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I have a 1999 Chevy Tahoe. I have a code that just came up p0452. how can I fix the problem? I changed gas cap.

Answers from the Automotive Experts

Barb Petrey, President - DBK Enterprises Inc at Jiffy Lube There are a number of emissions related items associated with the code. To change items without knowing which one is foolish. See a specialist.

Gelina Aquilina, Service Advisor / Mechanic at May be a fuel tank pressure sensor. Try & find a shop that will check the codes in the computer as well as give you a diagnosis & estimate for free.

Helaine Kurot, Owner/Technician at 360 Automotive P0452 is a code for the evap pressure sensor/switch circuit voltage being lower than it should be. This sensor/switch is on top of the gas tank. However, please note that the code definition does not necessarily mean that the sensor is at fault. The code states that the computer is not seeing the voltage it should be seeing. This could be from a faulty sensor, a broken wire, or a software glitch. This code should be properly diagnosed with scan tool capable of displaying the appropriate data and that data verified with a DVOM or lab scope.

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