GMC Sierra
P0456
The GMC Sierra T1XX (2019-Present) has illuminated the check engine light, and the diagnostic trouble code (DTC) P0456 indicates a small leak in the evaporative emissions control system (EVAP).
1 SolutionP-CodePowertrain
P
Error Code Type
Powertrain
Components
1 affected
Fuel System
Symptoms
5 common
- •Check engine light illuminated
- •Reduced fuel efficiency
- •Strong fuel smell near the vehicle
- +2 more
Most Affected Generations
1 generation
T1XX
1
Top Affected Components
1 component
Fuel System
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 P0456 across all generations.