P0954 Volvo 780 OBD Code

OBD/2 P0954 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.

P0954 Volvo 780 Error Code Repair Process :

If your p0954 auto shift manual control circuit intermittent 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 P0954 and engine control unit are in charge of monitoring a bunch of different p0954 auto shift manual control circuit intermittent, and if they get a reading that's a little out of whack, up pops the check engine light.

Common Causes of Volvo 780 P0954 OBD2 Code

A common cause of code P0954 is the failure of P0954 Auto Shift Manual Control Circuit Intermittent, but there are several other possible causes as well, such as ;

Dirty Oil
Damaged ECM
Intake air leaks
Variable Camshaft Timing solenoid stuck open

P0954 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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P0954 Volvo 780 OBD Code

P0954 Volvo 780 Error Code Repair Process :

Common Causes of Volvo 780 P0954 OBD2 Code

P0954 code for other Volvo cars