P0458

EVAP System Purge Control Valve A Circuit Low

Evaporative emissions (EVAP) Generic OBD-II Low

What it means

P0458 means the engine computer has detected low voltage in the EVAP purge control valve circuit. The purge valve feeds stored fuel vapors from the charcoal canister into the engine. It's mainly an emissions fault, though a purge valve stuck open can slightly roughen the idle. The car keeps driving, but the light stays on and it can fail emissions.

Low

Can I keep driving? Yes — mostly an emissions fault. If the idle feels rough the purge valve may be stuck open, so fix it before an emissions test.

Real-world scan data

Seen in

376

scans in the past year

Found in

0.1%

of scans

0.1%

of scans that found faults

Appears alongside · share of P0458 scans

P0480in 34.8% of scans

P0645in 33.0% of scans

P1141in 31.1% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Fails an emissions test
Occasionally a rough or unstable idle
Sometimes a faint fuel odor

Common causes

Most likely first

Faulty EVAP purge control valve/solenoidLikely
Wiring shorted to ground or a corroded connector (low voltage)Common
Open or damaged wiring in the circuitCommon
Failed ECM (rare)Less often

How to diagnose & fix

Work through it in order

Inspect the purge valve connector and wiring for shorts to ground or corrosion.
Measure the purge solenoid resistance against spec.
Check that the purge valve holds vacuum and isn't stuck open (which can roughen the idle).
Replace the purge control valve if it fails testing.
Only consider the ECM after the valve and wiring check out.

FAQ

Quick answers

Is it safe to drive with P0458?+

Yes, in most cases — it's primarily an emissions-control fault. If the purge valve is stuck open you may notice a rough idle, but the car remains driveable. Fix it before an emissions test.

Can I just clear P0458?+

It will return once the ECM re-tests the purge circuit. The valve or its wiring needs repair to keep the code from coming back.

Read & clear P0458 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX