P2406: Evaporative Emission System Leak Detection Pump Sense Circuit High
What to do
The car drives normally. If anything has recently been done underneath the vehicle, ask for the pump's connector to be checked first — it is easily left unclipped.
What this code means
The pump's sense circuit reads above its valid range — an open circuit, a disconnected connector, or a short to supply. A disconnected pump is common here because the connector sits underneath the vehicle where it is disturbed by exhaust, suspension and fuel tank work.
Likely causes
Start here
- Open circuit in sensor wiring · moderate
- Disconnected sensor connector · easy
- Corroded or loose connector · easy
Less common
- Faulty EVAP leak detection pump · moderate
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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