GMC Sierra
P0128
The P0128 code indicates that the engine coolant temperature is not reaching the specified temperature threshold within a predetermined time frame in a GMC Sierra T1XX (2019-Present).
1 SolutionP-CodePowertrain
P
Error Code Type
Powertrain
Components
1 affected
Cooling System
Symptoms
6 common
- •Check engine light illuminated
- •Engine runs cooler than normal
- •Poor fuel economy
- +3 more
Most Affected Generations
1 generation
T1XX
1
Top Affected Components
1 component
Cooling System
1
Severity Levels
1 level
medium
1
Quick Facts
1
Total Solutions
1
Affected Components
6
Common Symptoms
1
Generations
All Solutions
Showing 1 of 1 solution for error code P0128 across all generations.