P0452 Chevrolet -

Question

Did an emission test today and failed. Had my truck 12 years and no problems. I had been smelling gas on and off and got my fuel pump replaced. Truck is riding great so I'm wondering what could it be. Please help

Answer 1

P0452 Evaporative emission control system pressure sensor low

Smelling fuel and having this code condition you would likely have two separate problem, One is the fuel tank pressure sensor is not working properly, A working fuel tank pressure sensor would determine EVAP leak condition a set a either a small evap leak or a large evap leak dealing with the fuel tank pressure, With a working fuel tank pressure

​ The fuel tank pressure sensor is part of the fuel pump module, If the fuel pump was recently replace a reinspection of having the fuel tank pressure sensor reinspected as well as fuel smell.