P0497 Code - Evaporative Emission System Low Purge Flow

What Does P0497 Mean?

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.

What are the common causes of P0497 ?

Most common causes of P0497 are much the same across all manufacturers, and these could include the following-

• Damaged, burnt, shorted, disconnected, or corroded wiring and or connectors
• Kinked, restricted, plugged, cracked, split, dislodged, or perforated vacuum lines
• Defective/restricted vent valve
• Defective/restricted purge valve
• Defective, clogged, or plugged charcoal canister
• Liquid fuel in the charcoal canister
• Failed, or failing PCM. Note that this is a rare event, and the fault must be sought elsewhere before any controller is replaced.

How do you troubleshoot P0497 ?

While fuel economy was increased, acceleration was seriously compromised, and the loss of engine vacuum led to a dangerous loss of braking assist when the P0497 code system was in four-cylinder mode. In addition to these issues, while the company proposed a hydraulically controlled system that could be switched from within the car, the version they implemented had to be manually changed in the engine compartment using hand tools.



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