A faulty temperature sensor or thermistor inside the inverter that incorrectly reports phase W as overheated.; Coolant flow restriction or low coolant level in the inverter cooling circuit, leading to inadequate heat dissipation.; A failing coolant pump or blocked radiator that reduces cooling capacity for the inverter.; Excessive current draw in phase W due to a shorted motor winding or damaged cable, causing abnormal heat generation.; Internal inverter degradation, such as worn thermal interface material or failing power transistors, which increases resistance and heat.; Software calibration issues in the inverter control module that misjudge temperature thresholds.; Corroded or damaged wiring in the temperature sensor circuit, causing erratic readings.

DTC codes / P0Cxx · Hybrid propulsion / P0C13

P0C13Drive Motor A Inverter Phase W Over Temperature

Q: What does code P0C13 mean?

Drive Motor A Inverter Phase W Over Temperature. P0C13 indicates that the inverter responsible for converting direct current to alternating current for drive motor A has detected an over-temperature condition specifically in its phase W output circuit. The computer monitors temperature sensors or calculates heat based on current flow and has determined that phase W is running hotter than the safe limit, which can lead to inverter damage if not addressed.

P0C13 indicates that the inverter responsible for converting direct current to alternating current for drive motor A has detected an over-temperature condition specifically in its phase W output circuit. The computer monitors temperature sensors or calculates heat based on current flow and has determined that phase W is running hotter than the safe limit, which can lead to inverter damage if not addressed.

SystemPowertrain

Code typeGeneric (all makes)

SeverityHigh

Fix difficultyProfessional

AreaHybrid propulsion

Symptoms you may notice

Illumination of the check engine light or a dedicated hybrid/EV warning lamp, often with no other noticeable symptoms.
Reduced power output or a limp-home mode as the vehicle limits current to protect the inverter.
Intermittent loss of propulsion or a sudden shutdown while driving, especially under heavy load.
Audible cooling fan running excessively or continuously after the vehicle is shut off.
Overheating smell or, in severe cases, visible smoke from the inverter area.
Diagnostic trouble codes related to motor performance or inverter communication may also be present.

Common causes, most likely first

A faulty temperature sensor or thermistor inside the inverter that incorrectly reports phase W as overheated.
Coolant flow restriction or low coolant level in the inverter cooling circuit, leading to inadequate heat dissipation.
A failing coolant pump or blocked radiator that reduces cooling capacity for the inverter.
Excessive current draw in phase W due to a shorted motor winding or damaged cable, causing abnormal heat generation.
Internal inverter degradation, such as worn thermal interface material or failing power transistors, which increases resistance and heat.
Software calibration issues in the inverter control module that misjudge temperature thresholds.
Corroded or damaged wiring in the temperature sensor circuit, causing erratic readings.

How to diagnose and fix it

Inspect the inverter coolant level and condition, and top up or replace coolant as needed.
Check for coolant flow by verifying pump operation and looking for blockages in hoses or the radiator.
Use a scan tool to monitor live temperature sensor data for phase W and compare with other phases to identify a faulty sensor.
Perform a resistance and insulation test on the phase W motor cable and windings to rule out a short or ground fault.
Inspect the inverter cooling fan and clean any debris from the cooling fins or ducts.
If sensor and cooling system are healthy, follow the manufacturer's diagnostic flow for inverter internal faults, which may require replacement or reprogramming.
After repairs, clear codes and perform a road test under load to verify the over-temperature condition does not return.

Overheating phase W: look beyond the sensor

A common misdiagnosis is replacing the inverter temperature sensor when the real problem is a partially blocked coolant passage inside the inverter, which only shows up under sustained load.
The code can be set by a failing 12-volt auxiliary battery causing low voltage to the inverter control module, leading to false temperature readings.
Phase W over-temperature often accompanies codes for motor circuit faults or inverter communication errors, so always check for related codes before condemning the inverter.
In some vehicles, the inverter uses a calculated temperature model rather than a direct sensor, so a software update may be required to correct overly sensitive thresholds.
Driving with this code can lead to permanent inverter damage if the over-temperature condition is ignored, even if the vehicle still moves.

Can I keep driving with P0C13?

It is not safe to continue driving with this code because the inverter can overheat and fail completely, leaving you stranded or causing further damage. Limit driving to a short distance to a repair shop and avoid heavy acceleration or high-speed driving that increases current flow and heat.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.