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Home / DTC / P0EF5 — Drive Motor C Temperature Sensor Circuit Intermittent/Erratic

P0EF5 — Drive Motor C Temperature Sensor Circuit Intermittent/Erratic

Detailed page for trouble code P0EF5.

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P0EF5

Generic P — Powertrain

Drive Motor C Temperature Sensor Circuit Intermittent/Erratic

Brand: Generic
Type: P — Powertrain
Views: UK: 10 EN: 20 RU: 12
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Page language: EN

Causes

  • Loose, corroded, or damaged connector at the drive motor C temperature sensor
  • Chafed or broken wiring in the sensor harness causing intermittent contact
  • High-resistance connection or poor ground
  • Water intrusion or contamination in connector
  • Failing temperature sensor (thermistor)
  • Intermittent short to battery voltage or to ground

Symptoms

  • Malfunction Indicator Lamp (MIL) or dashboard fault message illuminated
  • Intermittent or flashing temperature readings for drive motor C in live data
  • Possible reduced propulsion power or torque limit (limp mode) during fault
  • Reduced regenerative braking or altered cooling/fan behavior
  • Fault stores with intermittent/freezeframe data; may be hard to reproduce

What to check

  • Read and record freeze frame and live data for drive motor C temperature during different driving conditions
  • Scan for additional related codes (other motor temperature circuits, inverter faults, communication errors)
  • Visually inspect sensor connector, pins, and harness along entire run for damage, corrosion, moisture, or rubbing points
  • Wiggle harness and connectors while watching live data to reproduce intermittent behavior
  • Check reference voltage/signal voltage and ground at the sensor connector with key on
  • Measure resistance of the temperature sensor (with sensor disconnected) and compare to specification at ambient temperature

Signal parameters

  • Sensor type: typically NTC thermistor (resistance decreases as temperature rises)
  • Typical signal: sensor is read via pull-up/pull-down — expected signal voltage normally in the 0.5–4.5 V range depending on design
  • Resistance guideline (varies by design): roughly 1–10 kΩ at ~20–25 °C (consult vehicle-specific spec)
  • Open circuit: very high resistance or signal near supply/rail voltage depending on circuit
  • Short to ground: signal near 0 V; short to battery: signal near battery voltage

Diagnostic algorithm

  1. Connect a capable scan tool. View live data for drive motor C temperature and log values while varying engine/drive conditions and while moving harness/connectors (wiggle test).
  2. Inspect the sensor connector and harness visually. Look for corrosion, bent pins, water, or burn damage. Repair or clean as required.
  3. With ignition on, back-probe the sensor connector. Verify correct reference voltage (if present), signal voltage behavior, and a good ground. Note intermittent changes while moving connector.
  4. With sensor disconnected, measure sensor element resistance at ambient temperature. Compare to vehicle manufacturer specification or expected NTC curve. If outside expected range, replace the sensor.
  5. Check continuity and resistance between the sensor connector and the drive/controller connector to find intermittent opens or high resistance. Wiggle harness during test to reproduce intermittent faults.
  6. If wiring and sensor test good, check for intermittent short to battery or ground (insulation faults).
  7. If all wiring and sensor are good and intermittent behavior persists, suspect internal controller/inverter fault. Consult manufacturer service information for internal diagnostics and repair/reprogramming options.
  8. After repairs, clear codes and perform a road test and durability run to confirm the fault does not return.

Likely causes

  • Intermittent connector contact at sensor or controller
  • Broken or partially severed conductor in harness (intermittent with movement or temperature)
  • Corroded terminal(s) causing variable resistance
  • Failed thermistor element inside motor/inverter assembly
  • Intermittent internal fault in drive/controller module

Fault status

⚠️ Status
Drive Motor C Temperature Sensor Circuit — Intermittent/Erratic. Stored freeze-frame/live data may show sporadic or fluctuating temperature values. MIL illuminated; possible limp-home mode or reduced system functionality.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours

Similar codes

P0EF0 P0EF1 P0EF2 P0EF3 P0EF4 P0EFA
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