When a Subaru vehicle experiences the code P0458, the evaporative emission system purge control valve circuit is low. This code is often accompanied by improper idling, a battery voltage of 10.9 or higher, and a low output voltage from the purge control solenoid terminal. While there are several potential causes for this issue, understanding the underlying issues and possible solutions is essential to ensuring that your Subaru runs smoothly.
💥See also: Subaru Code P1718
Causes and Solutions for Subaru Code P0458
| Cause | Solution |
|---|---|
| The power supply circuit needs to be repaired | Check for faulty wiring or connections and replace or repair damaged components. |
| The wiring harness between the ECM and purge control solenoid valve must be repaired. | Inspect and replace any damaged wiring, connectors, or components. |
| Poor contact of purge control solenoid valve connector | Clean and tighten any corroded or loose connections. |
| Defective purge control solenoid valve | Replace or repair the damaged or faulty valve. |
Faulty Wiring and Connections
The Subaru code P0458 occurs when the evaporative emission system purge control valve circuit’s power supply circuit is low. This can be caused by faulty wiring or connections, which must be checked, replaced, or repaired.
Poor Contact of Purge Control Solenoid Valve Connector
Another cause of this issue is poor contact with the purge control solenoid valve connector. Cleaning and tightening corroded or loose connections can easily solve this.
⚡️Other article: Subaru Code P0442
Defective Purge Control Solenoid Valve
Sometimes, a defective purge control solenoid valve can cause this code. If this is the case, the valve must be replaced or repaired.
Conclusion
The Subaru Code P0458 is often accompanied by improper idling, a battery voltage of 10.9 or higher, and a low output voltage from the purge control solenoid terminal. To ensure that your Subaru runs smoothly, it is essential to understand the potential causes and solutions for Subaru Code P0458. You can ensure that your Subaru runs properly by checking for faulty wiring and connections, cleaning and tightening any corroded or loose connections, and replacing or repairing any damaged components.
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