OBD-II Code P0452: Low Input In Evaporative Control System Pressure Sensor

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How to fix P0452 obd2 code?
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Everyone wants to keep their vehicle in good condition, but maintaining a vehicle is expensive. However, some issues can be resolved without spending too much money. The OBD code P0452 is a trouble code for Evaporative Emission Control System Pressure Sensor Low Input. It is linked with the vehicle’s evaporative emissions control system (EVAP), which regulates fuel tank pressure. P0452 is a code that indicates a problem with the emission system.

OBD2 code P0452: What is it and what does it indicate?

Fuel Tank Pressure Sensor Circuit Low Voltage


OBD is a self-diagnostic system for all vehicles, which stands for On-Board Diagnostic. OBD2 codes are the codes that the car’s OBD system uses to inform you about an issue. Check Engine Light Codes and Diagnostic Trouble Codes (DTC Codes) are other names for it. It is essential for mechanics and drivers who want to understand what happened to their vehicles. 

OBD-II Code P0452: Symptoms, Causes & Diagnose

Causes of P0452 OBD2 Code

The causes of the P0452 Error are as follows: 

  • Error in the Evap Pressure Sensor
  • Fuel Tank Pressure Sensor Fault
  • A gas cap that is loose/leaking
  • Evaporative line crack
  • Evaporative seals that are leaking
  • Wiring that is open/shorted
  • The sensor has a bad connection.

Symptoms of P0452 OBD2 Code

In most cases, you will not have any symptoms associated with the P0452 code. However, the following are the basic signs that indicate this error:

  • The Check Engine Light is displayed.
  • Fuel smell is noticeable due to the release of fuel vapors.

How to diagnosis P0452 OBD2 Code

Mechanics begin their diagnosis of this code, like most EVAP-related error codes, by following the steps given below:

  • Inspecting the fuel cap and retightening the cap.
  • Then, the specialist clears the code and resets the engine computer before taking the vehicle to a test drive to see if the code returns.
  • If the code does not return, it could simply be a result of the loose gap.
  • If the code appears again, the problem must be with the fuel tank pressure.
  • To conduct additional testing, the technician will use an OBD-II scanner to check the fuel tank pressure readings and see if the engine computer is receiving a vacuum from the sensor.
  • If not, the sensor’s wiring must be checked to ensure there is no communication error before replacing the sensor.

Tools needed for diagnosis:

Following are the basic tools that you might need to diagnose the error:

  • Basic Hand Tools 
  • Vehicle Specific Service Manual 
  • EVAP smoke machine leak checker 
  • Multimeter 

Mistakes to avoid while diagnosing P0452

To resolve the OBD code P0452 error, it is critical to follow the correct diagnosis. Unneeded replacements should be avoided in the absence of a thorough inspection. Before replacing sensors or other expensive components, always check for loose caps and damaged valves, as well as faulty wiring.

How to fix the P0452 OBD2 code

How to fix the P0452 Evaporative Emission Control System Pressure Sensor Low Input OBD2 code?

You don’t need to go to the mechanic every time you see the check engine light for this code. Some steps to fix the P0452 error code are given below:

  • Check your gas cap to see if it is loose or damaged.
  • If it’s loose, tighten it and clear the code.
  • Examine the gas cap for any physical damage. It should be noted, however, that damage to the gas cap or deterioration of its components is not always visible. If your gas cap is not loose and you see no signs of failure, replace the gas cap anyway and clear the codes. Gas caps are relatively inexpensive and are frequently used to resolve various codes.
  • If the problem still prevails, perform an EVAP system leak test.
  • If the fuel tank pressure data is not recorded by the system, it indicates either a wiring issue, a vacuum leak, or a faulty sensor.
  • Then the damaged wiring to the fuel tank pressure sensor has to be repaired. 


How does PCM detect error codes?

Error Code P0452 is displayed when the PCM (powertrain control module) identifies that the system pressure is lower than normal, indicating a problem with the system as a whole, instead of just the sensor. This sensor is only used for emission control strategies. Therefore, to identify the root cause you need to perform a diagnosis.  

How to avoid the P0452 OBD code?

The majority of P0452 codes occur when the driver does not completely close the gas cap after filling the tank. Taking a moment to double-check that the gas cap is securely screwed on ensures that your fuel system can generate a proper vacuum, preventing the activation of many EVAP codes.

Where is the EVAP pressure sensor located?

The EVAP Pressure Sensor, also known as the Fuel Tank Pressure (FTP) Sensor, is a device that measures air pressure or vacuum in the EVAP system. This sensor is usually located on top of or inside the fuel tank.

Final discussion

Error Code P0452, like most EVAP-related codes, raises the vehicle’s emissions but has no effect on the vehicle’s drivability or performance. Make certain that your solution is appropriate for the make and model of your vehicle. Before attempting to resolve the P0452 error code, consult your owner’s manual.

On the whole, the OBD2 P0452 Error code is not that harmful to your car but it’s better to get the problem fixed immediately so that you can use your vehicle when it is in its optimal condition.