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P1450 Code – What Does It Mean & How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.

DTC P1450 is a manufacturer-defined code that applies to specific vehicles such as Ford, Jaguar, Mercedes, etc. Therefore, the definition varies from one model to another, however, the causes, effects, and repairs are the same regardless of the definition or brand of the vehicle.

The P1450 code may have appeared when you were driving and spotted a check engine light. This code is caused by an excessive vacuum in the fuel tank or EVAP system, which can cause a number of problems, such as lower fuel economy and even engine damage. In order to prevent more issues, it is crucial to handle this matter right now.


P1450 is a diagnostic problem code that denotes an issue with the gasoline tank or evaporative emission (EVAP) system.

There is too much vacuum in the system because the powertrain control module (PCM) cannot bleed the vacuum to maintain adequate pressure.

The PCM identifies a failure, the Check Engine Light turns on, and the P1450 code is set in the system if the high vacuum lasts for more than 60 seconds.


The Diagnostic Trouble Code (DTC) P1450 is the error code that is displayed when the evaporative emission (EVAP) running loss monitor detects an inordinate vacuum in the fuel tank when the engine is working. This occurs when the Powertrain Control Module (PCM) fails to maintain a specific vacuum value in the EVAP system and the engine is running at a speed beyond that of the idling RPM (Revolutions per Minute).

The Evaporative Emission Control System (EVAP) functions to capture and store fuel vapors before they escape into the atmosphere. The captured vapors are stored temporarily inside the charcoal canister where they remain until the PCM initiates the discharge of the stored vapor into the engine vacuum through the purge valve. Also, a vent valve is attached to the EVAP system to allow for fresh air into the system when the stored vapor is being discharged.

Normally, the vent valve is expected to remain open for effective discharge of the stored vapor, while the purge valve which normally remains closed, is opened and closed by the command from the PCM for the discharge of vapor from the EVAP system. However, when abnormalities occur and the vent valve is closed, this will block the inlet of air through the vent valve and the charcoal canister, thereby obstructing the airflow in the system, and as a result, a vacuum above the stipulated value is accumulated when the purge valve is opened to discharge the stored vapors.

Error P1450 is displayed and the check engine light is ignited when the high vacuum is maintained above 60 seconds.


The P1450 error code has a number of frequent causes, including:

  • A defective or clogged EVAP canister
  • A faulty EVAP purge valve
  • EVAP hose with cracks or damage
  • The petrol tank pressure sensor is broken
  • A defective or broken PCM

A mechanic will normally read the P1450 code with an OBD-II scanner, check the fuel tank and EVAP system visually, and then determine the reason for the issue. To find any leaks in the system, they could further employ a smoke machine.

The mechanic will carry out the required repairs after determining the source of the error code, which can involve swapping out a defective part, mending a hose that has become frayed, or cleaning or replacing the EVAP canister.

The P1450 error code has to be fixed right away since it might make the car fail an emissions test and affect its performance and fuel economy.


Drivers may see a few symptoms when the P1450 code occurs. Depending on how serious the problem is, these symptoms might vary; however, some of the more typical ones are as follows:

  • The check engine light will come on and remain on until the problem is fixed.
  • Delayed start-up following gas tank refill.
  • Starting the engine is difficult.
  • Reduced fuel efficiency.
  • There is a petroleum smell coming from the car.
  • The car might not pass the emissions test.

It is essential to remember that some of these symptoms can also be brought on by other car problems. As a result, it’s crucial to have the car diagnosed by a skilled mechanic in order to identify the problem’s origin.

Drivers may see performance issues in addition to the symptoms mentioned above. This is due to the P1450 code’s connection to the mechanism that stops gasoline vapors from leaking into the environment, the evaporative emission control system. The car might not be able to perform at its best if this system isn’t working correctly.

In general, it is crucial to have the car checked out by a competent technician as soon as possible if a driver sees any of the symptoms mentioned above in order to prevent additional damage and make sure the car is safe to drive.


The evaporative emission (EVAP) system or fuel tank problem is indicated when a vehicle displays the P1450 code. The method for diagnosing this manufacturer-specific code will depend on the brand and model of the car. However, there are several standard procedures that mechanics might use to identify the problem.

