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  1. P

    '05 Duramax 6.6 LLY PO299

    Finally got results. We found a stuck exhaust brake. (It was stuck in the closed position) The butterfly and shaft were stuck solid. Piston worked OK. I think I used that brake maybe twice since I've had the truck. It's activated by a toggle on the dash. Maybe I should leave it on all the time...
  2. P

    '05 Duramax 6.6 LLY PO299

    All I have is a basic Actron, read and delete codes. I'm waiting for a Tech II. Untill it's available I'll be looking for the obvious. Will let you know what I find, until then thanks for the replys all.
  3. P

    '05 Duramax 6.6 LLY PO299

    WarWagon we recently replaced leaky exhaust manifold gaskets. Everything else is OK. Thefermanator the hoses and tubes to the intercooler were checked and tightened. boost sensor is that on the drivers side of the intake manifold ? BtFarm I wondered what I...
  4. 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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