Forum Discussion

Gkaiser's avatar
Gkaiser
Explorer
Aug 27, 2020

GM LLY Starter Grind

I have read countless forum posts on GM Diesel Websites on this issue, but none have come up with a successful 100% fix
RV's know stuff so I thought I'd try it here! :)

Does anybody know officially how to fix the LLY GM 6.6l Diesel Starter grind issue. I have replaced the starter with aftermarket and Delco Starters. and have been told that the flex plate in the past was in good shape. I have read countless forum posts over the years that people have said the same things. but NOBODY has a post on a "this is the problem and I fixed it."

My thoughts is it has to be an electrical voltage issue. I changed the relay under the hood, no change.
If 3 or 4 different starters have the same result it can't be the starter.

Now I am thinking the ignition switch ( not the key part but the part under that)or battery cables.

When the truck was new it happened occasionally … as it has gotten much older it is more frequent.
  • Gkaiser wrote:
    See my point exactly … they all say they replaced starters and flywheels, ( flex plates) and still getting same result. one guy said he replaced the starter 6 times and now its fixed … hard to believe that. maybe he finally got a good connection on his battery cable!?


    Post #27 He said new GM starter and flywheel took care of the issue... I have owned several and know people with Duramax trucks and have never hears of this...
  • See my point exactly … they all say they replaced starters and flywheels, ( flex plates) and still getting same result. one guy said he replaced the starter 6 times and now its fixed … hard to believe that. maybe he finally got a good connection on his battery cable!?