Volkswagen Routan U0121 Engine Error Code

When you check Volkswagen Routan car engine light came on code U0121 the reason should be Engine Light ON (or Service Engine Soon Warning Light). However Volkswagen manufacturer may have a different definition for the U0121 OBD-II Diagnostic Network (U) Trouble Code. So you should chech it on our car models.

On 1999 and later U0121 Volkswagen Routan engines, the instrument cluster has a built-in self-diagnostic mode that can be accessed by pressing and holding the instrument cluster SELECT/RESET button. Insert the ignition key and turn to the RUN position (but don't crank or start engine). Continue to press and hold the SELECT/RESET button (for 5 seconds) until the word TEST is displayed by the odometer. Release the SELECT/RESET button within three seconds after the word TEST is displayed to begin the self-diagnostic mode.

Volkswagen Routan U0121 OBD-II Diagnostic Network (U) Trouble Code Description Volkswagen Routan car U0121 OBD-II Trouble Code Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and comm Reason For Volkswagen Routan U0121 Code The reason of Volkswagen Routan U0121 OBD-II Engine Error Code is U0121 Lost Communication With Electronic Brake Control Module.

There are currently two main types of cylinder deactivation used today, depending on the type of engine. U0121 Volkswagen Routan code for the pushrod design which uses solenoids to alter the oil pressure delivered to the lifters. In their collapsed state, the lifters are unable to elevate their companion pushrods under the valve rocker arms, resulting in valves that cannot be actuated and remain closed.

Volkswagen Routan U0121 Possible Solution :

In-line Ford engines, along with those of most other manufacturers, begin the numbering of cylinders at the front and proceed in numerical order toward the back. In the V-engine design, Ford follows a similar design with the number one cylinder at the front left of the engine. In the V-6 configuration, cylinder 4 is at the front right of the engine and in a V-8, cylinder number 5 is in that location. Other manufacturers sometimes use an alternating pattern in the V-engines.

What does fault code U0121 mean for Volkswagen Routan ? What does a diagnostic reading U0121 mean for Volkswagen Routan ? How to fix OBD2 Code U0121 for Volkswagen Routan ? What do we know about U0121 code for Volkswagen Routan ?