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P0497 is a diagnostic trouble code (DTC) for "Evaporative Control System Malfunction". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
P0497 OBD-II Trouble Code: Evaporative Control System Malfunction
The P0497 code, or Evaporative Emission System Low Purge Flow, is indicative of a problem somewhere in the EVAP control system.
When a vehicle sets the P0497 code, it lets you know that there is a fault in the evaporative control system, the system which helps to regulate the amount of fuel vapor that is released into the environment. As the engine runs and fuel is burned, a canister in the EVAP control system stores the excess fuel vapors coming from the gas tank.
The pressure that is built up through this process is vented through a vent line and EVAP vent solenoid, and the vapors are stored in the canister until the engine uses them up. If there is a leak or other fault in the system, the pressure of these products is affected, and the PCM (powertrain control module) will detect a difference in the pressure level. Code P0497 is detected when there is a change in the way this pressure normally flows.
There are several components in the EVAP control system which could trigger a vehicle to throw this code, including:
There may not be any discernible symptoms with this code, beyond an illuminated Check Engine light. However, any EVAP malfunction can affect fuel economy as well as emissions released by the vehicle, which could cause you to fail an emissions test.
Procedures required to pinpoint an EVAP purge flow problem may include:
Because the gas cap is such a simple fix in EVAP purge flow problems, it is often overlooked as a culprit in this code. Checking each possibility, no matter how minor, can help prevent unnecessary and costly repairs.
While the vehicle will typically run with this code, it can cause a drop in fuel efficiency and an increase in emissions released into the atmosphere. It’s best to have the issue addressed as soon as possible.
Repair procedures for this code depend upon what is found by the diagnostic process, and may include:
Even if hoses aren’t damaged or disconnected, they may become kinked, so your technician should check for this issue. When performing a smoke machine test on the system to check for leaks, it is normal for a low flow of smoke to escape the vent in the charcoal canister. Flow codes are often most efficiently diagnosed by beginning inspection at the canister and the surrounding components.
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