Initial Inspection

The first assessment of the vehicle is the first stage in the P1450 code diagnosis process. The gasoline tank and EVAP system should be visually inspected by the mechanic for any evidence of wear or damage. Additionally, they need to look for any disconnected or dangling hoses or cables in the system.

The next step is for the mechanic to obtain the diagnostic trouble codes (DTCs) from the car’s computer using a scan tool. The mechanic should continue with the P1450 code’s diagnostic if there are no other codes present. However, additional codes that could be connected to the P1450 code should be handled first if they are present.

Advanced Diagnosis

If there are no evident problems after the initial check, the technician should go on to more sophisticated diagnosis procedures. They could check for leaks in the EVAP system using a smoke machine or check the fuel tank pressure using a vacuum gauge.

The EVAP purge valve, which regulates the passage of gasoline vapors from the fuel tank to the engine, should also be checked by the technician. The P1450 error code might emerge due to a broken purge valve.

A clogged EVAP canister is another likely P1450 code reason. The mechanic has to look for any indications of damage or obstruction in the canister.

The P1450 code can occasionally be brought on by a broken fuel tank pressure sensor or a broken PCM. These problems will call for more sophisticated diagnostic methods and maybe part replacement.

Overall, a comprehensive examination of the fuel tank and EVAP system is necessary to diagnose the P1450 error code. Mechanics can find the source of the problem and perform the required fixes to erase the code by using the correct diagnosis procedure.

  • Start the diagnostic process by inspecting the EVAP canister and the vent solenoid for possible blockage in the system;
  • Next, check the hose connecting the fuel tank with the EVAP for possible fault or defect;
  • Should there be any defect in the hose, replace the hose and ensure it is properly connected;
  • Proceed to check if the fuel tank cap is stuck. Fix or replace the cap as appropriate;
  • Inspect the fuel tank pressure sensor and repair or replace if faulty;
  • After completing the steps above, clear the error code and check if the code returns;
  • If the code returns, proceed to download and read freeze frame data on the PCM;
  • Then, conduct a visual inspection on all wirings, connections, hoses, and fuel lines connecting to the EVAP and its components. For the adequacy of this information, use the instructional manual to locate all the components of the EVAP system;
  • Tighten loose connections in the EVAP system and repair or replace any faulty parts;
  • If the error persists after the necessary repairs and replacement of all the EVAP components, or if no visible damage is found, test the valves’ control unit circuit for ground connectivity, resistance, and continuity. Kindly consult the manual guide of the car to do that;
  • Having done that, compare the reading you get with the readings specified in the manual, then repair and replace faulty parts as appropriate;
  • Alternatively, if the OBD-II scanner has a control function, use the scanner command to check if the vent valve is opened. However, this particular scan will only check the openness of the valve;
  • If the vent seems to be working fine after the scan, it probably means there is a blockage in the connecting tubes of the vent valve;
  • If the blockage is detected in the connecting tube, remove the blockage or replace the tube if necessary;
  • If the error persists after the steps above, remove the charcoal canister and inspect for possible damage. A quick way to detect a damaged charcoal canister is by shaking it, if defective, water, fuel, or charcoal granules will fall off during the shake;
  • In this case, the only solution is to replace the canister;
  • Meanwhile, if no fault is detected in the canister and the vent valve, remove all vacuum hoses located in between the canister and the fuel tank that is related to EVAP;
  • Then check for possible blockages and leaks in the hoses and clean or replace them if not sure of their condition;
  • Lastly, clear the P1450 code and conduct another test on the system to see if the error is cleared.

Common Mistakes

Failure to properly inspect all the components, wirings, hoses, and connections of the EVAP system, the charcoal canister, and/or the fuel tank is a common mistake often made by mechanics during the process of diagnosing P1450. 

In most cases, it is possible to fix the code by simply cleaning the system or removing the blockage within the connecting hoses instead of part replacement.

How Serious Is P1450?

The P1450 error code is not a serious error code as it does not have any drivability issue or cause further damage to the vehicle’s engine through persistent use. Nevertheless, it is not advisable to leave OBD-II errors in your vehicle without being fixed.

What Repair Can Fix P1450?

When the P1450 code arises, it’s crucial to solve the problem right away. Here are a few solutions to the issue.

