Drive Motor Inverter Temperature Sensor Circuit High
The P0AF5 code indicates that the powertrain control module (PCM) has detected a voltage signal from the drive motor inverter temperature sensor that is higher than the expected range. This sensor monitors the temperature of the inverter, which converts DC battery power to AC for the electric motor. A high circuit condition typically means the sensor signal is stuck at a high voltage, possibly due to a short to power, a faulty sensor, or wiring issues. This can lead to inaccurate temperature readings, potentially causing the inverter to overheat or the vehicle to limit power to protect components.
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced motor power or performance
- Overheating of the inverter or motor
- Vehicle may enter limp mode
2. Most Common Causes
- Faulty or out-of-range inverter temperature sensor 'B'
- Short to voltage in the sensor circuit
- Excessive resistance or open circuit in the sensor wiring
- Corroded, damaged, or loose electrical connections in the inverter harness
- Faulty inverter control module or powertrain control module (PCM)
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all codes and freeze frame data.
Step 2: Visually inspect the inverter temperature sensor and its wiring for damage, corrosion, or loose connections.
Step 3: Measure the sensor signal voltage with a multimeter; compare to manufacturer specifications.
Step 4: Check for shorts to power or ground in the sensor circuit.
Step 5: If wiring is intact, replace the temperature sensor and clear the code.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code, as it can lead to inverter overheating and potential damage. The vehicle may limit power, but continued driving could cause component failure.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the sensor price and accessibility. Diagnostic fees may add $50-$100.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.