Drive Motor Inverter Phase W Over Temperature
The P0C16 code indicates that the inverter for the drive motor's phase W has exceeded its safe operating temperature. This is a critical issue in hybrid/electric vehicles, as the inverter converts DC to AC for the motor. Overheating can be caused by excessive load, cooling system failure, or internal faults. If ignored, it may lead to inverter damage or reduced motor performance.
01. Most Common Causes
- Faulty inverter cooling system (low coolant, pump failure)
- Extended high-load driving (towing, steep grades)
- Internal inverter short or sensor malfunction
02. Symptoms You Will Notice
- Check Engine Light on
- Reduced motor power or limp mode
- Possible warning message on dashboard
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and check freeze frame data.
Step 2: Inspect inverter coolant level and pump operation.
Step 3: Test inverter temperature sensor and wiring.
Step 4: Check for software updates or TSBs for the inverter.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, continued driving may cause inverter damage. Pull over and have the vehicle towed to a shop.
How much does it cost to fix?▼
Diagnosis typically costs $50-$150. Repair costs vary widely; cooling system fixes may be $200-$500, while inverter replacement can exceed $2000.