P0451 GMC – Fuel Tank Pressure Sensor Performance

 

P0451: DIY Repairing Video Tutorial

https://youtu.be/Kj7MQbCh4UA

Check out nonda Auto DIY Center for more engine error code repairing videos.
https://www.youtube.com/playlist?list=PL-Lyko0O0oxHe1AGvzwAz-wokJPXAtW97

 

P0451 GMC Possible Symptoms

  Engine Light ON (or Service Engine Soon Warning Light)  

P0451 GMC Possible Causes

  Faulty Fuel Tank Pressure (FTP) Sensor,Fuel Tank Pressure (FTP) Sensor harness is open or shorted,Fuel Tank Pressure (FTP) Sensor circuit poor electrical connection  

P0451 GMC Description

  The Evaporative Emission (EVAP) system is used to store fuel vapors in order to reduce the amount of fuel vapors into the atmosphere. The Fuel Tank Pressure (FTP) sensor is only used for EVAP system diagnostics. The FTP sensor is a transducer that varies resistance according to changes in the fuel tank pressure. The Engine Control Module (ECM) monitors the FTP sensor signal in order to detect vacuum decay and excess vacuum during the EVAP system diagnostic test. The ECM supplies a 5-volt reference and a low reference circuit to the FTP sensor.