GMC Sierra
B0404
The GMC Sierra T1XX (2019-Present) is displaying an HVAC B0404 code, indicating a problem related to the HVAC system, specifically the mode door actuator.
1 SolutionB-CodeBody
B
Error Code Type
Body
Components
1 affected
HVAC
Symptoms
5 common
- •HVAC system not switching between different modes
- •Inconsistent airflow direction from vents
- •Unusual noises from the dashboard area when changing settings
- +2 more
Most Affected Generations
1 generation
T1XX
1
Top Affected Components
1 component
HVAC
1
Severity Levels
1 level
medium
1
Quick Facts
1
Total Solutions
1
Affected Components
5
Common Symptoms
1
Generations
All Solutions
Showing 1 of 1 solution for error code B0404 across all generations.