Help Engine Code - P01450
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Senior Member
Joined: Sep 1999
Posts: 113
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From: Appleton, WI
Help Engine Code - P01450
My CE light came on yesterday morning on my way to work. It was a cooler morning than we have had all summer. I had Autozone read the code, 2 codes both were P01450. I cannot find the code list in my factory service cd anywhere. Anyone know off hand what these codes are under in the FSM CD's and Also what the code may mean. The truck is not running any different than it did for the whole summer. Thank you very much in advance
Silver Bullet
Silver Bullet
Senior Member
Joined: Sep 2002
Posts: 557
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From: Canada
P1450
Continuous Memory Diagnostic Trouble Code (DTC) P0446 or P1450 indicates that Self-Test has detected the Evaporative Emission Control System has excessive fuel tank vacuum.
Possible causes:
EVAP canister purge outlet tube (EVAP canister purge valve to EVAP canister) blockages or kinks.
EVAP canister tube (fuel tank to EVAP canister) blockages or kinks.
Fuel vapor elbow on EVAP canister contaminated.
Restricted EVAP canister.
Canister vent (CV) solenoid stuck closed (partially or fully).
Plugged or contaminated CV solenoid filter.
EVAP canister purge valve stuck open.
Fuel filler cap stuck closed (no vacuum relief).
VREF circuit open in fuel tank pressure (FTP) sensor.
Damaged FTP sensor.
Possible causes:
EVAP canister purge outlet tube (EVAP canister purge valve to EVAP canister) blockages or kinks.
EVAP canister tube (fuel tank to EVAP canister) blockages or kinks.
Fuel vapor elbow on EVAP canister contaminated.
Restricted EVAP canister.
Canister vent (CV) solenoid stuck closed (partially or fully).
Plugged or contaminated CV solenoid filter.
EVAP canister purge valve stuck open.
Fuel filler cap stuck closed (no vacuum relief).
VREF circuit open in fuel tank pressure (FTP) sensor.
Damaged FTP sensor.
