P1985 Holden Vc OBD Code

OBD/2 P1985 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.

P1985 Holden Vc Error Code Repair Process :

For exhaust gas recirculation sensor a circuit low check engine light is perhaps the most troubling of lights because it could mean so many different things, from you didn't screw the gas cap on tightly enough to look out for pistons flying through the hood and into the stratosphere. The easiest way to find out what this light is telling you is to hook your vehicle up to a scan tool. P1985 error code diagnostic tool looks a little like an oversized calculator and plugs into a communication port inside the car. After you instruct it to perform the scan, it speaks exhaust gas recirculation sensor a circuit low with your car's computers to find out exactly what's prompting the light to turn on.

Common Causes of Holden Vc P1985 OBD2 Code

A common cause of code P1985 is the failure of Exhaust Gas Recirculation Sensor A Circuit Low, but there are several other possible causes as well, such as ;

Dirty Oil
Engine Control Module (ECM)
Faulty variable valve timing (VVT)
Incorrect Positive Crankcase Ventilation (PCV) hose connection

P1985 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.

About Us | Contact | Privacy

P1985 Holden Vc OBD Code

P1985 Holden Vc Error Code Repair Process :

Common Causes of Holden Vc P1985 OBD2 Code

P1985 code for other Holden cars