DIY Fixes

Checking the fuel cap is one of the easiest methods to resolve the P1450 error code. The gasoline cap may be loose or damaged, which can result in the code. If the gasoline cap is damaged, replace it and tighten it up.

Examining the vacuum hoses of the EVAP system for leaks or damage is another do-it-yourself repair. The P1450 error code may emerge if there is a leak. Any leaks or broken hoses should be fixed.

Professional Repair

It is important to seek expert assistance if the DIY remedies do not work. A diagnostic tool can be used by a technician to find the issue and make the required repairs.

A damaged EVAP canister is one of the most typical reasons of the P1450 error code. The canister may be changed and the code cleared by a mechanic.

A damaged gasoline tank pressure sensor is a different possible problem. The sensor may be changed and the code erased by a technician.

It’s vital to remember that ignoring the P1450 code may cause the car to experience worse issues. As a result, it is imperative to treat the problem right away and, if required, seek expert assistance.

In general, resolving the P1450 error involves close attention to detail and the readiness to seek out expert assistance if required. Drivers may solve the problem and prevent additional issues with their vehicles by using DIY repairs and consulting a professional when necessary.

Preventive Measures

There are a number of precautions one may take to prevent experiencing the P1450 code. The following are some recommendations to remember:

  • Regular vehicle maintenance: Preventing the P1450 error code with routine vehicle maintenance This involves inspecting the EVAP system and replacing any worn-out or broken components.
  • Fuel quality: Poor fuel might result in an EVAP system malfunction and the P1450 error code. To prevent this, it is advised to use high-quality gasoline.
  • Use of the fuel cap properly: The fuel cap is a crucial part of the EVAP system. To avoid the P1450 code, it’s crucial to make sure the gasoline cap is properly fastened after refilling.
  • A P1450 error code may result from overfilling the fuel tank, which might cause the fuel to spill into the EVAP system. It is advised to fill the car according to the manufacturer’s recommendations.
  • The system checks on a regular basis can help locate any possible problems before they result in the P1450 error. This entails looking for any indications of damage or wear on the hoses, canister, and purge valve.

The chance of getting the P1450 code can be decreased by taking these preventative actions. In order to save the car from suffering more harm, it is crucial to correct the code if it does occur.


Conclusively, diagnosing P1450 is not some easy DIY for novices, furthermore, dealing with this error code as well as other OBD-II errors should be done with care by experts to void further complications in the vehicle.

Frequently Asked Questions

How much does it cost to fix code P1450?

The price to remedy a P1450 error code might change based on what caused the issue. In other instances, it could just require a straightforward remedy, such as the $20–$50 replacement of a gasoline filler cap. The price may range from $100 to $500 or more, however, if the problem is more complicated, such as an EVAP vent solenoid or tank pressure sensor that isn’t working properly.

Is it safe to drive with a P1450 code?

Although it is not advisable, driving while having a P1450 code is typically safe. The Evaporative Emission Control (EVAP) or fuel system issue indicated by the code may have an impact on the performance and fuel efficiency of the car. To prevent additional harm to the car, it is preferable to get the problem identified and fixed as soon as possible.

What would cause a P1450 code?

Several problems, such as a clogged EVAP canister, a defective EVAP vent solenoid, a broken tank pressure sensor, or a jammed gasoline filler cap, might result in a P1450 code. Faulty or corroded electrical connections to the EVAP system’s components are another potential reason.

What are the symptoms of the P1450 code?

The check engine light turning on is the primary sign of a P1450 code. Reduced fuel efficiency, diminished engine performance, and trouble starting the car are possible further symptoms.

What causes the code P1450?

Typically, an issue with the fuel system or EVAP (Evaporative Emission Control) causes the P1450 code to appear. The code denotes an excessive amount of vacuum in the fuel tank or system, which the PCM is unable to bleed to maintain adequate pressure.

How do I fix my engine code P1450?

Identifying the underlying source of the issue is the first step in resolving a P1450 error code. The EVAP system’s components may need to be examined, vacuum leaks may need to be found, and the fuel system pressure may need to be tested.

Once the root cause has been found, the necessary repairs may be undertaken, such as swapping out the problematic part or mending the broken connection. To guarantee accurate and secure repairs, it is advised that a qualified technician execute the diagnostics and work.

P1450 Code – What Does It Mean & How To Fix It



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