What Does P0AEB Mean?
The battery management system has detected that hybrid battery temperature sensor D is reporting a voltage above the normal operating range, which corresponds to an abnormally low or implausible temperature reading from the NTC thermistor (high voltage means high resistance, meaning the sensor reads extremely cold or open). This typically indicates an open circuit condition in the sensor or its wiring, rather than a genuine extreme cold condition.
Safety Warning
An open temperature sensor means the BMS has no thermal visibility for that zone of the battery pack. The system will typically derate or disable the hybrid system as a precaution. While safer than a shorted sensor (which could mask over-temperature), this still compromises thermal protection. Repair before resuming normal use of the hybrid system.
Common Causes
30%
Open NTC thermistor (internal failure causing infinite resistance)
30%
Broken wire or open circuit in the sensor harness
25%
Disconnected or backed-out pin at the sensor or monitoring board connector
15%
Faulty cell monitoring board with open input or failed pull-up circuit
Diagnostic Steps
1
Read the reported temperature for sensor D. If it shows an implausibly low value (e.g., -40C or below) while other sensors are normal, this confirms an open circuit rather than a genuine temperature condition.
2
Access the battery pack and inspect the sensor D connector — verify it is fully seated and the locking tab is engaged. Check for backed-out terminal pins using a pin tension gauge or test light.
3
Disconnect the sensor and measure its resistance — an open reading (OL) confirms sensor failure. Normal NTC reading at 25C is typically 10K-47K ohms depending on sensor specification.
4
If the sensor measures normal, check the harness for continuity from the sensor connector to the cell monitoring board connector. Flex and wiggle the harness while monitoring to catch intermittent breaks.
5
Inspect the cell monitoring board connector for corrosion or damage to the temperature sensor input pins. Apply contact cleaner and reseat the connector.
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 above the normal operating range, which corresponds to an abnormally low or implausible temperature reading from the NTC thermistor (high voltage means high resistance, meaning the sensor reads...
The most common cause of P0AEB (Hybrid Battery Temperature Sensor "D" Circuit High) is: Open NTC thermistor (internal failure causing infinite resistance)
Typical repair costs for P0AEB range from $150 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
An open temperature sensor means the BMS has no thermal visibility for that zone of the battery pack. The system will typically derate or disable the hybrid system as a precaution. While safer than a shorted sensor (which could mask over-temperature), this still compromises thermal protection. Repair before resuming normal use of the hybrid system.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0AEB to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid/EV High-Voltage Battery
Difficulty
Type
Generic (SAE)
Recommended Tools
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