C0791 Trouble Code

View C0791 obd/2 error code description and symptoms. C0791 engine photo

Intake Manifold Runner Control Malfunction (Stuck Open) The IMRC system is monitored for failure during continuous, key ON engine OFF or key ON engine running self-test. The test fails when the signal on the monitor pin is less than an expected calibrated range at closed throttle. IMRC monitor signal circuit shorted to PWR GND or SIG RTN Damaged IMRC actuator Damaged PCM An IMRCM PID reading approximately near 1 volt at closed throttle may indicate a fault.

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.

C0791 Error Code Repair Process :

If your license lamp circuit short to battery 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 C0791 and engine control unit are in charge of monitoring a bunch of different license lamp circuit short to battery, and if they get a reading that's a little out of whack, up pops the check engine light.

C0791 is a kind of Chassis Trouble Code

Diagnosing chassis noises can be one of the most frustrating problems technicians face. Fortunately, manufacturers have engineered noise, vibration and harshness (NVH) diagnostic techniques and equipment to find the source of the noise.

Common Causes of C0791

A common cause of code C0791 is the failure of License Lamp Circuit Short to Battery, but there are several other possible causes as well, such as ;

1Camshaft Position Sensor circuit poor electrical connection
Clogged or faulty fuel injector (s)
Ignition coils circuit poor electrical connection
Starting system circuit Dead (Weak) battery

C0791 code for all cars

You can view according C0791 DTC for your car model. We selected several models to see obd2 solutions click and view it.

+C0791 Mercedes B 160

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

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