P0458 OBD-II Trouble Code: Evaporative Emission System Purge Control Valve Circuit Low

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0458 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0458 code

P0458 is a diagnostic trouble code (DTC) for "Evaporative Emission System Purge Control Valve Circuit Low". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
SCHEDULE P0458 DIAGNOSTIC Get a fair and transparent estimate upfront

Check Engine Light

Diagnostic Trouble Code (DTC): P0458

P0458 code definition

The P0458 code means that a specific part of the EVAP system purge control valve circuit has caused a voltage reading that does not match the manufacturer’s specifications, and is therefore malfunctioning in some way.

What the P0458 code means

When this code is detected by the OBD-II scanner, it means that there is an issue with the EVAP emissions system. This system controls the rate of vapor from the canister with a system purge control valve. Part of the circuit system for this valve measures and reports voltage to the PCM. If this reading is lower than the manufacturer’s specifications, the PCM assumes that there is a fault in the circuit, and stores the P0458 code.

What causes the P0458 code?

In many cases, this code could be present due to an improperly installed fuel cap. However, there may be more complex issues behind this code, including:

What are the symptoms of the P0458 code?

Most of the time, there will be no other symptoms present when the P0458 code is present. The Check Engine Light may be lit, and there may be other codes stored in the PCM relating to the EVAP emissions control system.

How does a mechanic diagnose the P0458 code?

The first step to diagnosing the issue behind the P0458 code is to verify the code with an OBD-II scanner, and to check for other codes present. Similar or related codes may reveal a larger issue that should be addressed first.

After verifying, the next step is to perform a visual check of all the electrical wiring and components, to ensure that there is not a loose, shorted, or corroded wire that is causing the PCM to receive a faulty signal. Additionally, the mechanic may wish to check that the fuel cap is installed properly, because this is frequently a simple reason for the presents of the P0458 code.

Once these inspections have been performed, the code should be cleared and the system retested. If the code returns to the PCM, then the mechanic has diagnosed a larger issue with the EVAP emissions system purge control valve circuit, and should move on to further repairs.

Common mistakes when diagnosing the P0458 code

The most common mistake made when diagnosing the P0458 code is to replace system components without first inspecting the fuel cap or the vacuum hoses for improper installation or leaks. A thorough diagnostic procedure should be performed before system components are replaced.

How serious is the P0458 code?

The P0458 code does not represent a serious issue that will affect the operation of the vehicle; however, its presence may cause a vehicle to fail an emissions test. If the P0458 code is detected, it should be addressed at the next routine servicing if not before.

What repairs can fix the P0458 code?

After checking and repairing the electrical wiring, connectors, and other components, and ensuring that the fuel cap is properly installed and not damaged, the mechanic may perform other repairs that include:

  • Replacing a faulty purge control solenoid.
  • Repairing, cleaning, or replacing a broken, clogged, or faulty charcoal canister.
  • Replacing faulty vacuum hoses.
  • Replacing faulty fuel vapor hoses.
  • Replacing a faulty pressure/flow sensor.
  • Replacing or repairing an open or shorted EVAP purge control solenoid harness.

After each repair is made, the code should be cleared from the PCM and the system should be retested. This process allows the mechanic to eliminate potential causes until they discover exactly what was causing the code to be stored.

Need help with a P0458 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

trouble codes
Check Engine Light
EVAP (Evaporative Emission Control) system

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0458 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

3,203

Rating Summary
2,919
140
39
22
83
2,919
140
39
22
83

Nathan

26 years of experience
198 reviews
Nathan
26 years of experience
Nathan was knowledgeable about my car and very educational as well. He explained everything he was doing and why. I admire his attention to detail. He really showed genuine interest and attentiveness to the problem. He’s a great conversationalist and was easy to work with.
2013 CHEVROLET CRUZE - CHECK ENGINE LIGHT IS ON - GLENPOOL, OKLAHOMA

Mack

19 years of experience
72 reviews
Mack
19 years of experience
Very nice and knew what he was doing. Got what I needed done even though was told wrong by the office.
1999 FORD F-150 - CHECK ENGINE LIGHT IS ON - MIDLOTHIAN, TEXAS

Scott

31 years of experience
24 reviews
Scott
31 years of experience
Very nice friendly mechanic. Very helpful with with questions that I had. Offered good advice. He explained some of the problems to me and what should be the next to resolve it before spending unnecessary monies. This was my first time using him and will not be my last. I would recommend him to anyone. Especially women because he does not seem to take advantage of our knowledge of not knowing things about cars.
2001 HYUNDAI ELANTRA - CHECK ENGINE LIGHT IS ON - PARKVILLE, MARYLAND

Tyrone

6 years of experience
61 reviews
Tyrone
6 years of experience
He showed up on time and got my diagnostic done quickly. He also gave me honest recommendations on what I need to do for my car.
2008 HONDA ACCORD - CHECK ENGINE LIGHT IS ON - CULVER CITY, CALIFORNIA

More related articles

How Long Does a Vacuum Brake Booster Check Valve Last?
The braking system on your car requires a lot of pressure. The vacuum booster is one of the main sources of this pressure. This booster will take the pressure that...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Get a Louisiana Driver's Permit
s licensing program. The first step in this program is to obtain...

Related questions

Q: Cut door trigger wire, reconnected it, and now the anti-theft is on and the car won't crank

Hello, thanks for writing in. If that was the only wire cut, the butt connector may not be sufficient to attach the wires together and they may have to be soldered. Some systems watch resistance readings through the circuit and...

Q: Check Engine light, code P0404.

Having the engine code is a great first step to getting your Pontiac Montana running up to speed again. This engine code is reading EGR, which stands for Exhaust Gas Recirculation. The EGR’s job is to redirect a measured portion...

Q: Engine does not start after fueling

Hi There, It sounds like your car's evaporative emissions system may have some problems. The EVAP system prevents fuel vapors from the fuel tank from escaping into the atmosphere as you are fueling your car and while the fuel just...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com