P2401
System
Powertrain (EVAP)
Scanner required
Enhanced OBD2 scanner (live data graphs, freeze frame, battery voltage test)

EVAP System Leak Detection Pump Control Circuit Low

Understand P2401, common causes, and the right SEAFLO pump to diagnose it.

EVAP leak detection pump control circuit low — distinct from DPF on some platforms; also used as emissions pump circuit on Asian imports.

Common symptoms

  • Check engine light
  • EVAP monitor not ready

Typical causes

  • Short in LDP circuit
  • Failed leak detection pump
  • ECU driver fault

What scanner do you need?

Enhanced OBD2 scanner (live data graphs, freeze frame, battery voltage test)

Use live data and freeze frame to confirm the fault before replacing parts. ABS, SRS, and network U-codes usually require a full-system scanner.

Diagnostic tips

  • Record freeze frame data when the code first sets
  • Clear the code only after fixing the root cause
  • Check for related pending codes that point to a common issue
  • Verify battery voltage is above 12.4V before chasing sensor codes

Frequently asked questions

Can I diagnose P2401 with a basic code reader?
P2401 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Is it safe to drive with P2401?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.