P0490

2017-10-10

Description:

  • The fault code P0490 indicates a high voltage condition in the exhaust gas recirculation (EGR) A control circuit. This suggests an issue with the control circuit responsible for regulating the EGR system. A high voltage reading can disrupt the proper functioning of the EGR system, potentially affecting engine performance and emissions.

Possible Symptoms:

  • Check Engine Light illuminated

  • Reduced engine performance or power

  • Rough idling or stalling

  • Increased fuel consumption

  • Failed emission test

Possible Causes:

  • Faulty EGR valve

  • Wiring or connector problems in the EGR control circuit

  • Malfunctioning EGR position sensor

  • Carbon buildup in the EGR valve or passages

  • Faulty engine control module (ECM)

Related Parts:

  • Exhaust Gas Recirculation (EGR) Sensor: Exhaust gas recirculation (EGR) is an emissions reduction technique used in petrol and diesel engines. Problems lead to harmful emissions out of limit

Possible Solutions:

  • Inspect and replace the faulty EGR valve, if necessary

  • Check for wiring or connector issues in the EGR control circuit and repair as needed

  • Test and replace the malfunctioning EGR position sensor, if required

  • Clean the EGR valve and passages to remove carbon buildup

  • Consider replacing the engine control module (ECM) if all components are functioning correctly

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