Drive Motor Inverter Phase W Over Temperature
The P0C16 code indicates that the temperature sensor for Phase W of the drive motor inverter has detected excessive heat. This inverter converts DC battery power to AC for the electric motor. Overheating can be caused by high current draw, cooling system failure, or a faulty sensor. If ignored, it may lead to inverter damage or reduced motor performance.
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced motor power or limp mode
- Overheating warning on dashboard
- Possible unusual smells from inverter area
2. Most Common Causes
- Coolant pump failure or low coolant level
- Faulty inverter temperature sensor
- High motor load or extended heavy acceleration
- Blocked or restricted coolant flow to inverter
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and check freeze frame data.
Step 2: Inspect coolant level and condition; check for leaks.
Step 3: Verify coolant pump operation and flow to inverter.
Step 4: Test inverter temperature sensor resistance and compare to specs.
Step 5: Check for any obstructions in cooling lines or radiator.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with an overheating inverter can cause permanent damage to the inverter or motor. If the vehicle enters limp mode, drive cautiously to a repair shop.
How much does it cost to fix?▼
Typical repair costs range from $50 to $150 for diagnostics and minor fixes like coolant top-up or sensor replacement. Major repairs like inverter replacement can exceed $1,000.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.