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Home / DTC / P0E28 — Drive Motor Inverter Temperature Sensor H Circuit

P0E28 — Drive Motor Inverter Temperature Sensor H Circuit

Detailed page for trouble code P0E28.

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Code

P0E28

Generic P — Powertrain

Drive Motor Inverter Temperature Sensor H Circuit

Brand: Generic
Type: P — Powertrain
Views: UK: 10 EN: 19 RU: 17
AI status
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Page language: EN

Causes

  • Open or shorted temperature sensor wiring (Sensor H)
  • Corroded, loose, or damaged connector or terminal at the sensor or inverter harness
  • Failed temperature sensor (thermistor or sender)
  • Inverter/controller internal wiring or connector fault
  • Water ingress or contamination at connector
  • Intermittent wiring contact or chafed harness shorting to chassis or high-voltage/battery circuits

Symptoms

  • Illuminated MIL / Hybrid system warning lamp
  • Reduced traction or limp-home mode (reduced drive performance)
  • Drive inverter may derate or disable to protect components
  • Possible stored additional hybrid/EV-specific codes
  • Noisy or unusual inverter/motor cooling fan behavior (depending on vehicle)

What to check

  • Scan vehicle for P0E28 and any related codes; record freeze-frame and pending codes
  • Visually inspect inverter area, sensor wiring, and connectors for damage, corrosion, heat damage, or contamination
  • Check connector seating and terminal condition at the inverter and sensor
  • Check for signs of water ingress or physical damage to harness near service panels or bulkheads
  • Measure sensor circuit resistance and compare to expected thermistor behavior (warm vs cold)
  • Measure sensor circuit voltage at the controller connector while monitoring live data (observe that values change with temperature)

Signal parameters

  • Typical temperature sensor type: negative-temperature-coefficient (NTC) thermistor (resistance decreases as temperature increases)
  • Common resistance ranges (example only — verify OEM spec): ~2 kΩ to 20 kΩ at 25°C for many inverter thermistors
  • Common voltage signal: approx. 0.1–4.9 V depending on temperature and sensor design (verify OEM)
  • Open circuit: very high resistance (OL) or voltage near supply rail depending on circuit design
  • Short to ground: near 0 V, short to battery voltage: near battery/ignition voltage

Diagnostic algorithm

  1. Safety first: follow manufacturer high-voltage safety procedures. Disable high-voltage system per service manual before accessing inverter connectors. Only qualified personnel should work on HV components.
  2. Retrieve and record all stored codes and freeze-frame data using a capable scan tool that supports hybrid/EV codes.
  3. Visually inspect the inverter, sensor area, and wiring for damage, loose connectors, corrosion, burn marks, or water contamination.
  4. With HV disabled and service manual procedures followed, disconnect the sensor connector and inspect terminals for corrosion, bent pins, or pushed-out terminals. Repair or replace damaged terminals.
  5. Measure the sensor element resistance at the sensor connector (or at the harness end) at ambient temperature. Compare to OEM spec or expected thermistor behavior. If resistance is open or shorted, replace the sensor.
  6. Check continuity between the sensor connector and the inverter/controller connector, looking for high resistance, opens, or intermittent connection. Repair any wiring faults found.
  7. With appropriate low-voltage power applied per service manual (or using a scan tool live data if safe to do so), monitor sensor voltage while warming or cooling the sensor (by hand or controlled heat source) to verify the signal changes smoothly; abrupt jumps indicate intermittent or faulty wiring/sensor.
  8. Check for shorts to chassis ground and to battery positive on the sensor wiring. Repair insulation or reroute if chafing is found.
  9. If wiring and sensor check good, inspect inverter internal connector or board area for damage. At this stage, consult OEM guidance; inverter/module repair may require factory-level service or replacement.
  10. After repairs, clear codes and perform a road/test or cycling procedure per service manual to confirm the fault does not return.

Likely causes

  • Damaged or corroded connector at the inverter or sensor
  • Open or short in the sensor harness near the inverter
  • Failed temperature sensor element (thermistor)

Fault status

⚠️ Status
Drive Motor Inverter Temperature Sensor H Circuit — Open/Short/Intermittent or Out-of-Range signal detected by inverter controller.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1-4 hours

Similar codes

P0E29 P0E2A P0E2B P0E2C P0E27
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