P2402
System
Powertrain (EVAP)
Scanner required
Enhanced OBD2 scanner (live data graphs, freeze frame, battery voltage test)

EVAP System Leak Detection Pump Control Circuit High

Understand P2402, common causes, and the right SEAFLO pump to diagnose it.

Leak detection pump control circuit open or high.

Common symptoms

  • Check engine light
  • Failed emissions test

Typical causes

  • Open LDP circuit
  • Failed pump motor
  • Blown fuse

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 P2402 with a basic code reader?
P2402 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 P2402?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.