U3894 Pontiac G5 OBD Code

OBD/2 U3894 error code description and symptoms.

Catalytic converters must be warm before they can work properly. On a cold start the PCM provides a rich mixture to keep the cold engine running.
All that extra fuel goes into the catalytic converter. But the exhaust isn't very hot, because, ah, the engine is pretty cold. GM has employed several strategies to fire up the catalytic converter quicker and reduce cold start emissions. One way is to use a secondary air pump that pumps outside air directly into the catalytic converter.

As long as the throttle plate remains closed, the idling speed and quality is controlled by the PCM via the idle control valve, and as can be seen from the above it should be clear that idle control on a gasoline engine is a complex affair. For instance, if the engine is started in sub-zero temperatures, the PCM will command the idling control valve to allow less air to enter the engine to enrich the air/fuel mixture to create a condition which is roughly analogous to how chokes worked on carburetted engines to control idling in cold weather.

U3894 Pontiac G5 Error Code Repair Process :

If your transmission transfer case differential lock-up feedback switch circuit failure 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 U3894 and engine control unit are in charge of monitoring a bunch of different transmission transfer case differential lock-up feedback switch circuit failure, and if they get a reading that's a little out of whack, up pops the check engine light.

Common Causes of Pontiac G5 U3894 OBD2 Code

A common cause of code U3894 is the failure of Transmission Transfer Case Differential Lock-Up Feedback Switch Circuit Failure, but there are several other possible causes as well, such as ;

Dirty Oil
Damaged VCT phaser
Insufficient cylinders compression
Faulty Variable Camshaft Timing (VCT) position solenoid

U3894 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.

About Us | Contact | Privacy

U3894 Pontiac G5 OBD Code

U3894 Pontiac G5 Error Code Repair Process :

Common Causes of Pontiac G5 U3894 OBD2 Code

U3894 code for other Pontiac cars