P20A7 Buick Enclave OBD Code

OBD/2 P20A7 error code description and symptoms.

HO2S Sensor Circuit Malfunction (HO2S-11) During testing the HO2S Heaters are checked for opens/shorts and excessive current draw.
The test fails when current draw exceeds a calibrated limit and/or an open or short is detected. Short to VPWR in harness or HO2S. Water in harness connector. Open VPWR circuit. Open GND circuit. Low battery voltage. Corrosion or poor mating terminals and wiring Damaged HO2S heater. Damaged PCM.

As long as the throttle plate remains closed, the idling speed and quality is controlled by the PCM via the idle control valve, and as can be seen from the above it should be clear that idle control on a gasoline engine is a complex affair. For instance, if the engine is started in sub-zero temperatures, the PCM will command the idling control valve to allow less air to enter the engine to enrich the air/fuel mixture to create a condition which is roughly analogous to how chokes worked on carburetted engines to control idling in cold weather.

P20A7 Buick Enclave Error Code Repair Process :

If your p20a7 reductant injection air pressure control valve performance check engine light is illuminated, it's best to take it in for diagnostic testing, which can feel like a hassle. Because while the lights vary in appearance from vehicle to vehicle, all have the same basic meaning: There's a problem with the car's emissions system. The on-board diagnostics system P20A7 and engine control unit are in charge of monitoring a bunch of different p20a7 reductant injection air pressure control valve performance, and if they get a reading that's a little out of whack, up pops the check engine light.

Common Causes of Buick Enclave P20A7 OBD2 Code

A common cause of code P20A7 is the failure of P20A7 Reductant Injection Air Pressure Control Valve Performance, but there are several other possible causes as well, such as ;

Exhaust tube
Continuous oil flow to the VCT piston chamber
Fuel Injectors circuit poor electrical connection
Faulty select solenoid

P20A7 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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P20A7 Buick Enclave OBD Code

P20A7 Buick Enclave Error Code Repair Process :

Common Causes of Buick Enclave P20A7 OBD2 Code

P20A7 code for other Buick cars