What are the symptoms of U0121?

Symptoms of U0121 include: ABS light on, Traction control off, Stability control disabled, Speedometer issues.

To fix U0121, you can try: Check ABS module fuses ($10-$50, beginner); Repair CAN bus wiring to ABS ($150-$500, professional); Replace ABS control module ($500-$1200, professional). Based on 2657 owner reports.

How much does it cost to fix U0121?

The average repair cost for U0121 is $2,433 based on 2657 owner reports. Costs vary depending on the specific repair needed.

U0121High Priority

Lost Communication With Anti-Lock Brake System (ABS) Control Module

Category: Network• CAN Communication

1 articles · 1 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 2,657 real owner discussions • 159 confirmed solutions

Dataset (2,657 records)

$2,433

Average Repair Cost

Success Rate

30%

DIY Repairs

2,657

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.

P0500
2 reports

Based on analysis of 2 owner reports where multiple codes appeared together.

Issues by Vehicle

HONDA

2020 Accord

Fixing 2020 Honda Accord Brake Rattle, Rub, and Vibration

527 sources