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2004 Dodge Ram 5.7 Hemi Check Engine Light

Home Forums Stay Dirty Lounge Service and Repair Questions Answered Here 2004 Dodge Ram 5.7 Hemi Check Engine Light

This topic contains 1 reply, has 2 voices, and was last updated by Nightflyr * Richard Kirshy 2 years, 9 months ago.

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  • #989287
    Paul Chironna
    Paul Chironna

    My check engine light came on in October when it started getting cold out. When I cold start it there is a very loud whine that slowly goes away as the truck warms up. It came back with code P0456 (Very Small Leak) and I cleared it. The light has come back about 3 times since then and the whine is consistently still there when the truck is cold. Sounds like it’s coming from the driver’s side but I can’t pinpoint exactly where on my own, as it only whines on startup and when I push the throttle. Anything I mention point to a specific culprit? Thanks

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  • #989288
    Nightflyr *
    Richard Kirshy

    My suggestion would be first diagnose the P0456.
    Smoke test the EVAP system to locate the leak.
    This whine you describe could be any one of a number of possibilities:
    Failing accessory IE. water pump, alternator, power-steering pump …
    Failing tensioner or bearing.
    Fan belt
    Cooling fan / clutch
    You’ll need to check each one.

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