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DTC code page

P2401: EVAP Leak Detection Pump Control Circuit Low

Quick answer: The ECU sees the leak detection pump control circuit pulled lower than expected.

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

Severity: medium Family: powertrain Related paths: 15
Meaning

What P2401 usually means

P2401 is an EVAP leak-detection pump electrical code. It does not say the car definitely has a simple vapor leak. It says the computer cannot control the pump circuit normally because the control side is reading too low. On vehicles that use a dedicated leak-detection pump to run EVAP self-tests, that can prevent readiness from completing and can make leak codes return even after the gas cap or hoses have been checked.

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

  • Confirm whether the vehicle uses a leak detection pump strategy before testing the wrong EVAP component.
  • Inspect the rear EVAP connector and harness because moisture and road debris commonly attack this area.
  • Check whether EVAP readiness is stuck not-ready or whether other leak codes keep returning with it.
Driving risk

Can you keep driving?

P2401 rarely changes drivability dramatically, but it can keep the EVAP monitor from passing and can mask whether a real leak still exists. It is usually safe short-term, but not smart to ignore before emissions testing.

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 low
  • Failed leak detection pump or pump driver
  • Corroded or loose pump connector
  • Harness damage near the rear EVAP hardware
  • Low control voltage from wiring resistance or module fault

Cause phrases often tied to this code: short to ground, leak detection pump wiring, EVAP pump connector, pump driver fault, corroded EVAP circuit.

Diagnostic order

Suggested workflow

  1. Read freeze-frame and note the conditions when the EVAP monitor failed.
  2. Inspect the leak detection pump connector, wiring, and terminal condition.
  3. Test the control circuit for short-to-ground or excessive voltage drop.
  4. Verify the pump can be commanded if the platform supports bidirectional control.
  5. After repair, complete an EVAP drive cycle and confirm readiness can set normally.
Avoid guesswork

Common mistakes

  • Replacing the gas cap for a pump control-circuit code.
  • Assuming every EVAP code is a hose leak when the circuit itself cannot run the self-test.
  • Judging the repair complete before the EVAP monitor has had a chance to rerun.
Repair path

Practical fix guidance

  • Repair the low-control circuit fault, connector issue, or failed leak detection pump proven by testing.
  • Then re-run or complete the EVAP monitor so you know the system can finally test itself again.
  • If leak codes remain after the circuit repair, continue into smoke testing instead of mixing the two failures together.
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 P2401

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

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

Queries this page can answer naturally

  • P2401 code meaning
  • what does P2401 mean
  • EVAP leak detection pump circuit low
  • P2401 emissions not ready
FAQ

Quick questions about P2401

Is P2401 the same as an EVAP leak?

No. It is a control-circuit problem for the leak detection pump, not a direct accusation that a hose or cap is leaking.

Can P2401 cause EVAP readiness to stay incomplete?

Yes. If the pump circuit cannot run the test properly, the monitor may never set.

Why does P2401 often come back after other EVAP repairs?

Because fixing a cap or hose does not repair the electrical circuit that actually runs the leak test.