P0458 The computer sees a low voltage on the EVAP purge control valve circuit

EVAP purge control valve circuit low

Severity not verified — if the car runs badly, have it inspected

TroubleCodes.net and the Land Rover bulletin describe a purge valve circuit fault. The Volt cases show a Reduced Propulsion message when several codes set together, but no source rates the single code, so the class is not set.

Source: how we rate severity

P0458 in short

P0458 means the engine computer sees a low signal on the EVAP purge control valve circuit. It is usually an electrical fault in the valve, wiring or connector. On 2016-2018 Chevrolet Volts it appeared with many other codes after a blown fuse, with a Reduced Propulsion warning, so have a multi-code case checked soon.

The purge valve is a solenoid the computer switches to let fuel vapor into the engine. P0458 says the valve circuit voltage is lower than the computer expects, which points to a short to ground, a wiring fault or a failing valve.

TroubleCodes.net lists defective purge solenoids and wiring faults along with a fuel cap and canister fault. Land Rover groups the code with other purge valve codes on certain models.

Four Chevrolet Volt owners list P0458 among long code lists with P0443 and P0489. One shop traced the group to a blown underhood fuse and cites GM bulletin 24-NA-080, which says an EGR valve short can be the cause.

Most likely causes

  1. Blown shared fuse from an EGR valve short (2016-2018 Volt)

    Supported by vehicle data
    Why it ranks here
    Two Volt records say fuse F03 or fuse 3 was blown, one cites GM 24-NA-080 and an EGR valve short. The bulletin summary asks for the harness check and an EGR valve replacement.
    What would change this
    Rises if the Volt also has P0489 and P0443 and the fuse is blown. Falls if the fuse is intact.
    How to test the underhood fuse block (engine compartment fuse box)

  2. Wiring, connector or purge valve solenoid fault

    Common general cause
    Why it ranks here
    TroubleCodes.net lists faulty purge solenoids and wiring faults such as open circuits, shorts and corrosion.
    What would change this
    Rises if wiring or the valve coil fails a test. Falls if they test good.
    How to test the evap canister purge valve

  3. Gas cap, canister or other EVAP parts

    Possible — needs testing
    Why it ranks here
    TroubleCodes.net says the most common cause it lists is a defective or badly fitted fuel cap or a clogged or corroded canister. That list is general to EVAP and not specific to this circuit code.
    What would change this
    Rises if other EVAP codes are stored and the cap is loose or damaged. Falls if only the purge circuit code is stored.
    How to test the fuel (gas) cap

What to test first

Start at step 1. Each result tells you what it means and where to go next.

  1. Read all stored codes. Note whether P0443, P0489 or P0597 and P0598 are stored with P0458.

    Low riskTool: OBD-II scan tool

    • IfMany codes are stored on a Volt and there is a Reduced Propulsion message

      It meansCheck the underhood fuse and the EGR valve wiring next.

      Go to step 2

    • IfOnly purge or EVAP codes are stored

      It meansCheck the valve wiring.

      Go to step 3

  2. On a 2016-2018 Volt, have a shop check the underhood fuse (reported as fuse 3 or F03) and the EGR valve wiring.

    Best left to a shopTool: multimeter

    Warning:Fuse and harness testing on a plug-in hybrid sits near high-voltage components and live circuits; leave it to a shop trained for the model.

  3. Check the purge valve connector and wiring for damage or corrosion, then have the valve coil tested.

    Best left to a shopTool: multimeter

    Warning:The valve sits near fuel vapor lines on a hot engine; keep sparks and flames away and let the engine cool.

Symptoms

  • Check engine light
  • Reduced Propulsion warning on a Volt when many codes set together
  • Failed emissions test

How to fix

  1. Tighten the gas cap and recheck after a few trips.

  2. If you drive a 2016-2018 Chevrolet Volt, ask a dealer about GM bulletin 24-NA-080.

Parts and cost context

  • EVAP canister purge valve:Check wiring and connector before replacing the valve. On the Volt, owner records point to the fuse and EGR valve instead. Labor varies; get a quote.
  • Underhood fuse block (engine compartment fuse box):Volt records describe a blown 15-amp fuse in the underhood block; replacing a fuse alone does not fix a short.

Labor varies by vehicle and shop; get a quote before you approve a repair.

Compare used part prices on PartPriceGuide

On your vehicle

Chevrolet

  • 2016–2018 · Volt

    Supported by vehicle data

    Four owner and shop records list P0458 with P0443 and P0489; one traces them to a blown fuse and cites GM 24-NA-080. Whether the bulletin is still current is not verified.

  • 24-NA-080Status unverified

    MIL on: check harness and replace the EGR valve

    2016–2019volt · NHTSA 11010577

    Check the wiring harness to rule it out, then replace the EGR valve for the MIL concern. The summary does not name a code.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • P0443EVAP purge valve circuit fault

    Same system Supported by vehicle data

    P0443 is the purge valve circuit malfunction code and appears with P0458 in the Land Rover and Volt records.

  • P0444The computer sees an open circuit on the EVAP purge control valve

    Same system Supported by vehicle data

    P0444 is the open circuit version of the same purge valve circuit; Land Rover lists both together.

  • P0489The computer sees a low voltage in the EGR valve control circuit

    Shares causes Supported by vehicle data

    On the 2016-2018 Volt, P0458 and P0489 appear together in the owner and shop records that trace the group to one fuse.

All EVAP (evaporative emissions) codes

Sources and review

  1. NHTSA complaint ODI 11632222 — NHTSA Office of Defects Investigation
  2. NHTSA complaint ODI 11757544 — NHTSA Office of Defects Investigation
  3. GM 24-NA-080: 2016-2019 Chevrolet Volt, MIL on, replace the EGR valve — General Motors
  4. P0458 trouble code explanation — TroubleCodes.net
  5. Land Rover SSM71658: purge valve concern, P0442, P0444, P0456, P0458, P0459, P0496, P0497 — Jaguar Land Rover
  6. NHTSA complaint ODI 11448862 — NHTSA Office of Defects Investigation
  7. NHTSA complaint ODI 11681144 — NHTSA Office of Defects Investigation
Last reviewed
Written by
Saurabh K.
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