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