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  1. P

    '05 Duramax 6.6 LLY PO299

    New to the Forum. I have a 2005 Pony Express Motorhome on a C5500 Kodiak chassis with a 6.6 LLY Duramax and Allison trans bone stock with 46,000 mi. While driving, the CEL comes on and the engine loses power. The scanner reads a PO299, turbo underboost, that's the only code it shows. The engine...
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