P0498 code meaning
EVAP System Vent Valve Control Circuit Low
Powertrain system Generic code P04xx codes Check engine light
What P0498 means
The evaporative emission (EVAP) system stores fuel vapour from the tank in a charcoal canister; a purge valve lets the engine draw it off, and a vent valve opens the canister to fresh air. The vent valve is normally open and switched to ground by the module; P0449 (open), P0498 and P0499 form the newer code scheme for its circuit, used mainly by GM and Saab models with GM engines, while Ford uses P0446. P0498 means the control wire is shorted to ground: GM sees 0.5 Ω or less to ground with the driver off (20 of 25 samples), Saab below 2.6 V – MIL after two trips. The valve is then permanently energised and closed, so the tank is not vented and refuelling becomes difficult.
P0498 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairAfter a drive cycle
Symptoms of P0498
- Check engine light on
- Refuelling difficult, nozzle clicks off
- Vacuum noise when opening the fuel cap
Common causes of P0498
- Most likelyVent valve control wire chafed against ground (underbody, tank area)
- PossibleVent valve coil shorted internally
- PossibleCorrosion or water in the connector
- Less likelyDriver in the engine module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
EVAP vent valveVent valve wiringEngine control module
What each part of P0498 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| 98 | The exact fault in that area. |
What to do next
- Note P0498 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0498
What does P0498 mean?
P0498 means "EVAP System Vent Valve Control Circuit Low". The evaporative emission (EVAP) system stores fuel vapour from the tank in a charcoal canister; a purge valve lets the engine draw it off, and a vent valve opens the canister to fresh air. It is a generic code, so it means the same on every make.
Is it safe to drive with P0498?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P0498 fail an emissions test?
Yes, it can. P0498 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0498 to fix?
Difficulty: easy. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P0498 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.