The P0490 trouble code means the engine control module (ECM/PCM) has detected an abnormally high electrical condition in the control circuit of the Exhaust Gas ...
The P0489 diagnostic trouble code means that the engine control module (ECM/PCM) has detected an abnormally low electrical signal in the EGR “A” control circuit...
The P0488 trouble code means the engine control module (ECM/PCM) has detected that the EGR throttle control circuit "A" is not operating within its expected ran...
The P0486 trouble code means the engine control module (ECM/PCM) has detected a malfunction in the circuit associated with the Exhaust Gas Recirculation (EGR) S...
The P0485 diagnostic trouble code means that the engine control module (ECM/PCM) has detected a problem in the power or ground circuit of the engine cooling fan...
The P0484 trouble code means the engine control module (ECM/PCM) has detected that the cooling fan circuit is drawing more electrical current than expected....
The P0482 trouble code means the engine control module (ECM/PCM) has detected a malfunction in the control circuit for Cooling Fan 3....
The P0479 trouble code indicates that the engine control module (ECM/PCM) has detected an intermittent electrical or control signal from the Exhaust Pressure Co...
The P0478 OBD-II trouble code means the engine control module (ECM/PCM) has detected an abnormally high electrical signal or control condition in the circuit fo...
The P0477 trouble code indicates that the engine control module (ECM/PCM) has detected a low electrical condition in the Exhaust Pressure Control Valve "A" cont...
The P0439 diagnostic trouble code means the engine control module (ECM/PCM) has detected a problem with the catalyst heater control circuit for Bank 2....
P0438 means the engine control module (ECM/PCM) has detected an abnormally high electrical signal from the catalyst temperature sensor circuit on Bank 2, Sensor...
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