GMC Sierra
P0401
The P0401 code indicates an issue with the Exhaust Gas Recirculation (EGR) system, specifically that insufficient flow has been detected. This problem affects the GMC Sierra T1XX (2019-Present) and can lead to increased emissions and engine performance issues.
2 SolutionsP-CodePowertrain
P
Error Code Type
Powertrain
Components
1 affected
Exhaust System
Symptoms
8 common
- •Check engine light illuminated
- •Rough idle or engine stalling
- •Reduced engine power
- +5 more
Most Affected Generations
1 generation
T1XX
2
Top Affected Components
1 component
Exhaust System
2
Severity Levels
1 level
medium
2
Quick Facts
2
Total Solutions
1
Affected Components
8
Common Symptoms
1
Generations
All Solutions
Showing 2 of 2 solutions for error code P0401 across all generations.