P0458 EVAP Purge Control Valve Circuit Low

P0458 – OBD-II Trouble Code Technical Description

Low signal level in the evaporative emission system purge control valve circuit

What does the fault code mean P0458?

On vehicles with evaporative emissions control (EVAP) systems, the engine draws excess fuel vapor from the gas tank to prevent emissions and reduce environmental impact. The EVAP system includes several components, including the fuel tank, charcoal canister, tank pressure sensor, purge valve, and vacuum hoses. When the engine is running, these components work together to prevent fuel vapors from escaping.

When the engine starts, the purge valve on the canister opens, allowing fuel vapor to enter the engine intake manifold using a vacuum. This improves the fuel/air mixture. A pressure sensor in the tank monitors pressure changes and when the system reaches the desired state, both valves close, preventing vapor from escaping. The PCM (engine control module) or ECM (powertrain control module) controls this process.

Code P0458 indicates problems in the EVAP system related to the purge control valve. When the OBD-II scanner detects this code, it indicates low voltage in the valve circuit.

Possible reasons

Trouble code P0456 may be caused by the following:

1. Fuse or relay is defective.
2. The purge control valve is faulty.
3. Faulty EVAP purge solenoid control.
4. Problems with the motor wires, such as broken or broken wires or a short circuit.
5. Open or short circuit in the purge control solenoid.
6. Malfunction of the PCM/ECM (engine or transmission control module).

In some cases, this code may be caused by an incorrectly installed fuel cap. However, more serious problems are also possible, such as:

• The purge control solenoid is faulty.
• The coal container (coal canister) is damaged, clogged or faulty.
• Faulty vacuum hoses.
• Faulty fuel steam lines.
• Faulty pressure/flow sensor.
• Open or short circuit in the EVAP purge control solenoid wires.
• Defective, corroded, loose, open or shorted electrical components in the EVAP purge control valve circuit, including wires and connectors.
• Check for malfunction of the EVAP purge solenoid valve.
• An open or short circuit in the evaporative emission control (EVAP) purge solenoid valve control circuit.

What are the symptoms of a fault code? P0458?

In most cases, when a P0458 code is present, there will be no other symptoms except for the possible illumination of the Malfunction Indicator Lamp (MIL) or the Check Engine Light/Service Engine Soon light. This code may also be accompanied by other trouble codes in the EVAP emission control system. In rare cases, a gas odor and/or a slight decrease in fuel efficiency may occur.

How to diagnose a fault code P0458?

Diagnosing the P0458 code begins by checking for technical service bulletins (TSBs) that apply to your vehicle to rule out known problems. This is followed by a visual inspection of electrical wires and components for damage, short circuits or corrosion.

If the problem is not resolved, a mechanic may want to check that the fuel cap is installed correctly, as this could be a simple reason for the P0458 code. After this, the code should be cleared and the system rechecked.

If the code returns, your mechanic will need to do a more detailed diagnosis of the EVAP purge control valve circuit. This may include checking the electrical performance of the purge control solenoid and connector pins, as well as checking the PCM/ECM command to turn on the EVAP system.

Diagnostic errors

Trouble code P0458 is related to the evaporative emission control (EVAP) system and indicates problems with the purge control valve. Although this code is not critical to immediate driving safety, it requires attention and timely repair.

First of all, P0458 can cause a subtle deterioration in fuel efficiency. Incomplete treatment of fuel vapors can result in the loss of valuable fuel resources and increased emissions of harmful substances into the atmosphere, which is not an environmentally sustainable practice. Additionally, if the P0458 code reoccurs, additional diagnostics should be performed to detect and correct more serious EVAP system problems that could affect the vehicle's long-term reliability and performance.

It's important to note that ignoring this error can lead to greater environmental impacts and fuel costs over time. Therefore, it is recommended that you have a professional diagnose and resolve the P0458 code immediately to maintain optimal performance of the evaporative emission control system and reduce the negative impact on the environment and fuel economy.

How serious is the fault code? P0458?

Trouble code P0458 is not critical, but requires attention as it can lead to poor fuel efficiency and emissions.

What repair will help eliminate the code? P0458?

To resolve error code P0458, the following repair steps are recommended:

1. Checking and replacing the purge control valve: The first step is to check the condition and functionality of the purge control valve. If the valve is not functioning properly, it should be replaced.
2. Checking and repairing electrical connections: Check the electrical connections, wires and connectors in the purge valve control system. Replace or repair any damaged or broken wires.
3. Checking and replacing the purge control solenoid: If a malfunction is detected with the purge control solenoid, it should be replaced with a new and working one.
4. Checking vacuum hoses and connections: Carefully inspect the vacuum hoses and connections in the EVAP system. Replace any damaged or clogged hoses.
5. Checking and replacing the pressure/flow sensor: Check the pressure or fuel flow sensor in the EVAP system and replace it if necessary.
6. PCM/ECM Diagnostics: If other components are working properly but the P0458 code continues to appear, there may be a problem with the PCM/ECM. Perform additional diagnostics and replace the PCM/ECM if necessary.

After performing these repairs, the P0458 code should be resolved. However, it is also recommended to have your EVAP system tested to ensure it is functioning properly and avoid future problems.

What is P0458 Engine Code [Quick Guide]

P0458 – Brand-specific information

Code P0458 - Brand Specific Information:

1. ACURA: EVAP purge control solenoid open.
2. AUDI: Short circuit to ground in the purge control valve circuit.
3. BUICK: EVAP purge control solenoid voltage low.
4. CADILLAC: EVAP purge control solenoid voltage low.
5. CHEVROLET: EVAP purge control solenoid voltage low.
6. CHRYSLER: EVAP purge control solenoid voltage low.
7. DODGE: EVAP purge control solenoid voltage low.
8. FORD: EVAP purge control solenoid voltage low.
9. GMC: EVAP purge control solenoid voltage low.
10. HONDA: EVAP purge control solenoid open.
11. HYUNDAI: EVAP purge control solenoid open.
12. INFINITI: EVAP purge control solenoid open.
13. JEEP: EVAP purge control solenoid voltage low.
14. KIA: EVAP purge control solenoid voltage low.
15. MAZDA: EVAP purge control solenoid voltage low.
16. MITSUBISHI: EVAP purge control solenoid voltage low.
17. NISSAN: EVAP purge control solenoid voltage low.
18. PONTIAC: EVAP purge control solenoid voltage low.
19. SATURN: EVAP purge control solenoid voltage low.
20. SCION: EVAP purge control solenoid voltage low.
21. SUBARU: EVAP purge control solenoid voltage low.
22. SUZUKI: EVAP purge control solenoid open.
23. TOYOTA: EVAP purge control solenoid voltage low.
24. VOLKSWAGEN: Short circuit to ground in the purge control valve circuit.

P0458 SUBARU DESCRIPTION

The EVAP canister purge volume control solenoid valve uses an on/off function to control the flow of fuel vapor from the EVAP canister. This valve is switched using on and off pulses from the engine control module (ECM). The duration of the activation pulse determines the amount of fuel vapor that passes through the valve.