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, open circuit, or a faulty sensor. This can lead to inaccurate temperature readings, potentially causing the inverter to overheat or the vehicle to limit power to protect components.
01. Most Common Causes
- Faulty drive motor inverter temperature sensor
- Short to voltage in the sensor circuit
- Open or high resistance in the sensor circuit
- Corroded or damaged connector at the inverter
- Faulty PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced motor power or limp mode
- Overheating of the inverter
- Poor acceleration or performance
- Possible warning messages on dashboard
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to read the code 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 resistance and compare to manufacturer specifications; replace if out of range.
Step 4: Check for short to voltage or ground in the sensor circuit using a multimeter.
Step 5: If all else is fine, test the PCM for proper operation or reprogram if necessary.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code, as it can cause the inverter to overheat and potentially fail, leading to loss of power or damage to the electric drive system.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and sensor replacement, but could be higher if the inverter or PCM needs replacement.