OBD-II Code · Powertrain
P0498
EVAP Vent Valve Control Circuit Low
Severity
low
Lowest on our scale. Fix it when convenient.
Can you drive it
Only if running normally
A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety.
Indicative cost (USD)
$100–$350
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
EVAP vent valve control circuit reading low.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then work the likely-causes list in the order shown.
That order is what a shop checks first for this code — wiring and connections before the component they run to, because a connector costs nothing to inspect and is a common answer.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
Likely causes
- Failed vent valveMost common
- Wiring short
- Bad PCM driver
Read the full diagnostic procedureP0498 indicates the EVAP canister vent valve control circuit voltage is low, pointing to a short to ground in the wiring, a shorted solenoid winding,…
P0498 indicates the EVAP canister vent valve control circuit voltage is low, pointing to a short to ground in the wiring, a shorted solenoid winding, or a PCM driver fault. The vent valve (often called CVS, CVSV, or vent solenoid) sits at the carbon canister, typically mounted underbody near the rear, which exposes it to road spray, salt, and impact damage.
Cheapest first
- visually inspect the vent valve and its connector for road-debris damage, corrosion, or water ingress.
- Disconnect the vent valve and measure resistance across the terminals (expect 20-30 ohms on most domestic applications, 23-27 ohms on Honda); a low reading or short to ground confirms internal failure.
- The expensive misdiagnosis is replacing the full canister assembly ($350-$700) when a $60 vent valve and a section of harness repair would have resolved it.
Vehicle-specific patterns2003-2011 Honda Element/CR-V/Pilot canister vent shut valve (CVSV) corrodes internally from road salt and is covered under extended emissions warrant…
- 2003-2011Honda Element/CR-V/Pilot canister vent shut valve (CVSV) corrodes internally from road salt and is covered under extended emissions warranty per Honda Service Bulletin 12-046;
- 2007-2014Toyota Tundra/Sequoia 5.7L vent valve harness chafes against the frame rail;
- 2005-2010Chevrolet Cobalt/HHR vent solenoid cracks from heat-cycling and water intrusion;
- 2008-2013Nissan Rogue/Sentra vent control valve fails after spider/insect ingress through the vent filter.
Estimated repair$130 to $480.
Look up another code
P0498 — frequently asked
What does a P0498 code mean?
EVAP vent valve control circuit reading low.
What causes a P0498 code?
Common causes: Failed vent valve; Wiring short; Bad PCM driver.
What are the symptoms of a P0498 code?
Typical symptoms: Check engine light.
Is it safe to drive with a P0498 code?
Only if running normally. A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety. Estimated repair: $100-$350.
How do I diagnose a P0498 code?
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed. 1. Note every code that is set, not just this one. 2. Read the freeze frame — the conditions the fault was recorded under. 3. Confirm the fault is current rather than history. 4. Then work the likely-causes list in the order shown.
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