B3979 Subaru Impreza 3 OBD Code

OBD/2 B3979 error code description and symptoms.

Vehicle Speed Sensor (VSS) Intermittent Indicates the powertrain control module (PCM) detected an error in the vehicle speed information. Vehicle speed data is received from either the vehicle speed sensor (VSS), transfer case speed sensor (TCSS), anti-lock brake system (ABS) control module, generic electronic module (GEM), or central timer module (CTM). This DTC is set the same way as B3979. However, it is intended to flash the transmission control indicator lamp (TCIL) for first time VSS circuit error/malfunctions. Refer to possible causes for B3979

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.

B3979 Subaru Impreza 3 Error Code Repair Process :

If your door handle switch circuit open 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 B3979 and engine control unit are in charge of monitoring a bunch of different door handle switch circuit open, and if they get a reading that's a little out of whack, up pops the check engine light.

Common Causes of Subaru Impreza 3 B3979 OBD2 Code

A common cause of code B3979 is the failure of Door Handle Switch Circuit Open, but there are several other possible causes as well, such as ;

EVAP system hose leaking
Faulty ignition coil (s)
Fuel Injectors circuit poor electrical connection
Open or short in the CMP sensor circuits

B3979 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.

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

About Us | Contact | Privacy

B3979 Subaru Impreza 3 OBD Code

B3979 Subaru Impreza 3 Error Code Repair Process :

Common Causes of Subaru Impreza 3 B3979 OBD2 Code

B3979 code for other Subaru cars