Engine running rich

[Gconrad]

2020 Silverado HD 6.6L gas 71k miles, keeps throwing P0172&175 code. Fuel trim is way different from one side to the other and high. Truck will sometime stall when pumping the brakes. Service parking brake illuminates when stopped holding the brakes. Loss of power when slowing down to make turns. My mechanic is at a loss, anyone have any suggestions of what maybe causing this?

[newdude]

9 minutes ago, Gconrad said:

2020 Silverado HD 6.6L gas 71k miles, keeps throwing P0172&175 code. Fuel trim is way different from one side to the other and high. Truck will sometime stall when pumping the brakes. Service parking brake illuminates when stopped holding the brakes. Loss of power when slowing down to make turns. My mechanic is at a loss, anyone have any suggestions of what maybe causing this?

 

 

Bad fuel injector or multiple injectors.  Could also be an issue with the high pressure fuel pump but injectors are more likely.  

 

Ideally you should have an injector balance test performed at the dealer with the GM AFIT injector tester.  

Edited December 7, 2023 by newdude