Error code

OBD2 P0497

OBD2P0497
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Evaporative Emission System Low Purge Flow.

Severity

moderateCan drive but may experience symptoms like hard starting and rough idling.

Summary

P0497 indicates a low purge flow in the evaporative emission (EVAP) system, which captures and stores fuel vapors to prevent them from escaping into the atmosphere.

Symptoms

  • Hard starting after refilling the fuel tank
  • Difficulty filling the fuel tank
  • Fuel odor present
  • Rough idling or fluctuating idle after refueling
  • Engine hesitation upon acceleration for the first few miles after refueling

Common Causes

  • Damaged, burnt, shorted, disconnected, or corroded wiring and 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

Diagnosis

  1. Record all fault codes and freeze frame data.
  2. Inspect wiring, connectors, and vacuum lines for damage or blockages.
  3. Perform electrical tests on relevant components using a multimeter.
  4. Test the vent valve and charcoal canister for obstructions or malfunctions.

Fixes

  • Repair or replace damaged wiring, connectors, and vacuum lines.
  • Replace defective vent valve or purge valve if necessary.
  • Clean or replace the charcoal canister if clogged.

FAQ

Can disconnecting the battery clear this code?

No, disconnecting the battery does not resolve the root cause of P0497 and may damage the PCM.

What tools are needed for diagnosis?

A digital multimeter, hand-held vacuum pump with gauge, repair manual, and possibly a scanner to test valve operation.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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