P0498
EVAP System Vent Valve Control Circuit Low
EVAP emissions
Generic OBD-II
Low
What it means
P0498 means the ECM detected a low-voltage (or shorted-low) fault in the control circuit for the EVAP canister vent valve. This valve seals and vents the evaporative-emissions system during leak tests. The engine runs normally — the practical effects are the check-engine light and an emissions-test failure until the wiring or vent valve is repaired.
Low
Can I keep driving? Safe to drive — this is an evaporative-emissions fault with no effect on how the engine runs; the main consequences are the warning light and a failed emissions test.
Common symptoms
What you'll notice
- Check-engine light on
- Emissions/smog test failure
- Often no noticeable driving symptoms
- Occasionally a faint fuel-vapor smell near the canister
Common causes
Most likely first
- Short-to-ground or low-voltage fault in the EVAP vent valve control circuitLikely
- Faulty EVAP canister vent valve/solenoidCommon
- Loose or corroded connector at the vent valveCommon
- Chafed or damaged wiring to the vent valve (often near the rear of the vehicle)Less often
- Rarely, a failed ECM driverLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and check the vent valve command vs. circuit voltage on a scan tool.
- Inspect the vent valve connector and wiring for a short-to-ground or open circuit.
- Measure the vent valve solenoid resistance and compare to spec.
- Replace the EVAP vent valve/solenoid if the wiring is good but it's out of spec.
- Clear the code and run an EVAP monitor drive cycle to confirm the fix.
FAQ
Quick answers
Is it safe to drive with P0498?+
Yes. It's an emissions-system code and doesn't affect drivability. Just be aware the car will fail an emissions test until it's repaired.
Can I just clear P0498?+
You can, but it will reappear once the EVAP monitor runs again unless the vent valve or its circuit is actually fixed.
Related codes
Often seen with P0498
Read & clear P0498 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX