What does it mean diagnostics code P0490?
What does it mean diagnostics code P0490? Error Code P0490 is defined as Exhaust Gas Recirculation (EGR) “A” Control Circuit High. This means the vehicle's computer has detected an abnormally high voltage within the EGR, often caused by clogging. What does EGR Circuit High mean? Diagnostic trouble code (DTC) P0406 stands for “Exhaust Gas Recirculation Sensor A Circuit High.” It means that the powertrain control module (PCM) perceives a high voltage signal from the exhaust gas recirculation (EGR) position sensor. The PCM uses the sensor signal to monitor and adjust EGR valve operation. What is a EGR sensor? The EGR...