P0490
Exhaust Gas Recirculation Throttle Control Circuit A Circuit High
Generic code
Auxiliary Emissions Control
Medium severity
Moderate repair
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What P0490 means
- 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
Free on OBD DashX
P0490 on OBD DashX
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