U3879 Chevrolet K-20 OBD Code

OBD/2 U3879 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 U3879. However, it is intended to flash the transmission control indicator lamp (TCIL) for first time VSS circuit error/malfunctions. Refer to possible causes for U3879

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.

U3879 Chevrolet K-20 Error Code Repair Process :

If your transmission 4-wheel drive low clutch relay circuit to ground 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 U3879 and engine control unit are in charge of monitoring a bunch of different transmission 4-wheel drive low clutch relay circuit to ground, and if they get a reading that's a little out of whack, up pops the check engine light.

Common Causes of Chevrolet K-20 U3879 OBD2 Code

A common cause of code U3879 is the failure of Transmission 4-Wheel Drive Low Clutch Relay Circuit To Ground, but there are several other possible causes as well, such as ;

EVAP system hose leaking
EVAP system hose leaking
Fuel injector leaks
Faulty Variable Camshaft Timing (VCT) position solenoid

U3879 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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U3879 Chevrolet K-20 OBD Code

U3879 Chevrolet K-20 Error Code Repair Process :

Common Causes of Chevrolet K-20 U3879 OBD2 Code

U3879 code for other Chevrolet cars