U3901 Chrysler Viper OBD Code

OBD/2 U3901 error code description and symptoms.

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.

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.

U3901 Chrysler Viper Error Code Repair Process :

The rule of U3901 code when it comes to emissions-related vehicle repair is that any modification that changes the vehicle from a certified configuration to a non-certified configuration is considered tampering: this applies to both vehicle owners and repair facilities and is, therefore, a Federal offense. Replacing a catalyst with a straight pipe is one traditional example of transmission transfer case contact plate power short to ground. Likewise, overriding the OBD U3901 error in system through the use of high-tech defeat devices or non-certified computer chips, for example, would also be considered tampering. The OBD system may, however, be repaired back to its original certified configuration with certified performance chips or appropriate aftermarket parts.

Common Causes of Chrysler Viper U3901 OBD2 Code

A common cause of code U3901 is the failure of Transmission Transfer Case Contact Plate Power Short To Ground, but there are several other possible causes as well, such as ;

Clogged or faulty fuel injector (s)
Camshaft advance mechanism binding (VCT unit)
Dirty Oil
Starting system circuit Dead (Weak) battery

U3901 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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U3901 Chrysler Viper OBD Code

U3901 Chrysler Viper Error Code Repair Process :

Common Causes of Chrysler Viper U3901 OBD2 Code

U3901 code for other Chrysler cars