What is the P0498 fault number? What is the Evaporative Emission System Valve Control Circuit Lower? How can I fix the fault code P0498? What are the causes and symptoms of the P0498 error code?
What is the P0498 Fault code? What does it mean?
A P0498 code indicates that either the powertrain controller module (PCM), or the engine control modules (ECM), has detected a malfunction at the valve that controls evaporative emission.
Evaporative emission systems (EVAPs) are responsible for capturing fuel vapors and returning them to the engine to be re-burned. The EVAP system consists primarily of hoses and valves. The fuel vapors are stored in a sealed chamber called a canister container. It contains a carbon filter until they reach the predetermined pressure. If favorable conditions exist, the PCM opens the relief valve at or near the canister to let fuel vapors in. To monitor EVAP system efficiency, the PCM uses an EVAP pressure sensor.
The vent valve in the EVAP system works together with the canister canister to allow fresh, clean air to enter the system. Vent valves are designed to allow air to enter the system, and to assist in the removal of fuel vapors from the canister canister. The vent valve should be in its normal open position for almost all applications. The powertrain control module (PCM), which tests the system for leakage, applies a 12 V current to the circuit. It then closes the vent valve.
The PCM continually monitors voltage signals and pressure readings of the EVAP systems. The EVAP will set fault code P0498 if it detects a low voltage signal within the circuit or vent valve.
Vehicles susceptible to the P0498 fault code include but are not limited: various Honda, Acura and Saturn models as well as Mercedes-Benz, Saab or Suzuki models.
What causes the P0498 Fault code?
Here are some reasons why P0498 should be set.
- – Defective EVAP vent valve
- – Defective purge control solenoid/valve
- – Canister canisters that are clogged or broken
- – Damaged, corroded, shorted, melted, or damaged cables and/or connections
- – Cracked or incorrectly seated fuel filler cap
- – Vacuum or fuel hoses that are cracked or broken
- – Defective EVAP pressure sensor
- – Open the vent valve fuse
- – The PCM/ECM has a problem or must be reprogrammed. This is rare.
What are the symptoms of P0498 Malfunction Code?
These symptoms may be present in vehicles with code P0498.
- Illumination of the check engine light
- – Sometimes, additional fault codes related to EVAP systems can be set alongside P0498.
- Sometimes, the fuel system is not able to be bled and it might not be possible to fill up the fuel tank.
- Depending on the nature and extent of the problem, there may be a strong fuel smell.
- – It is possible to observe a slight increase in fuel consumption.
- Engine performance may be affected.
How to Fix the P0498 Fault Code
Many Honda models, particularly the Civic, Accord, and Element, are susceptible to EVAP valve failure. A thorough circuit diagnosis is recommended. However, replacing the valve can resolve the problem.
Mice are a common cause of electrical problems. Mice can easily cause damage to the EVAP system, as it is mostly exposed.
There are several repairs that can resolve the P0498 fault code.
- – Inspection, testing, and, if required, replacement of the EVAP Vent Valve
- – Repairing/replacing damaged connectors and cables
- – Replace blown fuse (blown fuses are a sign that there is a bigger problem with your vehicle)
- Correct installation of the fuel cap and replacement if damaged
- – Replacing a defective purge control solenoid valve or valve
- – Clean the canister canister that is clogged
- Repairing or replacing a broken or cracked canister canister
- – Repairing damaged or cracked vacuum or fuel lines
- – Replacing a faulty EVAP sensor
How serious is the P0498 Fault code?
Fault code 0498 is not a serious problem, and should not have any impact on vehicle operation. It can, however, cause vehicle failure by failing to repair it.
