GMC Sierra
P0155
The P0155 code for a GMC Sierra T1XX (2019-Present) indicates a malfunction in the oxygen sensor circuit for Bank 2, Sensor 1. This typically implies that the Engine Control Module (ECM) has detected a problem with the oxygen sensor's heating element or its circuit.
1 SolutionP-CodePowertrain
P
Error Code Type
Powertrain
Components
1 affected
Exhaust System
Symptoms
6 common
- •Check engine light illuminated
- •Poor fuel economy
- •Rough idle
- +3 more
Most Affected Generations
1 generation
T1XX
1
Top Affected Components
1 component
Exhaust 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 P0155 across all generations.