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Home / DTC / P2402 — EVAP System Leak Detection Pump Control Circuit High

P2402 — EVAP System Leak Detection Pump Control Circuit High

Detailed page for trouble code P2402.

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Code

P2402

Generic P — Powertrain

EVAP System Leak Detection Pump Control Circuit High

Brand: Generic
Type: P — Powertrain
Views: UK: 17 EN: 33 RU: 39
AI status
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Page language: EN

Causes

  • Short to battery voltage in the LD (leak detection) pump control circuit
  • Open or corroded connector causing abnormal voltage readings
  • Failed leak detection pump with internal electrical fault
  • Faulty driver in the powertrain control module (PCM/ECM)
  • Blown or incorrect fuse or a stuck relay supplying constant voltage
  • Aftermarket wiring or repairs introducing incorrect connections

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • EVAP system readiness test may fail (vehicle may not set to ready for inspection)
  • Possible inability to perform EVAP leak detection tests
  • In some cases, audible pump operation when it should be off or no pump operation when commanded

What to check

  • Read freeze frame and live data with a scan tool; note conditions when code set
  • Verify ability to command the LD pump ON/OFF from the scan tool and observe symptoms
  • Visually inspect LD pump, wiring, and connectors for damage, corrosion, or aftermarket splices
  • Backprobe the pump control connector and measure voltage with pump commanded ON and OFF
  • Check fuses and relays related to EVAP/leak detection pump power supply
  • Measure pump coil resistance at the connector with harness disconnected (compare to spec)

Signal parameters

  • Expected at connector with PCM commanding OFF: near 0 V (or low reference voltage) on switch/driver side; no battery feed
  • Expected at connector with PCM commanding ON: switched voltage close to battery voltage (~11–14 V) OR driver to ground depending on vehicle design
  • Abnormal condition: voltage higher than expected when commanded OFF or continuously present battery voltage when it should be removed
  • Pump coil resistance (typical range): often 1–50 ohms depending on design — consult vehicle-specific spec

Diagnostic algorithm

  1. Retrieve code, freeze frame and any pending/related EVAP codes; record live data.
  2. Attempt an active test: command the LD pump ON with a scan tool and observe if voltage and current change as expected.
  3. With ignition ON (engine OFF), backprobe the pump control pin. Observe voltage with command OFF and ON. Note if voltage is high when it should be low.
  4. Disconnect the pump harness and measure resistance of the pump coil to ground and between terminals. Compare to spec to check for internal short.
  5. Inspect and test for short to battery: disconnect battery-positive feed circuits or isolate harness sections and recheck voltage on control wire.
  6. Inspect connectors, pins and harness along the circuit for corrosion, melted insulation, chafing or signs of water intrusion. Repair any damage.
  7. Check fuses and relays in the EVAP/LD pump power circuit; replace if faulty. Replace pump if coil resistance or operation is out of spec.
  8. If wiring and pump test good, test PCM driver by checking output with a lab scope or substitute known-good PCM (or consult manufacturer procedures) before replacing PCM.
  9. Clear codes and perform drive cycle/EVAP test to confirm repair. Re-scan and verify readiness monitors.

Likely causes

  • Short to +B on the pump control wire (wire chafed and contacting chassis or a live circuit)
  • Corroded or damaged connector at the LD pump (voltage bleed or poor contact)
  • Leak detection pump internal short or shorted windings feeding back voltage
  • Failed PCM output transistor or internal short in the control driver
  • Fuse or relay stuck closed supplying power when circuit should be off

Fault status

⚠️ Status
EVAP leak detection pump control circuit voltage higher than expected. Check pump, wiring, connector, fuses/relays, and control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

P2400 P2401 P0440 P0441 P0442 P0446
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