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Home / DTC / P0E2C — Drive Motor Inverter Temperature Sensor H Circuit Intermittent/Erratic

P0E2C — Drive Motor Inverter Temperature Sensor H Circuit Intermittent/Erratic

Detailed page for trouble code P0E2C.

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P0E2C

Generic P — Powertrain

Drive Motor Inverter Temperature Sensor H Circuit Intermittent/Erratic

Brand: Generic
Type: P — Powertrain
Views: UK: 7 EN: 16 RU: 8
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Page language: EN

Causes

  • Corroded, loose or damaged sensor connector
  • Broken or chafed wiring, intermittent open/short to voltage or ground
  • Faulty temperature sensor (thermistor) inside inverter/motor assembly
  • Poor ground or reference voltage to the sensor
  • Intermittent internal fault in inverter/control module
  • Moisture intrusion or contamination at connector

Symptoms

  • Malfunction Indicator Lamp (MIL)/warning message related to hybrid/EV system
  • Drive system derate, reduced available power or limp mode
  • Intermittent or spiking inverter temperature readings in live data
  • Inverter cooling fan or thermal management behaving unusually
  • Possible loss of EV drive mode or reduced regenerative braking
  • Sometimes no drivability symptom if fault is intermittent

What to check

  • Use OEM scan tool: read freeze frame, pending/fault history and monitor live inverter temperature PIDs (sensor H and related channels).
  • Visual inspection of inverter/motor connectors and harness for damage, corrosion, water entry, pin push-out.
  • Wiggle test: monitor live data while wiggling harness/connectors for intermittent change.
  • Backprobe sensor connector: verify reference voltage, ground continuity and signal voltage while operating.
  • Measure sensor resistance (if serviceable) vs ambient temperature and compare to specification.
  • Check for related codes (other inverter temp sensors, CAN or inverter internal faults).

Signal parameters

  • Sensor type typically a thermistor (NTC or similar): resistance changes with temperature (resistance usually decreases as temperature rises).
  • ECU/sensor signal typically in 0–5 V range; stable, slowly changing voltage with temperature; erratic spikes or rapid jumps indicate a fault.
  • Reference/return: expect stable reference voltage (often 5 V or sensor-specific reference) and a good low-resistance ground.
  • Continuity from sensor connector to inverter/ECU should be low resistance with no intermittent opens; no short to battery voltage or ground.

Diagnostic algorithm

  1. Safety first: follow high-voltage system safety procedures — disable HV system or remove service disconnect where required before working on inverter/harness. Use PPE and HV-rated tools.
  2. Connect a manufacturer-level scan tool, clear codes, then recreate conditions; capture freeze frame and live data focusing on inverter temp sensors including the H channel.
  3. Perform a visual inspection of the inverter connector, sensor harness routing, strain reliefs, and grommets. Look for corrosion, bent pins, crushed wires, or water ingress.
  4. With HV system disabled as required, disconnect the sensor/inverter connector and inspect pins. Clean or repair corroded pins. Reconnect and re-test.
  5. Backprobe the sensor signal, reference, and ground with the vehicle powered (follow safety precautions). Verify stable reference voltage and ground; observe signal while warming/cooling sensor or while operating vehicle.
  6. Wiggle harness and connectors while monitoring live PID to locate intermittent open/shorts. Use a scope to observe fast transients or noise on the signal if available.
  7. If sensor is removable/serviceable: measure resistance versus temperature and compare to manufacturer spec. Replace sensor if out of spec or if resistance is erratic.
  8. Check harness continuity and insulation: perform resistance checks from connector to controller/inverter pins; check for shorts to battery or ground.
  9. If wiring and sensor check good, suspect inverter/control module internal fault. Verify for technical service bulletins and software updates before replacement.
  10. After repairs, clear codes, perform functional tests and road test to confirm the fault does not return. Re-scan to verify no related DTCs persist.

Likely causes

  • Connector corrosion/poor contact at sensor or inverter harness
  • Damaged wiring harness (chafe, break, rodent damage) causing intermittent connection
  • Faulty temperature sensor inside inverter (age or heat damage)
  • High resistance ground or reference feed to inverter/controller
  • Intermittent fault in inverter electronics or ECU

Fault status

⚠️ Status
Drive Motor Inverter Temperature Sensor H circuit intermittent/erratic — inspect sensor, wiring, and inverter connections.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

P0E2A P0E2B P0E2D P0118 P0115
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