Tesla Model S
U0121
Error code U0121 in a Tesla Model S (2012-2020) indicates a communication issue between the vehicle's electronic control units (ECUs), specifically that the powertrain control module (PCM) has lost communication with the anti-lock brake system (ABS) module.
4 SolutionsU-CodeNetwork
U
Error Code Type
Network
Components
3 affected
BrakesElectricalSteering
Symptoms
10 common
- •Check engine light illuminated
- •Loss of braking assistance or ABS functionality
- •Inconsistent brake pedal feel
- +7 more
Most Affected Generations
1 generation
Plaid
4
Top Affected Components
3 components
Electrical
2
Brakes
1
Steering
1
Severity Levels
1 level
high
4
Quick Facts
4
Total Solutions
3
Affected Components
10
Common Symptoms
1
Generations
All Solutions
Showing 4 of 4 solutions for error code U0121 across all generations.