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Home / Codes / P2404
DTC code page

P2404: EVAP Leak Detection Pump Sense Circuit Range/Performance

Quick answer: The ECU sees an implausible feedback signal from the leak detection pump circuit.

Drivers also search this fault as EVAP leak detection pump sense circuit performance, leak detection pump range performance, P2404 EVAP sense circuit.

Severity: medium Family: powertrain Related paths: 13
Meaning

What P2404 usually means

P2404 means the EVAP leak detection pump feedback or sense circuit is not behaving in a believable range. The monitor can see the hardware, but it does not trust what the circuit is reporting. That often creates the classic cycle of repeated EVAP returns, incomplete readiness, and shops replacing caps or hoses even though the self-test hardware is giving unreliable feedback.

Fast triage

Start here before chasing parts

  • Scan first: save freeze-frame and pending codes before clearing anything.
  • Confirm the complaint: compare the stored code with current drivability symptoms.
  • Use context: trims, live data, and related codes usually narrow the fault faster than guesswork.
  • Work simplest to hardest: leaks, connectors, maintenance items, and known patterns before expensive components.
Initial checks

What to check first

  • Check whether the complaint is repeated EVAP monitor failure rather than a constant active leak smell.
  • Inspect the pump connector and sense wire condition because this code often lives in the wiring detail.
  • Do not clear the code before recording freeze-frame and readiness status.
Driving risk

Can you keep driving?

P2404 is usually an emissions-readiness problem more than a severe drivability issue, but it can waste a lot of diagnostic time until the EVAP pump feedback path is stable.

Moderate urgency: This code often allows short-term driving, but the right fix usually comes faster when you diagnose it early instead of waiting for more codes.
Likely causes

Common causes behind this code

  • Leak detection pump feedback out of expected range
  • Intermittent or resistive wiring in the sense circuit
  • Connector corrosion or poor terminal grip
  • Failing leak detection pump hardware
  • Control-module interpretation problem after the rest of the circuit is proven good

Cause phrases often tied to this code: biased pump feedback, wiring resistance, intermittent EVAP pump signal, sensor range issue, rear EVAP harness.

Diagnostic order

Suggested workflow

  1. Read freeze-frame and readiness state for the EVAP monitor.
  2. Inspect the leak detection pump connector and wiring for corrosion, chafing, and poor terminal tension.
  3. Test the sense circuit for voltage behavior that matches service expectations.
  4. Compare monitor behavior before and after command tests if the platform allows them.
  5. Validate the repair with a complete monitor run rather than a quick code clear.
Avoid guesswork

Common mistakes

  • Replacing hoses or caps when the monitor feedback path is the real problem.
  • Ignoring intermittent sense-circuit behavior because the code is not a simple high/low electrical fault.
  • Calling the car fixed before readiness is complete.
Repair path

Practical fix guidance

  • Repair the proven sense-circuit, connector, or pump feedback issue first.
  • Then rerun the EVAP monitor to verify the system can evaluate leaks normally again.
  • If a leak code remains after that, separate the true leak diagnosis from the monitor-hardware fault.
Vehicle context

Affected brands in this MVP

Brand hubs help broaden internal linking now and can evolve into make-specific diagnostic notes later.

Aliases and common searches

English phrases tied to P2404

Useful when the driver knows the wording but not the exact DTC yet.

  • EVAP leak detection pump sense circuit performance
  • leak detection pump range performance
  • P2404 EVAP sense circuit
Related search intent

Queries this page can answer naturally

  • P2404 code meaning
  • what does P2404 mean
  • EVAP leak detection pump sense circuit
  • P2404 recurring EVAP fault
FAQ

Quick questions about P2404

What makes P2404 different from P2401 or P2402?

P2404 is a range/performance or sense-circuit problem, while P2401 and P2402 point more directly to low or high control-circuit states.

Can P2404 keep the EVAP monitor from setting?

Yes. If the monitor does not trust the pump feedback, readiness may remain incomplete.

Why is P2404 often misdiagnosed as a leak?

Because the end result is still a failed EVAP self-test, even though the failing piece may be the test hardware itself.