U0121 Code: Lost Communication With Anti-Lock Braking System (ABS) Module
Most modern vehicles are equipped with an anti-lock braking system (ABS). The system prevents the wheels from locking up during emergency braking situations and whenever the roads are slippery. It also reduces the risk of skidding during a panic stop, which helps the driver maintain vehicle control.
The ABS has a control module that relies on the input from the wheel speed sensors to monitor the wheels’ deceleration rates during braking. This module also communicates with other on-board computers over the controller area network (CAN) bus to operate the entire ABS.
If the module is unable to receive and transmit information over the CAN bus, fault code U0121 will be logged by on-board diagnostics.
What Does the U0121 Code Mean?
Fault code U0121 stands for “Lost Communication With Anti-Lock Braking System (ABS) Module.”
The ABS module issues the necessary commands to modulate brake pressure and maintain the correct percentage of tire slip under emergency braking and adverse road surface conditions.
If the module detects that wheel lockup is about to take place, it will command the hydraulic modulator to regulate fluid pressure accordingly. The prompt applies until the hydraulic control reaches its final phase, which is referred to as the pressure increase phase. This means that the maximum master cylinder pressure has been applied to the wheels.
Note: The definition of code U0121 might be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.
What are the Common Causes of the U0121 Code?
- Dead battery
- Faulty ABS control module
- CAN bus issues
- Circuit problems, such as damaged wires or poor connections
What are the Common Symptoms of the U0121 Code?
- Illuminated warning lights
- ABS performance issues
How to Diagnose the U0121 Code
U0121 is a generic powertrain code that can be logged in vehicles with on-board diagnostics (OBD). Although this fault code is common, its steps for diagnosis and repair can vary from one vehicle to another.
If you’re not familiar with the process of diagnosing trouble codes yet, it’s best to have your vehicle checked by a certified mechanic. Otherwise, you can go ahead and do the job yourself.
Check out the video below to get an idea of what the process might involve.
How to Fix the U0121 Code
Without the right tools and know-how, attempting to fix a U0121 code can be difficult. It can even lead to further complications if done incorrectly. So if you’re not confident with your DIY skills yet, it’s a good idea to bring your vehicle to the nearest repair shop and have a certified professional do the repairs for you.
But if you think you can do it, make sure you have everything you need before proceeding. It’s also a good idea to check out vehicle-specific repair information like those from Chilton or an ALLDATA subscription before you start.
The post U0121 Code: Lost Communication With Anti-Lock Braking System (ABS) Module appeared first on In The Garage with CarParts.com.
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