Fyi: Update On My 2007 Tahoe

ArmyAviator · December 30, 2009

Dealer diagnosis and repair: One of the differential bearings had failed; wheel bearings were fine.

NOTHING in my paperwork indicated ANY warranty beyond 3yr/36K; however, the dealer showed me some update from GM wherein 2007 and newer are 5yr/100K on most all engine and drivetrain issues.

Praise the Lord.

One more issue: battery would fail if anything left on just for a moment; e.g., leave a door open for 10 minutes or so, and you might not get her started again.

Here's GM explanation to me (seriously): the vehicle's computer constrains the alternator function to a certain depletion threshold before the alternator is permitted to "engage." Well, if you are not quite to that threshold and you shut your vehicle off for any reason, you're now sitting on a depleted battery that will likely fail to start if further depleted from, oh I dunno....the radio...?

So.....the dealer has a campaign that authorizes them to "reprogram" something that enables to the alternator to run when it's supposed to....like when the engine's running. Yup.

Listen, I've no issue with that explanation; they did reprogram it; we'll see and I'll update.

BTW, that reprogram campaign is only covered thru the base warranty of 3yr/36K, so get in there if this applies to you.

--Bryant

Stevens03 · December 30, 2009

Could be just a bad battery... I've had them in the past check out ok, but would fail. I replaced with a new battery and all was good in the world. Hopefully this fixes your issue but if not, I'd consider a new one.

Good luck

ArmyAviator · December 31, 2009

gmtech4, I dunno; it's what the dealer told me; perhaps I called it a campaign and it was something else. They are a small town USA dealer that I trust.

Your words: "ya you have no hub ,ive never replaced one of those bearings ,

don't throw parts at it ,it will pay for a real diag"

Thank you for those, but I'm not sure you're correct; there is hub; a great big sealed unit one. And you agreed with the other poster that the differential fluid pushes out to lube the wheel bearings; tain't so. In this instance the "shavings" in my diff fluid was caused by the pending failure of the differential side pinion bearings; which are now replaced with new ones. That diff fluid cannot reach the wheel bearings.

Thanks for the reply, though.