P0458: Evaporative Emission System Purge Control Valve Circuit Low
Updated November 15, 2026
The engine computer switches the EVAP purge valve on and off to draw stored fuel vapors from the charcoal canister into the engine. P0458 means it sees a low voltage on the valve's circuit, usually because of an open circuit, missing power or a short to ground. It's an electrical fault, not a vapor leak.
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🔧 Want to check this yourself? An OBD2 scanner reads the code; models with live data also show the sensor readings used in the checks below. See code readers and scanners from $24.99 ↓ · Which scanner do I need?
Common causes
- A failed purge valve (purge solenoid) with an open coil
- A blown fuse or lost power feed to the valve
- A broken wire, a wire shorted to ground, or a loose or corroded connector
- A fault in the engine computer's valve driver (less common)
Code meanings can vary slightly by manufacturer. Use these as a starting point and confirm with your vehicle's service information or a mechanic before replacing parts.
Symptoms
- Check engine light
- Usually no change in how the car drives
- Failed emissions inspection
Is it safe to drive?
Usually safe to drive with a steady light, but get it fixed to pass inspection.
How to check it with a scanner
- Plug an OBD2 scanner into the port under the dashboard and read all stored codes and the freeze-frame data (the conditions when the code set).
- With the key off, find the purge valve (usually on or near the intake manifold) and make sure the connector is fully seated and free of corrosion.
- Check the fuse that feeds the purge valve. With the connector unplugged and the key on, a multimeter should show battery voltage on the power wire.
- Measure the valve's coil resistance with the key off; an open reading means the valve has failed. Compare with your vehicle's spec.
- If your scanner can command the purge valve, listen or feel for it clicking. If the engine needs to run for the test, keep hands clear of the belts and fan.
- After a repair, clear the code and drive normally for a few days to confirm it doesn't come back.
A basic code reader shows the code; scanners with live data let you watch sensor readings, which is what you need for most of the checks above. See OBD2 scanners under $100.
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Questions
What does P0458 mean?
P0458 is the generic OBD2 code for "Evaporative Emission System Purge Control Valve Circuit Low." The engine computer switches the EVAP purge valve on and off to draw stored fuel vapors from the charcoal canister into the engine. P0458 means it sees a low voltage on the valve's circuit, usually because of an open circuit, missing power or a short to ground. It's an electrical fault, not a vapor leak.
Is it safe to drive with P0458?
Usually safe to drive with a steady light, but get it fixed to pass inspection.
How do I check P0458 myself?
Read the code and freeze-frame data with an OBD2 scanner, then: With the key off, find the purge valve (usually on or near the intake manifold) and make sure the connector is fully seated and free of corrosion. Check the fuse that feeds the purge valve. With the connector unplugged and the key on, a multimeter should show battery voltage on the power wire. Measure the valve's coil resistance with the key off; an open reading means the valve has failed. Compare with your vehicle's spec. If your scanner can command the purge valve, listen or feel for it clicking. If the engine needs to run for the test, keep hands clear of the belts and fan.
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