Drive Motor Inverter Temperature Sensor Circuit Low
The P0AEF code indicates that the powertrain control module (PCM) has detected a low voltage signal from the drive motor inverter temperature sensor circuit. This sensor monitors the temperature of the inverter, which converts DC battery power to AC for the electric drive motor. A low circuit condition typically means the sensor signal is below the expected range, often due to a short to ground, 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.
01. Most Common Causes
- Faulty drive motor inverter temperature sensor
- Short to ground in sensor circuit wiring
- Open or damaged wiring or connector
- Corroded or loose electrical connections
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced motor power or performance
- Vehicle may enter limp mode
- Overheating of inverter or drive motor
- Possible warning messages on dashboard
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all codes and freeze frame data.
Step 2: Inspect the inverter temperature sensor and its wiring for damage, corrosion, or loose connections.
Step 3: Measure sensor resistance and compare to manufacturer specifications; replace if out of range.
Step 4: Check for shorts to ground or opens in the circuit using a multimeter.
Step 5: If wiring and sensor are okay, test PCM output signals; consider PCM replacement 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 lead to inverter overheating and potential damage. The vehicle may limit power or enter limp mode, which could be unsafe in traffic.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnostic and sensor replacement, but can be higher if wiring repairs or PCM replacement is needed.