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Home / DTC / P2406 — EVAP System Leak Detection Pump Sense Circuit High

P2406 — EVAP System Leak Detection Pump Sense Circuit High

Detailed page for trouble code P2406.

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11,914generic
22,491specific
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P2406

Generic P — Powertrain

EVAP System Leak Detection Pump Sense Circuit High

Brand: Generic
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or damaged wiring in LDP sense or supply circuit
  • Connector corrosion, bent pins or poor contact at the LDP connector
  • Short to battery voltage on the sense circuit
  • Failed leak detection pump (internal open or short)
  • Blown fuse or faulty relay supplying the pump circuit
  • Poor or missing ground for the pump or module

Symptoms

  • Malfunction Indicator Lamp (MIL) or Check Engine Light illuminated
  • Stored P2406 and/or other EVAP-related DTCs
  • EVAP system leak test may not complete or be disabled
  • Little or no drivability symptoms in many cases
  • Possible fuel odor if unrelated EVAP faults allow vapors to escape (less common)

What to check

  • Read freeze frame and pending codes with a scan tool; note related EVAP codes
  • Perform a thorough visual inspection of LDP wiring, connectors, and harness routing
  • Check fuses and relays for the EVAP/LDP circuit
  • Back-probe the LDP connector to check supply, sense, and ground voltages with key ON and during pump activation
  • Measure resistance of the pump motor between its terminals
  • Wiggle test wiring/connectors while monitoring for voltage changes or codes

Signal parameters

  • Battery voltage to pump supply typically ~11–14.5 V (key ON/run)
  • Sense circuit nominal: low (near 0 V) when pump is driven to ground in some systems; a high reading (several volts or near battery) indicates open/short to battery or disconnected sense
  • Pump coil resistance: typically a few ohms to tens of ohms (manufacturer-specific) — a very high or infinite resistance indicates open circuit
  • Current draw during pump operation: should be consistent with a healthy pump (abnormally high or low draw suggests internal fault)

Diagnostic algorithm

  1. Retrieve DTCs and freeze-frame data; note vehicle conditions when code set.
  2. Inspect LDP connector and wiring for corrosion, damage, pin push-out, or repairs. Repair any visible damage.
  3. Check related fuses/relays; replace if blown or intermittent.
  4. With connector back-probed, measure supply voltage at the pump connector with key ON. Compare to battery voltage.
  5. Command the LDP ON using a scan tool (if supported) while monitoring the sense circuit and ground. Record voltages and current draw.
  6. Measure resistance of the pump motor. If open or out of expected range, replace the pump.
  7. If the sense circuit reads high, check for short to battery on the sense wire (disconnect the pump connector and re-measure the sense lead).
  8. Check ground continuity from pump ground to chassis/PCM ground. Repair poor grounds.
  9. If wiring continuity and connectors are good but the pump behaves abnormally, replace the LDP and retest.
  10. If a new pump and repaired wiring do not clear the code, inspect PCM/EVAP module outputs and inputs or consult OEM diagnostic procedures for module testing.
  11. After repairs, clear codes and perform readiness/EVAP self-test cycles and road test to confirm the issue is resolved.

Likely causes

  • Corroded/loose connector at the leak detection pump
  • Broken wire (open) in the sense or ground circuit
  • Failed LDP (internal electrical fault)
  • Short to battery voltage on the sense lead
  • Faulty fuse/relay supplying the LDP

Fault status

⚠️ Status
EVAP System Leak Detection Pump Sense Circuit High — the EVAP control module is detecting a higher-than-expected voltage on the leak detection pump sense circuit. This signals a possible open, short-to-voltage, pump failure, wiring/connectors issue, or related fuse/relay fault. MIL set.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

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Code

P2406

LAND ROVER P — Powertrain

Leak detection pump sensor by emission system evaporative - high circuit

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or damaged wiring in LDP sense or supply circuit
  • Connector corrosion, bent pins or poor contact at the LDP connector
  • Short to battery voltage on the sense circuit
  • Failed leak detection pump (internal open or short)
  • Blown fuse or faulty relay supplying the pump circuit
  • Poor or missing ground for the pump or module

Symptoms

  • Malfunction Indicator Lamp (MIL) or Check Engine Light illuminated
  • Stored P2406 and/or other EVAP-related DTCs
  • EVAP system leak test may not complete or be disabled
  • Little or no drivability symptoms in many cases
  • Possible fuel odor if unrelated EVAP faults allow vapors to escape (less common)

What to check

  • Read freeze frame and pending codes with a scan tool; note related EVAP codes
  • Perform a thorough visual inspection of LDP wiring, connectors, and harness routing
  • Check fuses and relays for the EVAP/LDP circuit
  • Back-probe the LDP connector to check supply, sense, and ground voltages with key ON and during pump activation
  • Measure resistance of the pump motor between its terminals
  • Wiggle test wiring/connectors while monitoring for voltage changes or codes

Signal parameters

  • Battery voltage to pump supply typically ~11–14.5 V (key ON/run)
  • Sense circuit nominal: low (near 0 V) when pump is driven to ground in some systems; a high reading (several volts or near battery) indicates open/short to battery or disconnected sense
  • Pump coil resistance: typically a few ohms to tens of ohms (manufacturer-specific) — a very high or infinite resistance indicates open circuit
  • Current draw during pump operation: should be consistent with a healthy pump (abnormally high or low draw suggests internal fault)

Diagnostic algorithm

  1. Retrieve DTCs and freeze-frame data; note vehicle conditions when code set.
  2. Inspect LDP connector and wiring for corrosion, damage, pin push-out, or repairs. Repair any visible damage.
  3. Check related fuses/relays; replace if blown or intermittent.
  4. With connector back-probed, measure supply voltage at the pump connector with key ON. Compare to battery voltage.
  5. Command the LDP ON using a scan tool (if supported) while monitoring the sense circuit and ground. Record voltages and current draw.
  6. Measure resistance of the pump motor. If open or out of expected range, replace the pump.
  7. If the sense circuit reads high, check for short to battery on the sense wire (disconnect the pump connector and re-measure the sense lead).
  8. Check ground continuity from pump ground to chassis/PCM ground. Repair poor grounds.
  9. If wiring continuity and connectors are good but the pump behaves abnormally, replace the LDP and retest.
  10. If a new pump and repaired wiring do not clear the code, inspect PCM/EVAP module outputs and inputs or consult OEM diagnostic procedures for module testing.
  11. After repairs, clear codes and perform readiness/EVAP self-test cycles and road test to confirm the issue is resolved.

Likely causes

  • Corroded/loose connector at the leak detection pump
  • Broken wire (open) in the sense or ground circuit
  • Failed LDP (internal electrical fault)
  • Short to battery voltage on the sense lead
  • Faulty fuse/relay supplying the LDP

Fault status

⚠️ Status
EVAP System Leak Detection Pump Sense Circuit High — the EVAP control module is detecting a higher-than-expected voltage on the leak detection pump sense circuit. This signals a possible open, short-to-voltage, pump failure, wiring/connectors issue, or related fuse/relay fault. MIL set.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

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