U0121 Code Meaning, Causes, Symptoms & Tech Notes
Sep 6, 2024 · When a vehicle's onboard computer system detects the U0121 code, it means that there is a communication problem between the Engine Control Module (ECM) and the Anti-Lock Brake …
U0121 Code? Here’s How to Fix It – Quickly and Easily
Nov 1, 2024 · Unlock the secrets to swiftly fixing the U0121 error code and ensure your vehicle's safety—find out more inside!
Trouble code U0121 Fix: Problem with ABS Control Module
May 6, 2025 · In this detailed U0121 code fix guide, we’ll cover everything you need to know—from what the code means and its symptoms to causes, diagnosis, common mistakes, and step-by-step solutions.
U0121 Lost Communication With Anti-Lock Brake System (ABS) …
This code is concerned with the communications circuit between the Anti-Lock Brake (ABS) control module and other control modules on the vehicle. This communications circuit is most often referred …
U0121 Code – What Does It Mean & How To Fix It - OBD2PROS
In conclusion, the U0121 code is a communication error between the ABS Control Module and other control modules on the vehicle. It may be caused by a faulty ABS Control Module, wiring harness, or …
U0121 Code Symptoms, Causes, Diagnosis and Repair Steps Guide
U0121 = Lost communication with ABS Control Module A; ABS light stays on and anti‑lock function may be unavailable. Common triggers: corroded connectors, damaged wiring, blown fuse, power‑supply …
U0121-Data bus: anti-lock brake system (ABS) control module - no ...
When U0121 is present, your vehicle may show one or several clear warning signs. These symptoms range from dashboard alerts to noticeable changes in braking or stability behavior. In some cases, …
u0121 Code - Lost Communication With Anti-Lock Brake System (ABS ...
Code U0121 is a diagnostic trouble code affecting your anti-lock braking system. Here's all you need to know about dealing with this communication error.
U0121 Code: Lost Communication With Anti-Lock Braking System …
Jan 24, 2024 · 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 …
U0121 Trouble Code: Meaning, Symptoms, Causes & Fixes
May 21, 2024 · If you’re seeing the U0121 trouble code, you’re likely experiencing issues with your car’s communication system. This guide will explain what it means, its symptoms, causes, and how to fix it.