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Code p0499 for chevy silverado 1500 2009 emission

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Posted on Jan 02, 2017

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SOURCE: fault code P0499 has be


P0499 Evaporative Emission System Vent Valve Control Circuit High. There is an electrical problem with the canister solenoid circuit. You need to replace the solenoid.

Try this first.....Disconnect the NVLD Assembly harness connector. Measure the resistance of the NVLD Solenoid coil. The resistance should be between 7.5 and 8.5 ohms. If not then you need to replace the NVLD Assembly.
Probe the wire side of that connector, wire color "white with dark green stripe" (power) and other side of tester to a GOOD ground, or negative power. Is the voltage above 1.0 volt? If yes. You have a short in the wiring .. Follow the wiring from the NVLD up to the engine compartment looking for the problem.

Please get back to us if you have further query else please accept the suggestion.

Thank you for contacting

Posted on Jan 05, 2011

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