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Rock Sam

Rock Sam 5/7/2018

2008 Hummer H3 Base 5 Cyl 3.70L


What does P0452 OBD-II Trouble Code stands for? How do I fix Evaporative Emission Control System Pressure Sensor Low?

1 Answer

Parts avatar

Parts avatar 5/7/2018

What the P0452 code means?

P0452 is an OBD-II generic code for a voltage issue with the EVAP system in that the voltage received by the engine computer from the system is not within the manufacturer's parameters.

What causes the P0452 code?

Failed fuel tank pressure sensor

Harness to the sensor has an open or short circuit

Faulty electrical connection to the FTP sensor

Cracked or broken vapour line to the vacuum canister

Cracked or broken positive vapour line to the tank

Plugged line

What are the symptoms of the P0452 code?

Normally, no symptoms other than a stored code and a service engine soon lamp will be exhibited.
However, other evaporative emission control system codes are likely to be present.

Common mistakes when diagnosing the P0452 code?

Evaporative emission control system components are often replaced in error when a vacuum leak is present
or the fuel cap is not properly tightened.

What repairs can fix the P0452 code?

Tighten the fuel cap

Repair the fuel tank pressure sensor

Repair damaged wiring to the fuel tank pressure sensor


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