what does detect vacuum decay or an excessive vacuum during the EVAP diagnostic routine mean? thans

Question

what does detect vacuum decay or an excessive vacuum during the EVAP diagnostic routine mean ? thanks

Answer 1

Hi there

This code is for low voltage to the fuel tank pressure sensor. The sensor reads the pressure in the gas tank and tells the computer to open or close the emissions system based on the pressure. If the sensor has failed you will get this code because the computer doesn't see a change in the pressure. A leak in the evap system can cause this code as well.

P0452 CHEVROLET - Fuel Tank Pressure Sensor Circuit Low Voltage

Read more: https://www.autocodes.com/p0452_chevrolet.html