GMC Sierra
P0430
The P0430 code indicates that the catalytic converter efficiency is below the threshold for Bank 2 in a 2019-present GMC Sierra T1XX. This often points to issues with the exhaust system or the catalytic converter itself.
1 SolutionP-CodePowertrain
P
Error Code Type
Powertrain
Components
1 affected
Exhaust System
Symptoms
6 common
- •Check engine light illuminated
- •Decreased fuel efficiency
- •Rough idling or stalling
- +3 more
Most Affected Generations
1 generation
T1XX
1
Top Affected Components
1 component
Exhaust System
1
Severity Levels
1 level
high
1
Quick Facts
1
Total Solutions
1
Affected Components
6
Common Symptoms
1
Generations
All Solutions
Showing 1 of 1 solution for error code P0430 across all generations.