GMC Sierra
P0303
The P0303 code indicates a misfire in cylinder 3 of a GMC Sierra T1XX (2019-Present). This issue can lead to poor engine performance and increased emissions.
3 SolutionsP-CodePowertrain
P
Error Code Type
Powertrain
Components
1 affected
Engine
Symptoms
10 common
- •Check engine light illuminated
- •Rough idle or engine shaking
- •Loss of power during acceleration
- +7 more
Most Affected Generations
1 generation
T1XX
3
Top Affected Components
1 component
Engine
3
Severity Levels
1 level
high
3
Quick Facts
3
Total Solutions
1
Affected Components
10
Common Symptoms
1
Generations
All Solutions
Showing 3 of 3 solutions for error code P0303 across all generations.