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 is having trouble reading the temperature from one of the sensors in the battery pack. It's like when a thermometer doesn't work right and you can't tell if it's hot or cold.
The vehicle's control module has detected an issue with the circuit of the temperature sensor labeled 'C' in the hybrid or electric vehicle's battery system.
The P0ACA code is triggered when the Powertrain Control Module (PCM) or Battery Energy Control Module (BECM) detects a malfunction in the battery temperature sensor circuit 'C'. This sensor is responsible for monitoring the temperature of the battery pack to ensure it operates within safe limits. If the sensor or its circuit fails, it can lead to incorrect temperature readings, potentially affecting battery performance and safety.
• Check Engine Light is on
• Reduced battery performance
• Possible overheating of the battery
• Faulty battery temperature sensor
• Damaged or corroded wiring/connectors
• Faulty PCM/BECM
PCM: Powertrain Control Module
BECM: Battery Energy Control Module
• Use an OBD-II scanner to confirm the code
• Inspect the battery temperature sensor and its wiring
• Test the sensor for proper resistance and output
• Replace the faulty battery temperature sensor
• Repair or replace damaged wiring/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
• Regular maintenance checks
• Ensure battery cooling system is functioning
• Avoid extreme temperature exposure
Sensor Issue
• Have the vehicle inspected by a professional
• Avoid heavy loads or long trips until repaired
Check with the vehicle manufacturer for specific warranty coverage on hybrid/EV components.
This code has been more common in older hybrid models as battery systems age.
Moderate – It should be addressed soon to prevent potential battery damage.
Ignoring this issue could lead to battery damage or reduced vehicle performance.
• Vehicle at operating temperature
• Battery under load conditions
The battery temperature sensor is typically located within the battery pack of the hybrid or electric vehicle.
Q: Can I drive with a P0ACA code?
A: It's not recommended to drive for long periods with this code, as it could lead to battery damage.
Q: How do I reset the P0ACA code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue persists, further diagnosis is needed.
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