Drive Motor Inverter Temperature Sensor Circuit High
The P0AF0 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 circuit has an open, short to voltage, or a faulty sensor, potentially leading to inverter overheating and reduced performance.
01. Most Common Causes
- Faulty drive motor inverter temperature sensor
- Open or shorted wiring in the sensor circuit
- Corroded or loose connector at the sensor or PCM
- PCM software or hardware issue (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced motor power or limp mode
- Overheating of the inverter or motor
- Poor electric vehicle range or performance
03. 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's resistance and compare to manufacturer specifications; replace if out of range.
Step 4: Check for shorts or opens in the circuit between the sensor and PCM using a multimeter.
Step 5: If wiring and sensor are good, update PCM software or replace PCM as a last resort.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with a high inverter temperature sensor circuit can lead to inverter overheating, reduced power, and potential damage to the electric drive system.
How much does it cost to fix?▼
Typical repair costs range from $50 to $150 for sensor replacement, plus diagnostic fees. Wiring repairs may add $100-$200.