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Home / DTC / P0E27 — Drive Motor Inverter Temperature Sensor G Circuit Intermittent/Erratic

P0E27 — Drive Motor Inverter Temperature Sensor G Circuit Intermittent/Erratic

Detailed page for trouble code P0E27.

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P0E27

Generic P — Powertrain

Drive Motor Inverter Temperature Sensor G Circuit Intermittent/Erratic

Brand: Generic
Type: P — Powertrain
Views: UK: 8 EN: 16 RU: 10
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Page language: EN

Causes

  • Damaged, chafed, or broken wiring harness to sensor
  • Poor connector mating, corrosion, bent or loose pins
  • Intermittent internal failure in the temperature sensor (NTC/thermistor or integrated sensor)
  • Poor or intermittent reference voltage or ground at the sensor
  • Water ingress or contamination at connector or sensor
  • Intermittent ECU/inverter input pin fault or internal electronics fault

Symptoms

  • MIL / EV system warning lamp illuminated
  • Intermittent inverter derate, reduced drive power or limp behavior
  • Loss or reduction of regenerative braking
  • Inaccurate or fluctuating inverter temperature reading in live data
  • Faults clear with key cycles but reappear while driving

What to check

  • Read stored and pending DTCs and note freeze-frame data and occurrence conditions
  • Monitor live data for Drive Motor Inverter Temperature Sensor G and adjacent sensor channels
  • Perform wiggle test on harness/connectors while monitoring live data for intermittent changes
  • Visually inspect connectors and harness for corrosion, water, damage, or rubbing points
  • Backprobe connector to confirm reference voltage (typically 0–5 V reference), signal voltage swing, and ground continuity
  • Measure sensor resistance vs temperature (if passive NTC) and compare to expected behavior

Signal parameters

  • Sensor type: typically an NTC thermistor or integrated temperature sensor (varies by manufacturer)
  • Expected signal voltage range (generic): ~0.1–4.9 V depending on temperature (verify OEM spec)
  • Typical cold/high resistance: higher voltage (e.g., 3.0–4.5 V) ; hot/low resistance: lower voltage (e.g., 0.2–1.5 V) — confirm with OE chart
  • Reference supply: usually a stable 5 V or 3.3 V reference from inverter/ECU (check with scan tool / wiring diagram)
  • Intermittent fault: signal may jump, drop to 0 V (short to ground), or go to full reference (open circuit)

Diagnostic algorithm

  1. Record codes, freeze frame and battery/inverter status. Do not assume final diagnosis from one trip; note when code sets.
  2. With a capable scan tool, monitor the Drive Motor Inverter Temperature Sensor G value and watch for intermittent/erratic changes while performing a test drive or static wiggle tests.
  3. Visually inspect the sensor, connector, and harness routing for damage, heat exposure, or moisture. Repair any obvious damage.
  4. With ignition off and following vehicle high-voltage isolation procedures, disconnect the sensor connector and inspect terminals for corrosion, bent pins, or contamination.
  5. Backprobe the sensor connector with ignition on (follow HV safety) to confirm reference voltage and ground presence. Check for a stable reference (typically 3.3/5 V) and a reasonable signal voltage.
  6. Measure sensor resistance at the connector (or across sensor pins) and compare to OEM resistance vs temperature chart. Warm the sensor slowly (hair dryer/hot air) and confirm predictable resistance/voltage change.
  7. Perform continuity and insulation checks on wiring between sensor and inverter/ECU. Wiggle harnesses to reproduce the fault while monitoring signal.
  8. If wiring and connectors are good but signal remains erratic, substitute a known-good sensor (if available) or replace the sensor and retest.
  9. If replacement sensor does not clear intermittent, test at the inverter/ECU input pin for intermittent connection or internal fault; consult manufacturer guidance for inverter module repair or replacement.
  10. Clear codes, perform road test/repeat test conditions to verify repair. If intermittent and not reproducible, leave vehicle for extended road test or stress tests to confirm.

Likely causes

  • Corroded/loose connector at the inverter or sensor
  • Broken or chafed wire in harness causing intermittent contact when moved
  • Failed temperature sensor element (thermistor open or intermittent)
  • Faulty ground or reference voltage to the sensor

Fault status

⚠️ Status
Intermittent/erratic signal from Drive Motor Inverter Temperature Sensor G circuit; may cause inverter derate or disable until fault cleared/ repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

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P0113 P0118 P0128 P0193 P0A6F
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