U3989 Trouble Code

View U3989 obd/2 error code description and symptoms. U3989 engine photo

The Camshaft Position sensor will signal the Engine Control Module when the #1 cylinder is ready for the spark plug to fire (top-dead-center on compression stroke). The ECM uses the information from this sensor to help calculate fuel delivery and spark timing.

On some transmissions, such as automated manual transmissions or automatic transmissions with manual mode, the GSP switch lets the TCM know whether or not the driver has selected automatic or manual function. On manual transmissions, the GSP switch informs the TCM which gear the driver is selecting, and may function as a neutral safety switch, depending on system design. The TCM also uses the gate select position switch to monitor transmission operation. For example, if the driver selects manual mode and selects 3rd gear on an automatic transmission, the TCM may monitor speed sensors to detect clutch and brake slippage.

U3989 Error Code Repair Process :

When you turn on the ignition, the Service Engine Soon or Check Engine U3989 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 air temperature internal sensor circuit short to ground 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 air temperature internal sensor circuit short to ground.

U3989 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.

Common Causes of U3989

A common cause of code U3989 is the failure of Air Temperature Internal Sensor Circuit Short To Ground, but there are several other possible causes as well, such as ;

Clogged or faulty fuel injector (s)
Faulty Fuel injector
Faulty Variable Camshaft Timing (VCT) position solenoid
Open VPWR circuit

U3989 code for all cars

You can view according U3989 DTC for your car model. We selected several models to see obd2 solutions click and view it.

+U3989 Bentley Hunaudieres

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