Code Definition

P0496 — Evaporative emission system Purge flow high

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0496

P0496 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0496 is stored, the module has detected a signal or supply voltage lower than the expected operating range; and a signal or supply voltage higher than the expected operating range.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0496 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The Powertrain Control Module (PCM) sets this code when it detects excessive purge flow in the evapourative emissions (EVAP) system. This usually indicates that the purge valve is stuck open, allowing fuel vapours to enter the engine at the wrong time, which can cause rough idle, hard starting, or increased emissions.

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