Mitsubishi P0458 EVAP Emission System Purge Control Valve
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This code is common and will store itself in the vehicle’s computer and cause a check engine light on the dash. You will need to diagnose and repair the problem present to get rid of the check engine light. This guide will review the potential causes of the diagnostic trouble code P0458.
At a Glance
- Code: P0458, EVAP purge control valve circuit low
- What it is: An electrical fault in the purge valve or its wiring, not a vapor leak
- Common causes: Failed purge solenoid, damaged wiring, bad connector
- Test: Check the solenoid resistance and the wiring with a multimeter
- Driving: Usually safe short term, but the car will fail an emissions test
How to Troubleshoot Mitsubishi P0458 EVAP Emission System Purge Control Valve
Vehicle Applications
This applies to Mitsubishi Outlander model years: 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, and most other models such as the Outlander Sport, Mirage, Lancer, Galant, etc. equipped with the four-cylinder engine.
What does code P0458 mean?
P0458 means Evaporative Emission System Purge Control Valve Circuit Low. The engine computer switches the purge valve on and off and monitors its electrical circuit. When it sees a voltage lower than expected, it sets P0458. This is an electrical fault in the purge valve or its wiring, not an EVAP leak.
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Common Causes
- Faulty purge control valve (solenoid) with an open or shorted coil
- Damaged, chafed or corroded wiring between the purge valve and the engine computer
- Loose, corroded or broken connector at the purge valve
- Blown fuse feeding the purge valve circuit, on some models
- Rarely, a fault in the engine computer driver circuit
A loose gas cap, a cracked hose or a bad charcoal canister usually set other EVAP codes, such as P0455 or P0456, rather than P0458. If you have those codes too, work on the leak separately.
How do you diagnose the trouble code P0458?
Start by pulling the codes from the vehicle with an OBDII scan tool; if there are other codes along with the P0458, that indicates where to start looking for malfunctioning components in the EVAP system.
The YOUCANIC UCAN-II Pro can read and clear codes from all the systems in your vehicle. This powerful scanner can also perform bi-directional tests, maintenance and repair resets, and more.
Always check the fuel cap to make sure it is closed properly. The most common cause of this code is leaving the gas cap off.
The second most common cause of this code is overfilling the gas tank. Overfilling the gas tank occurs when you keep pumping gas even after the pump has stopped to get that extra bit of gas or to reach an even number on the dollar mark. Overfilling the gas tank will flood the charcoal canister and cause it to become clogged, setting off this code, and the charcoal canister must be replaced.
Further diagnosis of this code will require technical automotive knowledge, including knowledge of electrical systems.
A professional OBDII scan tool from the manufacturer that can read system voltages and technical charts with the correct voltages will also be needed. The vehicle should be taken to the shop and diagnosed by a trained technician with the proper equipment.
Frequently Asked Questions
What does code P0458 mean on a Mitsubishi?
It means the EVAP purge control valve circuit voltage is lower than expected, which points to the purge valve or its wiring.
Can a loose gas cap cause P0458?
No. A loose gas cap causes EVAP leak codes such as P0455 or P0456. P0458 is an electrical circuit fault.
Is it safe to drive with P0458?
Usually yes for a short time, but the check engine light will stay on and the car will fail an emissions inspection.
How do I fix P0458?
Inspect the purge valve connector and wiring, test the valve coil with a multimeter, and replace the valve or repair the wiring as needed.
Check these troubleshooting and repair guides for more help on your Mitsubishi.
