P0EF2

Code

Generic P — Powertrain

Drive Motor C Temperature Sensor Range/Performance

Brand: Generic

Type: P — Powertrain

Views: UK: 24 EN: 31 RU: 22

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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

Confirm P0EF2 is active and record freeze-frame data and any related codes.
Visually inspect Drive Motor C connector and harness for obvious damage, corrosion, water, or loose pins. Repair as needed.
With ignition off, disconnect connector and check continuity between sensor pins and control module input; verify no short to ground/battery.
Measure sensor resistance at ambient and compare to manufacturer curve. If sensor is NTC, resistance should drop as temperature rises.
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.
If readings are out of spec, replace the Drive Motor C temperature sensor and retest.
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.
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.
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