A P1450 error code is an extension of OBD-II code P1. These codes are always displayed as P1XXX. The third numeral in the code sequence identifies where a vehicle’s OBD-II system has run into a problem. The number 4 indicates an issue with a vehicle’s auxiliary emission controls.
This control system senses temperature, vehicle speed, engine RPM, transmission gear, manifold vacuum, and other vehicle parameters.
As it pertains to OBD-II code P1450, your car’s Powertrain Control Module (PCM) has detected a malfunctioning fuel tank vacuum when the engine is on.
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.
“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.
| Parts | Cost |
|---|---|
| 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 |