be a software fix for that. If not, the only cure is to replace it.

Sounds like you need to replace your ujoints. Or possably your carrier bearing. This is most common in these vechiles.And is part of your 100.000 mile tune up.If you need help replacing let me know.If you have to take to a shop it would cost around $50 plus parts. Best of luck to you and thank's for using Fix Ya

Its a collision safety switch that has been triggered, it needs to be reset.

A technician will need to a parasitic drain test on the electrical system to determine where the battery drain is taking place. Sometimes the glovebox or vanity mirror lamps don't shut off and drain the battery.

Is it really burning blue smoke out the exhaust or leaking out all the wrong places like valve covera and front and rear seals? There is no solution here except find out the cause of the loss and fix it.

If it is the same as a 2008 GMC Yukon with conventional power, it comes out of the front wiper fluid reservoir!

if you look in owners manual all maint. sched. is in it.

replace fuel filters.adrian

coolant flush and fill.. differential oil changed out ( assuming you have done trans service already also ) .. driveline (u-joints) and steering linkage lubed , fuel filter(s)..and all belts /hoses inspected ... have fun :)