2007 GMC 5.3L Engine P0171 and P0174 Fault: First Crank Failure Resolution
I've searched extensively in the forums but haven't found a solution for my 2007 GMC 5.3L V8 truck. The vehicle fails to start on the first crank attempt, taking approximately 5 seconds before it successfully starts on the second try. Once running, the engine operates smoothly without idle issues or stalling—unlike some other reported cases. I'm currently experiencing only a starting delay during the initial key cycle. Given that the OBD2 codes P0171 and P0174 are present, I suspect insufficient fuel pressure during the first ignition attempt may be causing this behavior. Any insights or troubleshooting steps would be greatly appreciated.
Based on the vehicle being a GM model and the presence of P0171 and P0174 codes, it's likely that your engine lacks sufficient fuel pressure during the first key cycle, preventing proper startup. I recommend checking the fuel pressure to confirm this issue and ensure the system is delivering adequate flow at ignition.