U3998 Trouble Code

View U3998 obd/2 error code description and symptoms. U3998 engine photo

The Transmission Fluid Pressure Switch allows the engine's control module (PCM) or Transmission Control Module (TCM) to use hydraulic fluid to engage the clutches in the transmission to allow for smoother shifting while driving. If the PCM or TCM detects an issue with the hydraulic clutch or the pressure switch, the PCM or TCM will set code U3998

Gear changes are accomplished by a command from the TCM to energize the clutch actuator to release the clutch; after which various actuators inside the transmission disengage the current gear, and depending on current operating conditions, engage the next higher or lower gear ratio. All of this happens much faster than a human driver could change gears, and in most applications, gear changes are as smooth and seamless as on any fully automatic transmission.

U3998 Error Code Repair Process :

The scent may U3998 signal oil or coolant leaking from their normally closed-loop systems, or it may indicate dangerous exhaust gases invading your car's interior. Car and truck exhaust contains toxic gases such U3998, so if the inside of your car servo motor defrost circuit failure as if you were standing behind your car, get out and get it fixed. Fight the urge to take a little nap first. So sleepy. That's the carbon monoxide talking, friends. At least open a window on your way to the shop.

U3998 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 U3998

A common cause of code U3998 is the failure of Servo Motor Defrost Circuit Failure, but there are several other possible causes as well, such as ;

Continuous oil flow to the VCT piston chamber
Engine Control Module (ECM)
Faulty Mass Air Flow (MAF) sensor
Variable Camshaft Timing solenoid stuck open

U3998 code for all cars

You can view according U3998 DTC for your car model. We selected several models to see obd2 solutions click and view it.

+U3998 Elfin Ms

+U3998 Cadillac Biarritz

+U3998 American Underslung Roadster

+U3998 Mazda 626

+U3998 Mitsubishi Dion

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

About Us | Contact | Privacy