U1256 Proton Perdana OBD Code

OBD/2 U1256 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.

U1256 Proton Perdana Error Code Repair Process :

If your pressure control solenoid c open circuit 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 U1256 and engine control unit are in charge of monitoring a bunch of different pressure control solenoid c open circuit, and if they get a reading that's a little out of whack, up pops the check engine light.

Common Causes of Proton Perdana U1256 OBD2 Code

A common cause of code U1256 is the failure of Pressure Control Solenoid C Open Circuit, but there are several other possible causes as well, such as ;

Dirty Oil
Faulty spark plug (s)
Faulty Camshaft Position Sensor
Open circuits caused by corrosion of electrical connectors.

U1256 is a kind of Network Trouble Code

U-code indicates that engine communication errors and shows lost communication with engine parts.U-Codes are fairly straight forward, given all of the articles and technical publications that have been written regarding these problematic codes. In most cases, it just comes down to identifying the module that isn't communicating with the other modules on the CAN bus line for whatever reason.

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

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U1256 Proton Perdana OBD Code

U1256 Proton Perdana Error Code Repair Process :

Common Causes of Proton Perdana U1256 OBD2 Code

U1256 code for other Proton cars