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What does Error Code P0497 mean?

Low Issue
DTC Code P0497 indicates an Evaporative Emission System Low Purge Flow issue, where the Engine Control Module (ECM) detects pressure in the EVAP system during a non-purge condition, suggesting the Purge Control Solenoid Valve (PCSV) is not operating within factory specifications.

What are the symptoms of Error Code P0497?

  • Engine Light ON: The check engine light or service engine soon warning light illuminates, indicating a potential issue with the evaporative emission system.
  • Poor Fuel Economy: A decrease in fuel efficiency may be observed, potentially linked to issues in the evaporative emission system affecting fuel vapor management.
  • Rough Idle: The engine may experience a rough idle due to improper fuel vapor purge flow, which can disrupt the air-fuel mixture.

What causes Error Code P0497?

  • The Purge Control Solenoid Valve (PCSV) may be malfunctioning, leading to inadequate control of the evaporative emission system's purge flow.
  • An open or shorted harness in the PCSV can disrupt the electrical signals necessary for proper valve operation.
  • Poor electrical connections in the PCSV circuit can result in intermittent or weak signals, affecting the valve's performance and causing low purge flow.
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How to fix Error Code P0497?

  • Check Technical Service Bulletins (TSB): Review TSBs for your vehicle model to identify any known issues and fixes related to DTC P0497.
  • Perform Visual Inspection: Inspect all system wiring, connectors, vacuum lines, and hoses for damage. Repair or replace as necessary.
  • Use Smoke Machine for Leak Detection: Utilize a smoke machine to identify leaks in the EVAP system. Ensure vacuum lines are plugged before applying smoke.
  • Retrieve and Record Codes: Connect a diagnostic scanner to retrieve stored codes and freeze frame data. Record this information for reference.
  • Clear Codes and Test Drive: Clear all codes and conduct a test drive. Monitor if the code resets after several ignition cycles.
  • Test EVAP Purge Solenoid/Valve: Consult the service manual for specifications. Use a scanner to activate the solenoid and check vacuum flow with the engine running.
  • Check Voltage and Ground Signals: If the solenoid fails to open, verify system voltage and ground signals against manufacturer specifications.
  • Inspect System Circuits: If voltage and ground signals are absent, disconnect controllers and test circuits with a DVOM. Repair or replace as needed.
  • Evaluate PCM: If all components meet specifications, consider a defective PCM or programming error as the cause.
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