P0A84 Toyota Code - Hybrid Battery Pack Cooling Fan 1 Control Circuit Low
Quick Answer
The cooling air flows into the inlet on the right of the rear seat and travels through an intake duct to the battery blower assembly on the right surface of the luggage compartment. Common causes include Faulty Battery Cooling Blower Assembly, Battery Cooling Blower Assembly harness is open or shorted, Battery Cooling Blower Assembly circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0A84 Toyota indicates Hybrid Battery Pack Cooling Fan 1 Control Circuit Low.
- Common causes
- Common causes include Faulty Battery Cooling Blower Assembly, Battery Cooling Blower Assembly harness is open or shorted, Battery Cooling Blower Assembly circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0A84 Toyota Description
The cooling air flows from the top to the bottom between the HV battery modules. After it has cooled the modules, it is discharged from the bottom right surface of the HV battery assembly.
The exhaust air travels through an exhaust duct on the right surface of luggage compartment and is discharged into the cabin as well as outside of the vehicle.
The battery ECU uses battery temperature sensors in order to detect the temperature of the HV battery assembly. Based on the results of this detection, the battery ECU controls the battery blower assembly. (Thus, the battery blower assembly starts when the HV battery temperature rises to a predetermined level.)
The speed of the battery cooling blower assembly is controlled by the power management control ECU. Battery cooling blower assembly power is supplied when the FCTL terminal of the power management control ECU turns on the battery blower relay. The power management control ECU sends command signals (SI) to the battery cooling blower assembly to get the fan speed corresponding to the HV battery temperature. Information about the voltage applied to the battery cooling blower assembly (VM) is sent to the power management control ECU as a monitor signal using serial communication via the
What are the Possible Causes of the DTC P0A84 Toyota?
- Faulty Battery Cooling Blower Assembly
- Battery Cooling Blower Assembly harness is open or shorted
- Battery Cooling Blower Assembly circuit poor electrical connection
- Faculty Integration relay
- Faculty Battery smart unit
- Faculty Power management control ECU
How to Fix the DTC P0A84 Toyota?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0A84 Toyota code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0A84 Toyota Code
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