Does anybody have any advice on how to cure the belt squeek upon shutdown. The dealer says there is nothing they can do. They say that some engines just do that. I personally have never heard one. Please help.

I've heard of a few different things for belt squeal. First one was a few drops of dish soap. Personally I use a good silicone based spray while the belts moving. Just watch you're eyes for blow back.

I switched belts to a goodyear brand. Has cross section grooves on the underside. Supposed to help stop better. My squeak is gone anyway.

Here is the TSB that you need. I got my alternator replaced and that solved the problem at shut down. You can also try searching the forum for other things.:thumb: Fill out your Sig too that will help other answer your questions.

Accessory Drive Belt (1367 mm) Part Number 98035628

No part number on the alternator, but here is the bulletin for it


Subject: Drive Belt Chrip When the Engine is Shut Off - keywords 6.6 accessory alternator engine generator LBZ LLY noise off pulley squeak wear #PIP3772B - (07/17/2006)



Models: 2006 Chevrolet Express, Kodiak, Silverado

2006 GMC Savana, Sierra, TopKick

Equipped with a 6.6 Duramax Diesel Engine RPO codes LBZ or LLY




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The PI was revised to include information on dual alternator systems. Please discard PIP3772A.


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The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
The customer concern will be a accessory drive belt chirp when the engine is shut off. Belt chirp when the engine is shut off has always been a characteristic of the diesel engine. The belt chirp is caused by the high engine compression and the rapid stopping of the crankshaft. Due to a larger/higher output alternator, the belt chirp on a 2006 diesel engine equipped vehicle may be slightly louder than a older model vehicle. Some 2006 diesel engines may already have a clutched alternator pulley to reduce the amount of belt chirp when the engine is shut off.

Recommendation/Instructions:
If a 2006 diesel engine equipped (LBZ or LLY) vehicle has come to the dealer with a customer concern of a belt chirp when the engine is shut off, and the vehicle does not have a clutched alternator, a clutched alternator can be installed to reduce or eliminate the shut off noise. No special part number or ordering is needed. If the current part number for a new alternator is ordered from GMSPO, a clutched alternator will be shipped.

Note: The clutched pulley alternator is only used on single alternator systems. If the vehicle is equipped with a dual alternator system (RPO code 8X5), the clutched alternator cannot be used.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
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What ruff said. Had my alt. changed to a clutched one. No more chirp. Covered under warranty.

so what if you have dual alts? what can i do?

so what if you have dual alts? what can i do?

Not sure on that one. Like I said do a search. Someone somewhere on here has had the same problem too.

I had the same problem. Took mine to the dealer and they changed the belt, and the chirp dissapered. All covered under warranty.

thanks for the info

Well it is a diesel and they do that sometimes. Might want to search out the other threads that have covered this topic repeatedly.. Good luck

just got back from the dealer an showed them the tsb for the new clutched alternator to fix shutdown chirp. they orderd new alt for me. i'm going to take my gatorback/goodyear belt with me when service is done an have them put it on. maybe i'll be sqeek,chirp free. i had them replace belt before, it was jus a temp fix. they're doing this on good will, my truck has 60,000 mls on it.:D

If you have dual alternators couldn't you swap them for two clutched versions ??

OOPS, I just read the TSB, I guess you can't do that with a dual altertnator system. I wonder why not?

The dual alts have a lower amp per alt than a single alt system. I believe it is 105amp each on dual. 145 on single

The dual alts have a lower amp per alt than a single alt system. I believe it is 105amp each on dual. 145 on single
i added 2nd alt. but my factory 1st alt. is 145 amp

just got back from the dealer an showed them the tsb for the new clutched alternator to fix shutdown chirp. they orderd new alt for me. i'm going to take my gatorback/goodyear belt with me when service is done an have them put it on. maybe i'll be sqeek,chirp free. i had them replace belt before, it was jus a temp fix. they're doing this on good will, my truck has 60,000 mls on it.:D
I JUST HAD THE DEALER PUT THE NEW CLUTCHED ALTERNATOR, AND I TOOK THEM A GATORBACK BELT ALSO TO PUT ON. ITS NICE FINALLY TO HAVE MY TRUCK WITH NO MORE CHIRPING SQEEKING AN SQWAUKING SOUNDS. THEY FIXED ON GOOD WIIL/FAITH. TRK HAS 60,000 MLS. CAUSE I TOOK IT TO THEM BEFORE WHILE STILL UNDER WARRANTY THEY JUS REPLACED BELT, BUT WAS JUS A TEMP FIX. GOODLUCK:smoke2::saluteusa:

This souds like something that I will look into tomorrow. Thanks for all the good info guys, there is a lot of good informaiton on this site.