GMC Sierra
U0101
The U0101 code indicates a loss of communication with the Transmission Control Module (TCM) in a 2019-present GMC Sierra T1XX. This typically points to issues with wiring, connectors, or the TCM itself.
3 SolutionsU-CodeNetwork
U
Error Code Type
Network
Components
2 affected
TransmissionElectrical
Symptoms
10 common
- •Check engine light illuminated
- •Transmission shifting problems or erratic behavior
- •Loss of power or acceleration issues
- +7 more
Most Affected Generations
1 generation
T1XX
3
Top Affected Components
2 components
Transmission
2
Electrical
1
Severity Levels
1 level
high
3
Quick Facts
3
Total Solutions
2
Affected Components
10
Common Symptoms
1
Generations
All Solutions
Showing 3 of 3 solutions for error code U0101 across all generations.