Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer found a problem with the sensor that checks the air temperature around the car's battery pack. It's like when a thermometer isn't working right and you can't tell how hot or cold it is.
The P0AAC code indicates an issue with the circuit of the air temperature sensor for the hybrid or electric vehicle's battery pack. This sensor helps monitor the temperature to ensure the battery operates safely.
The P0AAC code is triggered when the Powertrain Control Module (PCM) or Battery Energy Control Module (BECM) detects a fault in the air temperature sensor circuit for the hybrid or EV battery pack. This sensor is crucial for monitoring and regulating the battery temperature to prevent overheating or underperformance.
• Check Engine Light is on
• Reduced battery performance
• Possible overheating of the battery pack
• Faulty air temperature sensor
• Damaged wiring or connectors
• Faulty PCM or BECM
PCM: Powertrain Control Module
BECM: Battery Energy Control Module
• Use an OBD-II scanner to confirm the code
• Visually inspect the sensor and wiring for damage
• Test the sensor with a multimeter for proper operation
• Replace the faulty air temperature sensor
• Repair or replace damaged wiring or connectors
• Reprogram or replace the PCM/BECM if necessary
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Toyota Prius
• Chevrolet Volt
• Nissan Leaf
• Regularly inspect sensor wiring
• Ensure battery cooling systems are functioning
• Perform routine maintenance checks
Sensor Issue
• Do not ignore the Check Engine Light
• Have the vehicle inspected by a professional
• Avoid extreme temperatures if possible
Check with your vehicle manufacturer as hybrid/EV components often have extended warranties.
This code has become more common as hybrid and electric vehicles have increased in popularity, highlighting the importance of battery temperature management.
Moderate – While the vehicle may still operate, ignoring this issue could lead to battery damage or reduced efficiency.
Driving with a malfunctioning battery temperature sensor can lead to safety risks, including battery overheating. Always address such issues promptly.
• Vehicle at operating temperature
• Battery pack under normal load conditions
The air temperature sensor is typically located near or within the battery pack housing.
Q: Can I drive my car with the P0AAC code?
A: It's possible to drive, but it's not recommended as it may lead to battery overheating or reduced performance.
Q: How do I reset the P0AAC code?
A: Fix the underlying issue first, then use an OBD-II scanner to clear the code.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
View on Amazon
Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.