Guide To P0453 OBD Error Code Solutions

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P0453 is a generic powertrain code, which applies to OBD-II equipped vehicles. Although generic, the specific repair steps may vary depending on make/model.

 

The EVAP System allows fuel tank vapours to be purged into the engine and burnt rather than expelled into the atmosphere as harmful emissions. The EVAP system contains a pressure sensor to check the integrity of the system. The input from the pressure sensor is acknowledged by the PCM in terms of voltages and any anomaly more than a certain period of time is treated as an error.

The evaporative emission (EVAP) control system pressure sensor is used for on board diagnosis of the EVAP system itself to check for leaks and does not initiate or control changes to the EVAP purge or vent valve operations. It detects and measures pressure in the purge line of the EVAP system. The pressure sensor’s output voltage increases as the pressure in the purge line increases, and the sensor voltage output is monitored by the powertrain control module (PCM).

 

The EVAP control system pressure sensor converts pressure to a voltage reading which is then communicated to the PCM via a signal wire connected to the sensor. There are three wires for the EVAP pressure sensor: a ground, a 5v reference signal, and the sensor signal wire.

 

The EVAP pressure sensor is only monitored under certain conditions which can make it tricky to diagnose. Voltage is monitored by the PCM only once the vehicle speed sensor has recorded a trip of one minute at a minimum speed of 10 miles per hour. The PCM only monitors the EVAP control system pressure sensor when the fuel tank level is between 25 and 75 percent. The code P0453 is set when the ECM reads a high voltage signal from the EVAP control system pressure sensor.

 

What causes this problem with the EVAP Pressure Sensor High Input?

 

• Open on FTP (Fuel Tank Pressure) sensor signal wire
• Short to voltage on FTP sensor signal wire B and FTP sensor
• Abnormally high pressure in fuel tank due to blockage
• FTP sensor connector loose or damaged
• Loss of ground to the sensor

1. Fuel Tank Filler Neck - Inspect the fuel tank filler neck for any faults and replace it now. Buy new parts from us.
2. Fuel Tank Vent Valve - Check for a defective valve that might not even open properly. Replace it with a new one immediately.
3. Vapour Canister Valve - If the vapour canister valve is defective, it may require immediate replacement. Buy new canister valve now!
4. Fuel Tank - Fuel tank can be leaky or clogged and might require replacement. Buy new fuel tank now!
5. Fuel Tank Cap - Check if the cap gets tightened properly or might be cracked. Replace it now!
6. Diagnostic Tools - Quality OBD scanner and tools is required to resolve this OBD issue. Buy new diagnostic tools from us.

It is essential to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0453 here:

 

Common Symptoms

 

• Check Engine Light On
• Noticeable fuel odor caused by the release of fuel vapours
• Reduced fuel economy

We have listed out some ways which would help you to correct the occurrence of OBD Code P0453. They are mentioned here as follows:

 

• Replacement of faulty/damaged wiring
• Replacement of faulty connections
• Replacement of EVAP pressure sensor and/or FTP sensor.

There is no need to be anxious as Parts Avatar – Car Parts Online is here to help you out! We have high grade Fuel Tank Filler Neck, Evaporative Vent Valve, EVAP Purge Switch, Carbon Canister, Fuel Tank, Fuel Cap and a lot more for our precious customers.

Here are some steps which you should follow in order to diagnose this fault code:

 

Locate the EVAP canister under your vehicle. It may be attached to the fuel tank or it may be separate from the fuel tank with hoses running to the fuel pump at the fuel tank. Check that the EVAP control system pressure sensor connector is fully seated and clipped in.

 

Inspect the sensor connector for corrosion at the wires. Disconnect the sensor and inspect the pins in the terminal to ensure they are clean and moisture free. Trace the wiring from the sensor back to determine if there are any breaks swollen spots on the wiring insulation that can indicate corrosion inside the wire. You may have to remove loom or electrical tape to inspect the wiring.

 

With a multimeter, verify your reference wire has 5 volts and check the continuity of the ground circuit. Probe the sensor signal wire with a multimeter set to read voltage. With the key in the on position but the engine not running, read a voltage value somewhere around 3 volts. Remove the hose attached to the EVAP pressure sensor and apply vacuum with a vacuum tester, monitoring changes in voltage on multimeter. If the voltage changes with vacuum applied, the sensor is operating. If the voltage doesn’t change with vacuum applied, the sensor is faulty.

 

If using a scan tool, access the EVAP pressure sensor reading in freeze frame data with a scan tool. The key must be in the on position with the engine off. The normal reading from the EVAP pressure sensor should be roughly 3 volts and should never exceed 4.5 volts. If the code P0453 is set in the ECM and the voltage is reading in the normal value range, it is likely having an intermittent problem.

 

Next, perform a wiggle test on the wiring to determine if there is a communication problem from the sensor to the ECM. Wiggle along the length of the circuit, monitoring the reading on your scan tool to see if there are fluctuations in the voltage. If the voltage spikes or drops off while you are wiggling a section of wire, you likely have a break in the wire that needs to be repaired.

 

If the high voltage disappears when the sensor is unplugged, the ground circuit is good, and the reference voltage is correct, that there is a blockage in an EVAP purge system hose. Disconnect the hoses from the EVAP purge valve and blow compressed air through them to make sure they are free-flowing. If there is a blockage, replace the hose.

 

Common Mistakes When Diagnosing the P0453 Code

 

Always check for the following components;

 

• Fuel Tank Sending Unit defects
• Defective or damaged Fuel Tank
• Fuel Tank Pressure Sensor, wiring, or computer faults
• Carbon Canister faults
• Defective Canister Vent Valve which might not open