U0121: Lost Communication With Abs Module. The U0121 fault code indicates a communication problem with the Anti-Lock Brake System (ABS) Control Module. The ABS Control Module sends periodic messages to the Controller Area Network (CAN) bus. If the CAN bus does not receive these messages, the U0121 code is set.

The U0121 GMC code indicates that there is a communication problem between the vehicle's engine control module (ECM) and the electronic brake control module (EBCM). This communication is crucial for the proper functioning of the vehicle's brake system.

2020年6月29日 · Code U0121 GMC Description. 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 …

How to fix U0121 Code: Lost Communication with Anti-Lock Braking System (ABS) Module A U0121 means that the vehicle CAN Bus can’t communicate with the Anti-Lock Braking System (ABS) Module. The...

The U0121 code stands for “Lost Communication With Anti-Lock Braking System (ABS) Module.” Some issues that could trigger the code include a dead battery, a faulty ABS control module, and CAN bus issues. It’s best to let a professional resolve this code instead of …

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.

2023年11月22日 · When you see the U0121 code, it means your car’s computer can’t talk to the part that controls the anti-lock brakes. This could affect how your car brakes, especially in emergency situations. To fix it, a mechanic will check the wires and connections going to the brake system, ensure the brake system’s computer is working right, and make ...

2022年8月1日 · I have a mid-grade scanner that reads the Electronic Brake Control (ABS) and power steering modules showing no codes on the ABS module, but on the Power Steering module there's a persistent U0121 (lost communication with EBCM) code. As soon as I clear it, it comes right back.

2022年8月1日 · According to various sites, this U0121 code can be caused by a bad EBCM ground, a corroded connector by the gas tank or a problem with the CAN wiring. Before I start dismantling everything and spending hours probing circuits, I was wondering if anyone had a similar issue and how they solved it.

Code U0121 stands for Lost Communication with Anti-lock Brake System Module. Anti-lock brakes are required on all modern vehicles. The antilock braking system (ABS) prevents wheel lockup by modulating the brakes in an emergency situation.