P1450 Code: Meaning, Symptoms, Causes, (& How to Fix It)

The evaporative emission control (EVAP) system is most commonly used in modern vehicles. This system is used to prevent the escaping of the fuel vapors from the fuel system into the environment. Your vehicle’s powertrain control module (PCM) monitors the performance of the EVAP system. When it detects an excessive vacuum in the EVAP system, it triggers the P1450 code. This article mainly explains the P1450 code meaning, causes, and symptoms.

P1450 Code Definition

P1450 code stands for “Unable to bleed up fuel tank vacuum (Ford, Mercury).”

  • Ford P1450: Unable to Bleed Up Fuel Tank Vacuum (Ford)
  • Kia P1450: Evaporative Emission Canister Purge System Vacuum Leak Detected (Kia)
  • Mercedes, Jaguar, Oldsmobile, Lincoln, Mercury P1450: Inability of Evaporative Emission Control System to Bleed Fuel Tank

What Does the P1450 Code Mean?

The powertrain control module (PCM) triggers the P1450 code when it detects an excessive vacuum in the EVAP system or fuel tank. When an excessive vacuum is detected in the EVAP system, your PCM can’t bleed the vacuum to ensure proper pressure.

P1450 code

“Bleeding” means that the PCM is unable to maintain a certain amount of vacuum in the EVAP system only when the engine speed is above idle speed.

The Evaporative Emissions Control (EVAP) system of your vehicle stops the fuel vapors from going into the environment and stores them to combust in the combustion chamber. It temporarily stores the trapped vapors in a charcoal canister until the PCM begins releasing the stored vapors through a purge valve into the engine vacuum. Additionally, the vent valve is connected to the EVAP system. This valve permits fresh air entry into the EVAP system as the stored fuel vapors are discharged.

The vent valves usually remain open to release the stored vapors efficiently. However, the purge valve generally remains closed. These valves open and close when they get commanded by the PCM to release the stored vapors from the EVAP system.

However, if an issue occurs and your vent valve remains closed, the air entering the charcoal canister and the vent valve will be blocked, restricting air entry in the EVAP system and creating a vacuum above the specified limit when the purge valve is opened to release the vapor.

Symptoms of P1450 Code

  • Check engine light turns on 
  • In some cases, hard to start the engine after filling the fuel tank. 

Causes of P1450 Code

  • Faulty EVAP purge valve
  • A damaged connection hose slowing the fuel vapor transfer from the tank to the EVAP
  • Damaged or leaked fuel cap
  • Blocked EVAP canister or EVAP purge control solenoid
  • Damaged or corroded wiring or connectors to the EVAP system
  • Bad charcoal canister
  • Damaged fuel filler neck

How to diagnose P1450 Code 

  • Verify the existence of the P1450 code by using a scan tool. Collect the freeze data and analyze it to find the main issue.
  • Properly examine all the hoses, connectors, and wiring to the EVAP system.
  • Inspect the fuel lines for leaks or blockage.
  • Inspect the EVAP connections.
  • Check the valves’ control unit circuit for ground connectivity, continuity, and resistance if the code still exists after replacing all EVAP parts. 
  • Inspect the vent valve for damage or blockage.
  • Inspect the vent valve’s connecting tubes for a blockage. 
  • Properly examine the charcoal canister for damage. You should change the canister if charcoal grains, fuel, or waterfall off while shaking it.
  • Remove all vacuum hoses between the fuel tank and canister connected to the EVAP system and inspect them for a blockage or leakage.
  • Check the fuel tank cap for a leak or damage.
  • Inspect the fuel tank pressure sensor for a fault.
  • Inspect the purge control valve for damage.
  • Check the powertrain control module (PCM) of your vehicle for a fault.

Common P1450 Code Diagnostic Mistakes

  • Replacing the EVAP system or its parts without inspecting the wiring, connectors, or fuel filters.
  • Not clearing the memory of the PCM after fixing the P1450 code.
  • Changing the unnecessary parts.

How much does it cost to fix P1450 Code?

To fix the P1450 code, you need to repair one or more below given parts. The costs of these parts vary according to the labor cost and your area.

EVAP purge control valve replacement$90 to $320  
Fuel filler tube replacement$190 to $560
Hoses replacement$70 to $660
Unblock EVAP system hoses$40 to $550

FAQ Section

How Serious is the P1450 Code?

The P1450 DTC is not a serious problem. This code does not cause drivability issues. However, you can drive your vehicle comfortably with this code. Driving is completely safe as there are no mechanical issues to overwhelm you.

However, it is important to have the vehicle checked as the check engine light starts to illuminate. In addition to illuminating the check engine light, this trouble code can also cause the uncontrolled release of exhaust gases into the atmosphere, which can cause emissions tests to fail.

What repairs can fix P1450?

  • Cleaning the EVAP system hoses
  • Replacing the bad purge control valve
  • Replacing the defective charcoal canister
  • Replacing the fuel filter tube
  • Replacing the damaged hoses
  • Fixing the damaged EVAP wiring and connectors
  • Reprograming the PCM
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