Posts Tagged: fuel pump control module

Understanding the P129F or P023F Code

Learn The Common Symptoms and Causes of P129F or P023F Codes in GM Vehicles Quick Summary When I see P129F or P023F pop up on a GM vehicle, I know I’m dealing with a fuel system performance issue—specifically related to fuel pump control and fuel pressure delivery. In most cases, these codes indicate a problem with fuel pump flow, the fuel pump control module (FPCM), wiring, or a restricted fuel supply. The fix usually comes down to verifying fuel pressure, checking the control module commands, and inspecting power and ground … Read More