Possible causes – Blocked EVAP canister or vent solenoid– Kinked or collasped hose between canister and fuel tank– Failed fuel tank pressure (FTP) sensor– Fuel filler cap stuck closed, preventing vacuum relief When is the code detected? Engine Control module
Possible causes Blockages or kinks in the EVAP canister tube or EVAP canister purge outlet tube (between the fuel tank, EVAP the canister purge valve and the EVAP canister). Fuel filler cap stuck closed (no vacuum relief). Contaminated fuel vapor
P1450 GMC – Barometric Pressure Sensor Circuit
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P1450 BUICK – Barometric Pressure Sensor Circuit