P1089 Code: 2024 2500 HD 6.6L diesel pkg

[Big Vic]

New Truck 5k miles throwing P1089 code. Dealer printout: Fuel rail pressure, 

Dealer backed up for 2 weeks. 
Any ideas?  
Best code reader for 2024 GMC Trucks?

Thanks

[Niklasbraun]

Firstly, check for any loose connections or potential fuel leaks around the rail. And take a look at the fuel pressure sensor and the wiring leading to it. If everything looks tight, double-check the fuel pressure using a gauge just to be sure. Also, I’d inspect the fuel filter. A clogged or dirty filter can lead to irregular pressure and trigger such codes. And maybe, have a look at the fuel injectors for any signs of malfunction.

 

As for a code reader, I'd suggest grabbing one from a brand like Autel or Innova.