Ford Explorer
U0121
The error code U0121 on a Ford Explorer Sixth Generation (2020-present) indicates a communication issue between modules, specifically that the Transmission Control Module (TCM) is unable to communicate with the Engine Control Module (ECM).
1 SolutionU-CodeNetwork
U
Error Code Type
Network
Components
1 affected
Electrical
Symptoms
5 common
- •Check engine light illuminated
- •Transmission shifting issues (e.g., hard shifting or slipping)
- •Loss of engine power
- +2 more
Most Affected Generations
1 generation
U625
1
Top Affected Components
1 component
Electrical
1
Severity Levels
1 level
high
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.