U0971 Volvo 460 OBD Code

OBD/2 U0971 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.

U0971 Volvo 460 Error Code Repair Process :

When you turn on the ignition, the Service Engine Soon or Check Engine U0971 light should flash briefly, indicating that the OBD system is ready to scan your vehicle for any malfunctions. After this brief flash, the light should stay off while you drive as long as no problems are detected. If imrc input error (bank 2) so, you'll be glad to know that your vehicle is equipped with an early warning system that could save you time, money, and fuel in addition to helping protect the imrc input error (bank 2).

Common Causes of Volvo 460 U0971 OBD2 Code

A common cause of code U0971 is the failure of IMRC Input Error (Bank 2), but there are several other possible causes as well, such as ;

Dirty Oil
Clogged or faulty fuel injector (s)
Faulty TCM or TCM programming
Faulty Mass Air Flow (MAF) sensor

U0971 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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U0971 Volvo 460 OBD Code

U0971 Volvo 460 Error Code Repair Process :

Common Causes of Volvo 460 U0971 OBD2 Code

U0971 code for other Volvo cars