Power loss

Broken_Season

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May 16, 2014
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San Jose
Hi all, Posting for my grandfather,

He has a 2007 2500 Duramax, and is having power loss issues at random times while towing, Every 2500 miles or so, The latest times power is lost after cresting a long pull up a hill and coming down the back side. Truck enters a limp mode with out throwing codes.

He tells me he replaced the fuel filter and was still having the issue.

What are some items I could have him check before he spends money to drop it at a shop.

Thanks!
 

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