What Does P0AEA Mean?
The battery management system has detected that hybrid battery temperature sensor D is reporting a voltage below the normal operating range, which corresponds to an abnormally high temperature reading from the NTC thermistor (NTC resistance decreases as temperature increases, pulling voltage lower). This could indicate the sensor is shorted, the wiring has a short to ground, or there is a genuine extreme over-temperature condition in that zone of the battery pack.
Safety Warning
If this fault represents a genuine over-temperature condition, there is a risk of thermal runaway in lithium-ion cells, which can result in fire. Even if it is a sensor fault, the BMS cannot verify thermal safety in that zone. The vehicle should be parked in a safe location away from structures and inspected promptly. Do not charge the vehicle until the cause is confirmed.
Common Causes
30%
Shorted NTC thermistor (internal failure causing very low resistance)
30%
Short to ground in the sensor wiring harness
20%
Water intrusion or contamination at the sensor connector causing low-resistance path
15%
Genuine battery cell over-temperature in the zone monitored by sensor D
5%
Faulty cell monitoring board with input pulled low
Diagnostic Steps
1
Read the actual temperature value reported by sensor D. If it reads an extreme temperature (above 60-70C) while other sensors read normally, it is likely a sensor or circuit fault rather than a genuine over-temperature condition.
2
Disconnect the sensor and measure its resistance — if shorted (near 0 ohms), the sensor has failed. If resistance is normal for ambient temperature (10K-47K ohms at 25C), the fault is in the wiring.
3
With the sensor disconnected, measure insulation resistance from each sensor wire to ground — should be greater than 100K ohms. A low reading identifies a short to ground in the harness.
4
Inspect the sensor connector for moisture, corrosion, or conductive contamination that could bridge the pins. Clean and dry the connector, apply dielectric grease, and reseal.
5
If a genuine over-temperature condition is suspected, inspect the battery cooling system for that zone — check coolant level, pump operation, and flow through the cooling plate channels.
Estimated Repair Cost
$150 - $1,500
Parts + labor, varies by vehicle and location
The battery management system has detected that hybrid battery temperature sensor D is reporting a voltage below the normal operating range, which corresponds to an abnormally high temperature reading from the NTC thermistor (NTC resistance decreases as temperature increases, pulling voltage lower)....
The most common cause of P0AEA (Hybrid Battery Temperature Sensor "D" Circuit Low) is: Shorted NTC thermistor (internal failure causing very low resistance)
Typical repair costs for P0AEA range from $150 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
If this fault represents a genuine over-temperature condition, there is a risk of thermal runaway in lithium-ion cells, which can result in fire. Even if it is a sensor fault, the BMS cannot verify thermal safety in that zone. The vehicle should be parked in a safe location away from structures and inspected promptly. Do not charge the vehicle until the cause is confirmed.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0AEA to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid/EV High-Voltage Battery
Difficulty
Type
Generic (SAE)
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