B0791 Trouble Code

View B0791 obd/2 error code description and symptoms. B0791 engine photo

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.

As the engine heats up and combustion becomes easier and more complete, the PCM will command the idling control valve to increase the amount of air entering the engine to suit the changing conditions. However, when the load on the engine changes, say, when some electrical consumers or other systems are either turned on or off, the PCM adapts the signal voltage to the idle control valve to ensure that the idling speed remains stable, and at the RPM specified by the manufacturer.

B0791 Error Code Repair Process :

When you turn on the ignition, the Service Engine Soon or Check Engine B0791 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 speed control command switch out of range high 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 speed control command switch out of range high.

B0791 is a kind of Body Trouble Code

Auto body problems aren't always easy to spot. Diagnosing auto body problems sometimes requires a little know-how. In this section you'll find articles dedicated to teaching you how to diagnose auto body problems.

Common Causes of B0791

A common cause of code B0791 is the failure of Speed Control Command Switch Out of Range High, but there are several other possible causes as well, such as ;

Dirty Oil
Faulty front heated oxygen sensor
Fuel injectors may be faulty
Faulty oil control valve (OCV)

B0791 code for all cars

You can view according B0791 DTC for your car model. We selected several models to see obd2 solutions click and view it.

+B0791 Kia Picanto

+B0791 Honda Thats

+B0791 Maserati Racing

+B0791 Fiat Twelve

+B0791 Lamborghini Gallardo Lp560

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

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