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joebedford's avatar
joebedford
Nomad II
Mar 02, 2018

Duramax oil pump whine?

I have a 2011 3500HD CCLB.

It's been making a whine at idle for some time now. Research is unclear on whether this is a serious problem or not. It's a big deal to replace - apparently the motor and trans have to come out.

Anybody else have this noise and what did you do about it?
Tow Vehicles
  • ScottG's avatar
    ScottG
    Nomad
    Mar 03, 2018
    Apparently not an issue that results in damage but GM has a fix:

    Condition/Concern
    Some 6.6L (RPO LGH and LML) engines built before May 2012 may exhibit an engine buzz, moan, rattle, whine, or vibration type noise that can typically be heard at idle or low RPM. The noise may be hard to duplicate, change in intensity, and/or phase in and out when listened to for a long period of time.

    The noise will be the loudest near the bottom of the oil pan. The noise is generated by fluid pulsations inside the oil pump. Oil pressure readings will be normal.

    Recommendation/Instructions
    If the concern of an oil pump whine noise has been identified, the repair is an updated oil pump. The parts catalog has been updated with the revised oil pump part number. Order the current GMSPO/CCA oil pump as listed in the parts catalog for 2010 through 2012 6.6L (RPO LGH and LML) engines.

    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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