Suggestions as to what to repair

Question

I am wondering what suggestions you have for repairs. Fuel filter, Injectors, Etc? Thank you

Answer 1

Hi there,

The code P0191 indicates an issue with the fuel rail pressure sensor. Here is a list of causes.

P0191 GMC - Fuel Rail Pressure Sensor Circuit Range/Performance

Read more: https://www.autocodes.com/p0191_gmc.html

The code P12B7 indicates an issue with the fuel injector. Here is a list of possible causes.

P12B7 GMC - Cylinder 3 Injection Timing Related

Read more: https://www.autocodes.com/p12b7_gmc.html