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Home / Codes / P2402
DTC code page

P2402: EVAP Leak Detection Pump Control Circuit High

Quick answer: The leak detection pump control circuit is reading higher than expected.

Drivers also search this fault as EVAP leak detection pump circuit high, leak detection pump control high, EVAP pump control circuit high.

Severity: medium Family: powertrain Related paths: 12
Meaning

What P2402 usually means

P2402 is the high-circuit side of the leak-detection pump branch. The ECU sees the control signal stuck high or higher than it should be, which usually points to an open circuit, short to power, or a pump/control problem that keeps the EVAP self-test hardware from behaving normally. This is one of those codes that makes people chase leaks when the monitor hardware itself is the thing failing.

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

  • Inspect connector integrity and harness routing at the EVAP pump before replacing the pump itself.
  • Ask whether the main complaint is readiness failure, repeated CEL return, or a true fuel smell because that keeps the diagnosis grounded.
  • Check for companion EVAP circuit codes that may show the fault is electrical rather than leak-related.
Driving risk

Can you keep driving?

P2402 is usually more of an emissions and monitor problem than an immediate drivability risk, but it can block inspection readiness and confuse leak diagnosis until the circuit fault is fixed.

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 control circuit shorted to voltage
  • Open circuit causing an implausibly high control state
  • Failed leak detection pump
  • Connector damage or poor terminal contact
  • Control module or driver issue in less common cases

Cause phrases often tied to this code: short to power, open circuit, bad leak detection pump, rear EVAP harness fault, pump control state stuck high.

Diagnostic order

Suggested workflow

  1. Read freeze-frame and determine when the EVAP monitor flagged the fault.
  2. Check the control circuit for short-to-power or open conditions.
  3. Inspect the pump connector, terminal tension, and evidence of water intrusion.
  4. Command the pump if possible and observe whether the circuit responds rationally.
  5. After repair, verify the EVAP monitor can complete and stay complete.
Avoid guesswork

Common mistakes

  • Calling it a vapor leak without checking the pump circuit first.
  • Ignoring an open circuit because the code says high rather than open.
  • Stopping after the light clears once, before readiness confirms the repair.
Repair path

Practical fix guidance

  • Repair the high-circuit cause: wiring, connector, pump, or control issue.
  • Then let the EVAP monitor rerun so the repair is judged on a real self-test, not only on a cleared code.
  • If the system then fails a leak test, continue into hose, cap, and canister diagnosis separately.
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 P2402

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

  • EVAP leak detection pump circuit high
  • leak detection pump control high
  • EVAP pump control circuit high
Related search intent

Queries this page can answer naturally

  • P2402 code meaning
  • what does P2402 mean
  • EVAP leak detection pump high circuit
  • P2402 monitor not ready
FAQ

Quick questions about P2402

Can P2402 happen with no obvious fuel smell?

Yes. It often affects EVAP self-test control more than day-to-day smell or drivability.

Why can smoke testing look normal with P2402?

Because the hardware that runs or supports monitor logic may be failing electrically even if no obvious hose leak is present.

Does P2402 mean the pump is definitely bad?

No. Wiring and connector faults are common and should be tested first.