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Home / DTC / P0EF2 — Drive Motor C Temperature Sensor Range/Performance

P0EF2 — Drive Motor C Temperature Sensor Range/Performance

Detailed page for trouble code P0EF2.

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P0EF2

Generic P — Powertrain

Drive Motor C Temperature Sensor Range/Performance

Brand: Generic
Type: P — Powertrain
Views: UK: 12 EN: 20 RU: 13
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Page language: EN

Causes

  • Open or short in the temperature sensor circuit (wiring or connector)
  • Failed or degraded motor temperature sensor (thermistor/RTD)
  • Corroded, loose or contaminated connector at motor or control module
  • Intermittent wiring damage from vibration or abrasion
  • Water ingress or contamination at motor connector
  • Control module (VCU/MCU) input circuit fault or software calibration error

Symptoms

  • MIL/diagnostic lamp illuminated and P0EF2 stored
  • Reduced motor power, derate or limp-home mode to protect motor
  • Inaccurate or frozen motor temperature gauge/telemetry
  • Cooling system (fan/pump) may operate incorrectly due to bad input
  • Possible unexpected charging/regenerative braking behavior tied to motor temp limits
  • Intermittent faults or fault clears after movement/vibration

What to check

  • Retrieve freeze frame and full DTC history; note conditions when fault sets
  • Visually inspect motor C connector, wiring harness, and strain reliefs for damage, corrosion, or water
  • Wiggle-test wiring with engine/motor off to try to reproduce intermittent fault (safely)
  • Measure sensor circuit resistance and compare to manufacturer specification
  • Back-probe the sensor signal with ignition on and compare voltage/resistance to expected behavior over temperature
  • Check for related codes (other motor sensors, CAN/communication faults) that may indicate module or bus issues

Signal parameters

  • Sensor type typically thermistor (NTC) or RTD — resistance should change predictably with temperature; consult vehicle spec for exact curve
  • Typical operating temperature reporting range around -40°C to +150°C depending on vehicle; out-of-range values trigger fault
  • Typical sensor signal voltage range ~0.1–4.9 V (dependent on vehicle circuit); very low or very high voltages indicate short/open
  • Expected update rate: periodic telemetry from motor controller; long signal dropouts or inconsistent updates are abnormal
  • Plausibility checks: signal should not jump abruptly between extremes or remain constant across wide temperature change

Diagnostic algorithm

  1. Confirm P0EF2 is active and record freeze-frame data and any related codes.
  2. Visually inspect Drive Motor C connector and harness for obvious damage, corrosion, water, or loose pins. Repair as needed.
  3. With ignition off, disconnect connector and check continuity between sensor pins and control module input; verify no short to ground/battery.
  4. Measure sensor resistance at ambient and compare to manufacturer curve. If sensor is NTC, resistance should drop as temperature rises.
  5. Reconnect and back-probe signal with ignition on (or per safe diagnostic procedure) and observe voltage behavior while warming motor (or applying controlled heat to sensor) — watch for stable, plausible change.
  6. If readings are out of spec, replace the Drive Motor C temperature sensor and retest.
  7. If sensor tests good but fault remains, inspect and repair wiring between sensor and module; check for intermittent faults with motor running and harness moved.
  8. If wiring and sensor are good, scan and test the vehicle control module input circuit for proper reference/ground and consider module reflash or replacement per manufacturer guidance.
  9. Clear codes, perform a drive or motor run cycle to verify fault does not return and motor thermal management operates normally.

Likely causes

  • Broken or chafed harness between Drive Motor C and vehicle control module
  • Corrosion or bent pins in motor-side connector allowing intermittent contact
  • Faulty thermistor inside the motor assembly due to age or heat exposure
  • Short to ground or battery in sensor signal or reference circuit
  • Aftermarket repair replaced sensor with wrong part or orientation

Fault status

⚠️ Status
Drive Motor C Temperature Sensor Range/Performance — indicates the motor controller detected an implausible or out-of-range temperature signal from Drive Motor C. May cause derate or protective strategies.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0EF0 P0EF1 P0EF3 P0115 P0117 P0118
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