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Home / DTC / P0C13 — Drive Motor A Inverter Phase W Over Temperature

P0C13 — Drive Motor A Inverter Phase W Over Temperature

Detailed page for trouble code P0C13.

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P0C13

Generic P — Powertrain

Drive Motor A Inverter Phase W Over Temperature

Brand: Generic
Type: P — Powertrain
Views: UK: 13 EN: 29 RU: 18
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Page language: EN

Causes

  • Inverter cooling failure (low coolant, blocked radiator, faulty pump, clogged passages)
  • Cooling fan inoperative or reduced airflow
  • High electrical load or sustained heavy duty cycle (towing, steep grades)
  • Shorted or partially shorted motor windings or inverter semiconductor failure
  • Poor electrical connection or high-resistance connector at phase W
  • Ambient temperature extremely high or vehicle ventilation restricted

Symptoms

  • Warning lamp or HVAC/EV system message indicating inverter/motor over temperature
  • Reduced propulsion power or limp-home mode engaged
  • Loss of drive or intermittent torque interruptions
  • Unusual odors (overheat) or heat felt near inverter area
  • Stored DTC(s) related to inverter temperature, phase faults or cooling system

What to check

  • Read DTCs and freeze-frame data with a high-voltage capable scan tool; note ambient temp, vehicle speed, load and coolant temps
  • Inspect coolant level, hoses, pump operation and radiator/heat exchanger for blockage or leaks
  • Verify cooling fan(s) operation and airflow at inverter area
  • Visually inspect inverter housing, connectors and wiring for damage, corrosion or loose terminals (with proper HV safety procedures)
  • Check for related codes on other inverter phases or motor circuits
  • Monitor live data: inverter temps for all phases, DC bus voltage, motor current, inverter coolant temperature and pump speed

Signal parameters

  • Inverter phase W temperature (live data) — normal varies by vehicle; over-temp threshold typically set by manufacturer (often in the 100–150°C range)
  • Inverter coolant temperature and flow/pump speed
  • Motor current for phase W and total motor current (A)
  • DC bus voltage (V) during event
  • Ambient temperature and vehicle load/speed at fault occurrence
  • Resistance/voltage on phase W temperature sensor circuit

Diagnostic algorithm

  1. Retrieve freeze-frame and full DTC list. Note conditions at time of fault (speed, load, DC bus voltage, coolant temp).
  2. If safe, attempt to reproduce fault under controlled conditions (low speed/high load) while monitoring live data. Take care with high-voltage systems.
  3. Visually inspect inverter area, cooling components and W-phase wiring/connectors for damage, discoloration or loose/oxidized terminals.
  4. Verify coolant level and coolant circuit operation: start vehicle per procedures, confirm pump runs and coolant flows through inverter heat exchanger and that fans engage when required.
  5. Check phase W temperature sensor circuit: measure resistance/voltage compared to other phase sensors and specifications. Replace sensor or repair wiring if out of range.
  6. Measure motor/inverter currents and DC bus voltage during operation; look for excessive current on W phase indicating short or semiconductor failure.
  7. Perform motor winding resistance and insulation tests (megger) to detect shorted/grounded turns or insulation breakdown if permitted and safe.
  8. If wiring, connector or sensor faults are found, repair and retest. If cooling faults found, repair cooling system and retest.
  9. If diagnostics indicate inverter module damage or failed power devices, consult manufacturer procedures for high-voltage module replacement and flash/update software if required.
  10. Clear codes and perform a test drive/operational test under representative load to confirm the fault does not return.

Likely causes

  • Inverter cooling circuit issue (pump, hoses, coolant level) reducing heat removal
  • High-resistance connection or damaged wiring on W phase increasing heat
  • Failed inverter power device on W phase causing localized heating
  • Faulty phase temperature sensor or wiring producing false over-temp

Fault status

⚠️ Status
Drive Motor A inverter phase W temperature exceeded safe threshold. System may reduce power and store fault for protection.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 2-5 hours

Similar codes

P0C10 P0C11 P0C12 P0C14 P0C1A
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