On a 2007 Chevrolet Cobalt RS model, I got the engine code P0451. What is the problem?

Question

On a 2007 Chevrolet Cobalt RS 2.2L model, I got the engine code P0451. What is the problem?

Answer 1

HI there,

This Code indicates that the Evaporative Pressure Sensor is indicating pressure change values that are not within specification, during the EVAP Monitor test and/or the operation of the vehicle.

This usually indicates a problem with a leak in the evap system or the sensor itself isn't working properly. The system should be checked for leaks prior to replacing the pressure sensor.

Answer 2

P0451 Chevrolet Code - Fuel Tank Pressure Sensor Performance
Read more: https://www.autocodes.com/p0451_chevrolet.html