What does code U0121 mean?
What does code U0121 mean?
What Does Code U0121 Mean? OBD II fault code is defined as “Data bus: anti-lock brake system (ABS) control module – no communication”, and is set when communication between the ABS brake system control module and the PCM (Powertrain Control Module) is lost for a specified time.
Where are the fuse boxes on a 2009 Ford F150?
This 2009 Ford F150 Fuse Box Diagram post shows two fuse boxes; the Battery Junction Box/Power Distribution Box located under the hood and the Smart Junction Box/Passenger Compartment Fuse Panel There’s lots more information on this site for your vehicle.
What does the u0121 code mean on a Ford?
The Powertrain Control Module ( PCM) continuously monitors the Controller Area Network (CAN) for messages from the ABS. The U0121 code sets when the PCM fails to receive the Anti-lock Brake System (ABS) message within the defined amount of time.
What does it mean when your ABS module says u0121?
Code U0121 indicates the ABS module is not receiving or transmitting messages on the CAN bus. Code U0121 is typically caused by one of the following: Sometimes U0121 can pop up intermittently, or it can result from a dead battery.
What causes the u0121 code to be active?
If you can access codes from the ABS module, then the U0121 code is either intermittent or a memory code. If unable to access codes for the ABS module, then the U0121 code that the other modules are setting is active, and the problem is there now. The most common failure is loss of power or ground.
This 2009 Ford F150 Fuse Box Diagram post shows two fuse boxes; the Battery Junction Box/Power Distribution Box located under the hood and the Smart Junction Box/Passenger Compartment Fuse Panel There’s lots more information on this site for your vehicle.
The Powertrain Control Module ( PCM) continuously monitors the Controller Area Network (CAN) for messages from the ABS. The U0121 code sets when the PCM fails to receive the Anti-lock Brake System (ABS) message within the defined amount of time.
Code U0121 indicates the ABS module is not receiving or transmitting messages on the CAN bus. Code U0121 is typically caused by one of the following: Sometimes U0121 can pop up intermittently, or it can result from a dead battery.
If you can access codes from the ABS module, then the U0121 code is either intermittent or a memory code. If unable to access codes for the ABS module, then the U0121 code that the other modules are setting is active, and the problem is there now. The most common failure is loss of power or ground.
