U0121High Priority
Lost Communication With Anti-Lock Brake System (ABS) Control Module
Category: Network• CAN Communication
3 articles · 3 makes affected
What is U0121?
Lost Communication with ABS Control Module. The vehicle network cannot communicate with the anti-lock brake system module.
Symptoms You May Notice
- ●ABS light on
- ●Traction control off
- ●Stability control disabled
- ●Speedometer issues
How to Fix It
- ●Check ABS module fuses ($10-$50, beginner)
- ●Repair CAN bus wiring to ABS ($150-$500, professional)
- ●Replace ABS control module ($500-$1200, professional)
Owner Statistics
Based on 33,044 real owner discussions • 1217 confirmed solutions
$792
Average Repair Cost
4%
Success Rate
24%
DIY Repairs
33,044
Data Sources
About This Data
Statistics are aggregated from real owner discussions on Reddit, automotive forums, and YouTube comments. All data is anonymized and represents actual repair experiences reported by vehicle owners.
Frequently Appears With
These codes often appear together in owner reports. Check these if you see U0121.
Based on analysis of 2 owner reports where multiple codes appeared together.