P0441 P0455 Toyota: Causes, Symptoms & Solutions

P0441 P0455 Toyota are two common fault codes that you easily come across. Yet what information do they entail? If you don’t have the foggiest idea about the answer, let our article give you a helping hand. Stay tuned! 

What Do The Error Codes P0441 P0455 Toyota Mean?

The P0441 code indicates the evaporative emission control system’s incorrect purge flow, while the P0455 denotes the gross leakage or evaporative emissions control system malfunction.

More specifically, the DTC P0441 Toyota code will be activated when a powertrain control module (PCM) detects something abnormal with the fuel amount, which is purged into internal engines from the charcoal canister.  

The P0455 code appears when the EVAP system is on the fritz, so it cannot maintain a proper pressure level inside your vehicle. This system captures fuel leaks from the storage and purges them back into the intake manifold through numerous control valves

When these valves get damaged, the fuel vapors still escalate and escape outside, causing an increase in the temperature and pressure. The EVAP system then delivers a signal of a large leakage to the PCM, which will send an alert warning to drivers.

P0441 P0455 Toyota

What Are The Causes Of The P0441 And P0455 Codes?

The P0441 and P0445 codes present great difficulties for mechanics to check and diagnose. However, there are still some common roots, helping detect these trouble codes more easily. Below are some causes that you should pay close attention to: 

Causes Of P0441 

  • A broken purge valve: The P0441 code signals an incorrect flow within the EVAP system and the purge in particular. 
  • Corroded wiring: The PCM cannot connect to the EVAP system without the wiring network, resulting in the open circuit problem and loose connections.
  • Faulty vacuum switch: The vapors cannot move among different engines, thereby hindering the combustion process. 
  • Damage to the EVAP system: The code P0441 indicates some problems with the EVAP system and its relevant parts. 
  • EVAP system’s leakage due to bad hoses: Hoses facilitate the flow of vapors, so when it gets cracked, the leakage scenario will likely arise. 
  • A loosened gas cap: A gas cap, which has not been tightened, supports the gasses to escape more quickly. 
  • Insufficient fuel vapors from the vacuum supply: A low level of gasses can trigger your car’s PCM to show P0441 code.  
  • The short circuit problem: This culprit is rooted in the faulty wiring harness, resulting in a lack of electrical supply.
  • The defective powertrain control module: Suppose the PCM is out of order; it might mistakenly activate the code P0441.
  • The rusting canister: When it is prone to rust, cracks may appear, leading to the fumes leakage.

Causes Of P0455 

  • A leak in the hose: This is normally boiled down to corrosion, aging or cracking. 
  • The broken EVAP system: The P0445 code appears when something is wrong with the EVAP system. 
  • Vent control valves are failed or stuck: They could hinder the escaping flow of pressures, causing them to mount. 
  • Defective purge control valves. They might prevent the free flow of vapors; therefore, the main function of the EVAP system is no longer fulfilled. 
  • Cracks on the surface of the EVAP canister: These cracks might be a main culprit behind some major leaks.  
  • The loosened gas cap: If it is not tightened well, the fumes are apt to vapor, and the EVAP cannot function fully.   
  • A failing powertrain control module: It might encounter an error and activate the P0455 code while your car has no trouble.

What Are The Symptoms Of P0441 And P0455 Codes?

Symptoms Of P0441

  • You can sense the pungent smell from the fuel tank 
  • The check engine light illuminates
  • A slight decrease in the engine performance. 
  • Rough or erratic idling. 

Symptoms Of P0455

  • Intermittent flashing check engine light on the car’s dashboard
  • A noticeable gasoline stink stems from the fuel filler or evaporative lines. 
  • A minor reduction in the gasoline efficiency. 
  • Escalating pressure in your vehicle’s fuel tank.
  • Difficulties related to the fuel filling procedure. 

How To Diagnose The P0441 And P0455 Codes?

The Diagnosis Method Of P0441

  • Step 1: Park your car and turn the engine off. 
  • Step 2: Use an OBD-2 code scan tool and hook it up to the ECU equipment for inspection. You may wait for the freeze frame data to be copied, revealing the code.
  • Step 3: Once it appears, you clear the code and perform a drive test to see whether the check engine light switches off. 
  • Step 4: If it is still enabled, examine your EVAP system. You continue using the scan tool to check its components, such as the fuel tank, gas cap, vacuum switch and purge valve. 
  • Step 5: Suppose none of the steps produce results; contact professional mechanics for quick repair. 

The Diagnosis Method Of P0455

  • Step 1: Park your automobile and shut off all the motor parts.
  • Step 2: Carefully prepare some necessary tools, like a plier, a FIXD application, an EVAP smoke machine leak checker and a car manual. 
  • Step 3: Use the FIXD, a car scanner, to ensure that no other codes apart from P0455 are present. Suppose other error codes arise; address them first. 
  • Step 4: You must check your gas cap, as it is a common culprit behind the P0455 code issue. If it shows no signs of deterioration, perform the next step. 
  • Step 5: This step requires you to check for leaks in the EVAP system. Pinch off the tube of the EVAP control valve and place a leak checker inside the EVAP smoke machine. Once you see smoke leaking outside, the root of the Toyota P0455 code lies in a faulty EVAP system’s valve. 

How To Solve The P0441 And P0455 Codes?

The Solutions For P0441

  • Replace damaged motor parts, such as the EVAP canister, purge valve, vacuum switch or vent hoses.
  • Repair the wiring system or purchase new wires and protect them from corrosion with the help of non-sealed covers.
  • If the P0441 code is triggered by the failing wiring harness, a 6.6kW onboard charger is recommended in this case.
  • Clean the purge thoroughly to remove chemical substances and contaminants. 

The Solutions For P0455

  • If the PCM sends the code P0455 while you detect nothing abnormal with your car, call for the technician to check its overall health and replace if needed.  
  • Make a replacement of the charcoal filter, hoses, vent control valves and other important components. 
  • Tighten the gas cap kindly to prevent it from being too loose.
  • Tow your car to a reliable automotive workshop, so qualified maintenance specialists will check and solve your car’s wear.

Frequently Asked Questions

How Serious Are The P0441, P0455 Toyota 4runner?

They are not too serious in most situations, so you don’t need to worry. But their impacts on your vehicle cannot be denied, and the reduction in fuel economy is most notable. 

Can I Drive A Car With The P0441 And P0455 Codes?


This practice does not exert a tangible effect on your automobile, but it will wreak great havoc on its components, especially some in the EVAP system, in the long run. 

What Are The Estimated Costs For The P0441 And P0455 Codes’ Repair?

The repair costs for both error codes vary from 100 to 1500 dollars, depending on the extent of your car’s damage. 

The Bottom Line

We hope you will reap helpful knowledge about the P0441 P0455 Toyota codes and learn more about its causes, symptoms and corresponding remedies. 

Thank you for your support, and have a good day!

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