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What is the P1450 code? Know everything about it! 

  • Cars Explained
  • Gerard Stevens
  • 6 minutes

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The powertrain control module (PCM) in your car keeps track of the fuel vapor and pressure in the tank. So, what happens when PCM senses an excessive vacuum in your car’s fuel tank or Evaporative Emissions Control System (EVAP)? It activates the P1450 code. 

The system starts malfunctioning when the EVAP system’s operating loss monitor detects excessive fuel tank vacuum while the engine is running. Diagnostic Trouble Code (DTC) P1450 is one of the frequent OBD II trouble codes. It is a manufacturer-defined one that applies to specific manufacturers like Ford, Jaguar, Mercedes, BMW, and others. The definition varies from model to model. However, irrespective of the definition of the manufacturer, the causes, effects, and remedies are the same. 

So, what causes the P1450 code to activate in your car? What are the symptoms? How serious is the code? Here’s every info you need on this DTC! 

What does code P1450 mean?  

P1450 code is a manufacturer-specific code defined by Ford as ‘Unable To Bleed Up Fuel Tank Vacuum.’ Carmakers like Mercedes, Jaguar, Lincoln, Mercury, and Oldsmobile defines the code as ‘Inability of Evaporative Emission Control System to Bleed Fuel Tank,’ which is the same as Ford’s definition. 

When the PCM detects an excessive vacuum in the fuel tank and/or EVAP system on these cars, code P1450 activates. In these definitions, ‘bleeding’ denotes the PCM’s incapability to maintain a specified vacuum in the EVAP system only while the engine is spinning faster than idling RPMs. The EVAP stops gasoline vapors from the fuel tank and injection system from getting released into the atmosphere. 

Error P1450 displays and the check engine light turns on when the high vacuum is maintained above 60 seconds. 

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What can cause the P1450 code? 

There are various causes for this error code to activate. The majority of these links to your vehicle’s EVAP system. Below listed are some factors that can lead to this DTC. 

  • Obstruction of EVAP canister or vent solenoid 
  • Fuel vapor transfer from the fuel tank to the EVAP slows down due to a faulty connection hose 
  • A defective or malfunctioning fuel tank pressure sensor 
  • Obstruction of vacuum relief due to a jammed fuel filter cap 
  • Presence of defective, corroded, or shorted wiring and connectors 
  • Charcoal canister gets defective due to overfilling of the fuel tank 

What are the symptoms of the P1450 code? 


The P1450 code has only a few symptoms associated with it. And unlike some other OBD-II codes, these symptoms do not threaten the car’s drivability; instead, they register the mistake in the vehicle’s memory. These are the most common symptoms you can observe when the code shows up. 

  • The check engine light turns on. 
  • In rare circumstances, a delay in engine start-up time after filling the tank. 

How serious is the P1450 code? 

The P1450 error code is not major because it does not cause drivability problems or cause further engine damage when used frequently. But, it’s critical to examine your car as soon as the check engine light turns on. Aside from causing your check engine light to turn on, this error code could cause an uncontrolled release of hydrocarbons into the atmosphere, resulting in a failed emissions test. 

Can you drive with a P1450 code? 

A P1450 DTC does not indicate that the car has any imminent mechanical issues or is unsafe to drive. However, it’s critical to receive a proper diagnosis from a skilled mechanic and make any necessary repairs to avoid further damage to your car. 

How to diagnose P1450 code 

Diagnosing OBD-II issues can be technical and challenging for amateurs. So, it is always better to diagnose the code by certified and experienced mechanics. Skilled mechanics start diagnosing the code by examining for blockage in the EVAP canister or vent solenoid. The mechanics will then check the pipe connecting the canister to the fuel tank for signs of kinks or collapsed hoses that could block the passage. They’ll then look to see if the fuel filler lid is closed. Then they will examine the Fuel Tank Pressure Sensor. 

The hose and Fuel Tank Pressure Sensor need replacement if it is faulty. After these steps, the mechanic will clear the code and check for the P1450 code again. If the code appears again, proceed to download and read freeze frame data on the PCM.  

Steps to follow then 

  • Visually examine all EVAP wiring, connectors, hoses, and fuel lines. 
  • Tighten loose EVAP connections and replace broken parts. 
  • Test the valves’ control unit circuit for ground connectivity, resistance, and continuity if the fault remains after replacing all EVAP components. 
  • Refer to the car’s handbook, compare the readings, and repair or replace damaged parts. 
  • Use the OBD-II scanner’s control feature to verify if the vent valve is open. 
  • If the vent seems good after the scan, there may be a blockage in the vent valve’s connecting tubes. 
  • Remove or replace the connecting tube if it is blocked. 
  • If the problem continues, check the charcoal canister for damage. Replace the canister if water, fuel, or charcoal grains fall off while shaking it. 
  • If the canister and vent valve aren’t defective, remove all vacuum hoses between the canister and fuel tank that links to EVAP. Check for blockages and leaks in the hoses and clean or replace them. 
  • Clear the P1450 code and retest to see if the error persists. 

Common mistakes that happen while diagnosing the code 

  • Mechanics commonly make the error of not inspecting the EVAP system, charcoal canister, and/or gasoline tank while troubleshooting P1450. 
  • In most situations, they can fix the code by cleaning the system or clearing the connected hoses. 

How difficult is it to examine a P1450 code? 

Your mechanic may have to repair or replace the fuel filler cap always. In some cases, a mechanic may need to repair or replace broken or disconnected EVAP lines. Your mechanic will also inspect the electrical components to ensure they are properly connected. 

How do I fix the engine code P1450? 

You can do some straightforward repairs on your car to fix the P1450 code. Follow these to fix the engine code error. 

  • Repair or replace the fuel filler tube. 
  • Remove blockages from the EVAP system’s hoses. Replace the hoses if removing blockages doesn’t solve the issue.  
  • Replace the charcoal canister. 


How much does it cost to diagnose the P1450 code? 

It almost takes an hour to diagnose the issue. Most shops may charge you $75-$150 per hour for diagnosing the code. The diagnosis time and labor rates differ by region, car manufacturer and model, and even engine type. 

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