Error Code P1450 is defined as Unable to Bleed Up Bleed Fuel Tank Vacuum.

This error code is a manufacturer-specific trouble code, meaning it does not apply to all vehicles makes. Rather, it applies only to specific vehicle makes, such as Ford. Specification of the definition, troubleshooting, and repairs still vary from one make and model to another.


The PCM (powertrain control module, also known as ECM or engine control module) monitors the fuel tank’s fuel vapor and pressure. System failure happens when the EVAP (evaporative emission) running loss monitor detects excessive fuel tank vacuum with the engine running, but not at idle.

Error Code P1450 is detected when the PCM is running system monitor and detected excessive vacuum in the fuel tank or EVAP system.

Common Symptoms

As with other error codes, this code activates the Check Engine light and registers the code to the vehicle’s memory system. It doesn’t usually come with drivability and performance issues for the vehicle.

Possible Causes

Multiple factors lead to this code, such as:

  • Blocked EVAP canister or vent solenoid
  • Defective Tank Pressure (TP) sensor
  • Collapsed or kinked hose between canister and fuel tank
  • Stuck closed fuel filler cap, preventing vacuum relief

How to Check

Expert technicians diagnose this code by starting their inspection at the EVAP canister or vent solenoid and look for blockage.

Then they proceed to check the hose between the canister and the fuel tank and look for signs of a kinked hose, or a collapsed hose that may block the passage.

Then, they check the fuel filler cap if it’s stuck closed.

Lastly, they check the Fuel Tank Pressure Sensor.

How to Fix

Repairs for this code are pretty simple and straightforward, which starts of course, from a thorough diagnosis.

Repair or replace the fuel filler cap as necessary.

Repair or replace damaged, unhooked, or kinked lines in the EVAP system. Electrical components must be properly hooked up.

If everything seems in good shape, then you may have to take the vehicle to a certified technician. Majority of the tests performed for this code are done with a wide array of diagnostics tools.

Error Code P1450 means the fuel tank is unable to bleed up fuel tank vacuum, and this has nothing to do with the fuel pressure sensor at the engine. The most common cause of this code is simply a defective Fuel Tank Pressure (FTP) sensor).