U2939 Mercedes-benz E Class OBD Code

OBD/2 U2939 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 U2939. However, it is intended to flash the transmission control indicator lamp (TCIL) for first time VSS circuit error/malfunctions. Refer to possible causes for U2939

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.

U2939 Mercedes-benz E Class Error Code Repair Process :

If your engine overtemp condition 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 U2939 and engine control unit are in charge of monitoring a bunch of different engine overtemp condition, and if they get a reading that's a little out of whack, up pops the check engine light.

Difficulty Level (Expert)
Level
Repair Time (35 Min.)
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Cost Prediction : $ 40-75

Common Causes of Mercedes-benz E Class U2939 OBD2 Code

A common cause of code U2939 is the failure of Engine Overtemp Condition, but there are several other possible causes as well, such as ;
Wrench Tool U2939 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.

U2939 code for other Mercedes-benz cars

You can view according U2939 DTC for your car model. We selected several models to see obd2 solutions click and view it.

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

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