Error code

OBD2 P0496

OBD2P0496
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Evaporative Emission System High Purge Flow.

Severity

moderateCan drive, but expect reduced performance and fuel efficiency.

Summary

P0496 indicates high purge flow in the evaporative emission system (EVAP), which can be caused by issues with the EVAP valve or related wiring.

Symptoms

  • Diminished fuel economy
  • Low power
  • Poor acceleration

Common Causes

  • Stuck-open purge valve due to corrosion or contamination
  • Charcoal canister leaks leading to carbon deposits in the purge valve
  • Wiring issues causing a short-to-power condition

Diagnosis

  1. Disconnect the EVAP hose while engine is running to check for vacuum.
  2. Use a vacuum tester to measure vacuum at the purge valve port.
  3. Inspect the purge line for charcoal flakes indicating canister leakage.
  4. Check wiring between ECM and purge valve with DVOM.

Fixes

  • Clean or replace the purge valve if it is stuck open.
  • Replace the charcoal canister if there are leaks or carbon deposits.

FAQ

What should I do if my car has P0496?

Start by checking the purge valve and related wiring. If issues persist, consider replacing parts like the charcoal canister or purge valve.

Can I drive with P0496?

Yes, but expect reduced fuel efficiency and possibly poor performance until the issue is resolved.

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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