P51A4 Chevrolet Chevelle OBD Code

OBD/2 P51A4 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.

One example of this would be when an automatic vehicle in placed in gear. To prevent the added drag from the torque converter and transmission from reducing the idling speed, the PCM will command the idle control valve to allow more air to enter the engine, while at the same time, adjusting the injector pulse width to inject more fuel to suit the increased amount of air. Note that the idle air control valve is closed by the PCM when the throttle plate is opened to prevent excess air from entering the engine.

P51A4 Chevrolet Chevelle Error Code Repair Process :

The scent may P51A4 signal oil or coolant leaking from their normally closed-loop systems, or it may indicate dangerous exhaust gases invading your car's interior. Car and truck exhaust contains toxic gases such P51A4, so if the inside of your car as if you were standing behind your car, get out and get it fixed. Fight the urge to take a little nap first. So sleepy. That's the carbon monoxide talking, friends. At least open a window on your way to the shop.

Common Causes of Chevrolet Chevelle P51A4 OBD2 Code

A common cause of code P51A4 is the failure of , but there are several other possible causes as well, such as ;

Dirty Oil
Faulty Variable Camshaft Timing (VCT) position solenoid
Fuel injectors may be faulty
1Camshaft Position Sensor circuit poor electrical connection

P51A4 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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P51A4 Chevrolet Chevelle OBD Code

P51A4 Chevrolet Chevelle Error Code Repair Process :

Common Causes of Chevrolet Chevelle P51A4 OBD2 Code

P51A4 code for other Chevrolet cars