P0476 Code - Exhaust Pressure Control Valve 'A' Range/Performance

Discussion in 'P - Powetrain Codes' started by fault code, Jan 18, 2018.

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  1. fault code

    fault code Administrator Staff Member

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    What Does P0476 Mean?

    The most common cause for a P0476 code has to do with a Faulty Exhaust Back Pressure Valve. Other causes include an open or shorted Exhaust Back Pressure Valve harness or a poor electrical connection in the Exhaust Back Pressure Valve.

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    What are the common causes of P0476 ?

    In most cases, this code is caused by a clogged back pressure tube and/or exhaust back pressure sensor. However, technicians also report that damaged and burnt electrical wiring and connectors are a possibility. The PCM could also be faulty but this is highly unlikely.

    How do you troubleshoot P0476 ?

    With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble.



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