Toyota Highlander
U0121
The U0121 error code on a 2020-present Toyota Highlander XU70 indicates a loss of communication with the Anti-lock Brake System (ABS) control module, which can affect vehicle safety and performance.
1 SolutionU-CodeNetwork
U
Error Code Type
Network
Components
1 affected
Brakes
Symptoms
5 common
- •Check engine light illuminated
- •ABS warning light on the dashboard
- •Erratic brake performance
- +2 more
Most Affected Generations
1 generation
XU70
1
Top Affected Components
1 component
Brakes
1
Severity Levels
1 level
critical
1
Quick Facts
1
Total Solutions
1
Affected Components
5
Common Symptoms
1
Generations
All Solutions
Showing 1 of 1 solution for error code U0121 across all generations.
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