P04C9 Cadillac Deville OBD Code

OBD/2 P04C9 error code description and symptoms.

Catalytic converters must be warm before they can work properly. On a cold start the PCM provides a rich mixture to keep the cold engine running.
All that extra fuel goes into the catalytic converter. But the exhaust isn't very hot, because, ah, the engine is pretty cold. GM has employed several strategies to fire up the catalytic converter quicker and reduce cold start emissions. One way is to use a secondary air pump that pumps outside air directly into the catalytic converter.

As the engine heats up and combustion becomes easier and more complete, the PCM will command the idling control valve to increase the amount of air entering the engine to suit the changing conditions. However, when the load on the engine changes, say, when some electrical consumers or other systems are either turned on or off, the PCM adapts the signal voltage to the idle control valve to ensure that the idling speed remains stable, and at the RPM specified by the manufacturer.

P04C9 Cadillac Deville Error Code Repair Process :

When you turn on the ignition, the Service Engine Soon or Check Engine P04C9 light should flash briefly, indicating that the OBD system is ready to scan your vehicle for any malfunctions. After this brief flash, the light should stay off while you drive as long as no problems are detected. If unable to bleed - up vacuum in tank so, you'll be glad to know that your vehicle is equipped with an early warning system that could save you time, money, and fuel in addition to helping protect the unable to bleed - up vacuum in tank.

Common Causes of Cadillac Deville P04C9 OBD2 Code

A common cause of code P04C9 is the failure of Unable To Bleed - Up Vacuum in Tank, but there are several other possible causes as well, such as ;

Dirty Oil
Faulty front heated oxygen sensor
Faulty oil control valve (OCV)
Air fuel ratio (A/F) Sensor 1 Bank 1 circuit poor electrical connection

P04C9 is a kind of Powertrain Trouble Code

Powertrain of a modern automobile, comprising engine (with exhaust system), transmission, drive shaft, suspension and the wheels. In a motor vehicle, the term powertrain or powerplant describes the main components that generate power and deliver it to the road surface, water, or air.

Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.

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P04C9 Cadillac Deville OBD Code

P04C9 Cadillac Deville Error Code Repair Process :

Common Causes of Cadillac Deville P04C9 OBD2 Code

P04C9 code for other Cadillac cars