OBD-II Code · Powertrain
P0498
EVAP Vent Valve Control Circuit Low
EVAP vent valve control circuit reading low.
Common symptoms
- CEL
Likely causes
- Failed vent valve
- Wiring short
- Bad PCM driver
Where to start
- Try the cheapest cause first. Start by checking: failed vent valve.
- Cost & scope. $100-$350
- If the code returns after the fix: escalate to a shop or scanner with live-data and freeze-frame. A code that re-sets means the underlying fault is still there.
Read the full diagnostic procedure
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 patterns
Vehicle-specific patterns: 2003-2011 Honda 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; 2007-2014 Toyota Tundra/Sequoia 5.7L vent valve harness chafes against the frame rail; 2005-2010 Chevrolet Cobalt/HHR vent solenoid cracks from heat-cycling and water intrusion; 2008-2013 Nissan Rogue/Sentra vent control valve fails after spider/insect ingress through the vent filter. Estimated repair: $130 to $480.
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