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Home / DTC / P0115 — engine coolant temperature sensor intermittent irregular 1 - circuit

P0115 — engine coolant temperature sensor intermittent irregular 1 - circuit

Detailed page for trouble code P0115.

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Code

P0115

LAND ROVER P — Powertrain

engine coolant temperature sensor intermittent irregular 1 - circuit

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

Causes

  • Damaged or corroded ECT sensor connector
  • Broken, chafed or shorted wiring in the ECT circuit
  • Loose or poor ground related to the sensor circuit
  • Faulty engine coolant temperature sensor (intermittent internal fault)
  • Intermittent connection at ECM/PCM pin
  • Coolant intrusion/corrosion at sensor connector or sensor body

Symptoms

  • Check Engine Light (MIL) illuminated, intermittent or steady
  • Inconsistent coolant temperature reading on scan tool (jumps, drops, freezes)
  • Hard cold/hot start or poor idle until correct temp is read
  • Reduced fuel economy or increased emissions
  • Cooling fan or thermostat operation not matching expected temperature readings

What to check

  • Read freeze frame and readiness status with a scan tool; note operating temperature when code set
  • Monitor live ECT sensor data for jumps, dropouts or unrealistic values while gently moving wiring/connector (wiggle test)
  • Visually inspect sensor connector and wiring for corrosion, damage, loose pins, or coolant contamination
  • Backprobe or measure ECT signal voltage with key ON engine OFF and while warming the engine
  • Measure sensor resistance vs temperature with sensor removed and compare to specification in the Land Rover service data
  • Check continuity and insulation of the harness between the sensor and ECM; inspect ECM connector pins for corrosion or damage

Signal parameters

  • ECT thermistor-type sensor: resistance decreases as temperature increases (NTC behaviour)
  • Expected behaviour: high resistance when cold, low resistance at operating temperature; consult vehicle service data for exact ohms-vs-temperature chart
  • Open-circuit condition: very high resistance (>>100 kΩ) or no signal
  • Short-to-ground: near 0–5 Ω or signal pinned low
  • Typical sensor circuit voltage range (signal): ~0.1–4.9 V depending on temperature (near 5 V when cold, near 0 V when hot on common pull-up circuits)
  • ECM reference voltage to sensor circuit: typically ~5 V (verify with manufacturer data)

Diagnostic algorithm

  1. Connect a scan tool and record freeze frame/live ECT values; note if values are intermittent or out-of-range
  2. Visually inspect the ECT sensor, connector and harness for corrosion, damaged insulation, or coolant ingress; repair or replace damaged wiring/connectors
  3. With key ON (engine OFF) backprobe the signal and reference pins: verify reference voltage (usually ~5 V) and good ground; note signal voltage (should change with temperature)
  4. Perform a wiggle test on the harness and connector while watching live data to reproduce intermittent behaviour
  5. Remove the sensor and measure resistance at known temperatures; compare to factory chart. Replace sensor if out of specification or intermittent
  6. If sensor and connector check good, perform continuity and insulation resistance checks from sensor connector to ECM connector; repair any open/shorts
  7. If wiring and sensor are good but problem persists, swap with a known-good sensor or connector (if available) and re-test; consider ECM input circuit test or replacement only after wiring and sensor excluded
  8. Clear codes and perform test drive/drive cycles to confirm the fault is resolved
  9. If intermittent and not reproduced, add monitoring or a data logger; intermittent wiring faults often require repeated wiggle testing and inspection

Likely causes

  • Corroded sensor connector causing intermittent contact
  • Wire insulation abrasion causing intermittent short to ground or 12 V
  • Sensor internal intermittent failure (works then fails)
  • Poor ground or loosened engine ground strap affecting sensor reference
  • Connector terminal pulled out or partially disconnected
  • Coolant leaking into connector or sensor body causing varying resistance

Fault status

⚠️ Status
P0115 — Engine Coolant Temperature (ECT) Sensor Circuit Intermittent/Irregular (Bank 1). ECM detected an inconsistent or intermittent temperature signal from the ECT circuit which may cause incorrect engine temperature information.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0116 P0117 P0118 P0128 P0114
320

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