Diagnostic Aids
WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
P0451, P0454
- A restriction in the vent system could prevent fuel vapor pressure from bleeding off fast enough. If the pressure cannot bleed off fast enough a DTC sets.
- Ensure that the fresh air inlet, reference port, or vent of the component is clean, dry, and unobstructed: B150 Fuel Tank Pressure Sensor