What Does P0C15 Mean?
DTC P0C15 indicates that the Phase V power semiconductor in the drive motor "B" inverter has exceeded its maximum safe operating temperature. This is the Phase V companion to P0C14 (Phase U) and P0C16 (Phase W) for inverter "B". The inverter will derate motor "B" output to prevent thermal damage to the switching device. Diagnosis follows the same pattern as the other inverter over-temperature codes.
Safety Warning
An overheating Phase V IGBT can fail short-circuit or open-circuit, causing loss of motor "B" control or potential inverter fire. Reduced propulsion and asymmetric torque output may compromise vehicle handling.
Common Causes
28%
Inverter "B" coolant pump failure or restricted flow
22%
Degraded Phase V IGBT in the "B" inverter module
20%
Coolant passage blockage in the "B" inverter cold plate
15%
Extended high-torque demand in elevated ambient temperatures
15%
Degraded thermal compound at Phase V mounting surface
Diagnostic Steps
1
Step 1: Review freeze-frame data and compare all three motor "B" inverter phase temperatures. Check if P0C14 and P0C16 are also present — simultaneous codes point to cooling; isolated Phase V points to the IGBT module.
2
Step 2: Verify the coolant pump and flow to inverter "B" are within specification. Check for DTCs related to the power electronics cooling system.
3
Step 3: Perform a controlled load test while monitoring real-time Phase V temperature. Compare its rise rate to Phase U and W temperatures for inverter "B".
4
Step 4: If the cooling system checks out and only Phase V is affected, use infrared thermography on the inverter housing to confirm a localized hot spot near the Phase V module.
5
Step 5: Replace the motor "B" inverter module if Phase V IGBT degradation is confirmed. Flush and fill the cooling circuit with fresh coolant after replacement.
Estimated Repair Cost
$500 - $5,500
Parts + labor, varies by vehicle and location
DTC P0C15 indicates that the Phase V power semiconductor in the drive motor "B" inverter has exceeded its maximum safe operating temperature. This is the Phase V companion to P0C14 (Phase U) and P0C16 (Phase W) for inverter "B". The inverter will derate motor "B" output to prevent thermal damage to ...
The most common cause of P0C15 (Drive Motor "B" Inverter Phase V Over Temperature) is: Inverter "B" coolant pump failure or restricted flow
Typical repair costs for P0C15 range from $500 to $5,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
An overheating Phase V IGBT can fail short-circuit or open-circuit, causing loss of motor "B" control or potential inverter fire. Reduced propulsion and asymmetric torque output may compromise vehicle handling.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0C15 to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid/EV Inverter Thermal Management
Difficulty
Type
Generic (SAE)
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