AutoCodes – Generic – P0A84

P0A84 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 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.

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Code Popularity 19,401

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 11, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0A84 Description

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. Furthermore, the cooling air travels through an intake duct (which connects the battery blower assembly to the upper right surface of the HV battery assembly) and flows to the HV battery assembly.
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

OBDII Code P0A84 - Hybrid Battery Pack Cooling Fan 1 Control Circuit Low - AutoCodes.com — P0A84 Code - Hybrid Battery Pack Cooling Fan 1 Control Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0A84?

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?

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 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.

Need more information about the P0A84 code?

Need more information on how to fix the P0A84 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0A84 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P0A84 Buick — Hybrid/EV Battery Pack Cooling Fan Control Circuit Low Voltage
P0A84 Cadillac — Hybrid/EV Battery Pack Cooling Fan Control Circuit Low Voltage
P0A84 Chevrolet — Hybrid/EV Battery Pack Cooling Fan Control Circuit Low Voltage
P0A84 GMC — Hybrid/EV Battery Pack Cooling Fan Control Circuit Low Voltage
P0A84 Lexus — Hybrid Battery Pack Cooling Fan 1 Control Circuit Low
P0A84 Toyota — Hybrid Battery Pack Cooling Fan 1 Control Circuit Low

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0A84 Code

1. What are the common symptoms of OBDII code P0A84 (Hybrid Battery Pack Cooling Fan 1 Control Circuit Low)?

The common symptoms include the hybrid battery pack overheating, reduced fuel efficiency, and a warning light illuminated on the dashboard.

2. What are the possible causes of OBDII code P0A84?

Possible causes of this code include a faulty hybrid battery cooling fan, damaged wiring or connectors in the cooling fan circuit, or a problem with the hybrid battery management system.

3. How can I diagnose the issue related to OBDII code P0A84?

Diagnosing the issue involves checking the hybrid battery cooling fan operation, inspecting the wiring and connectors for any damage, and using a scan tool to monitor the hybrid battery system data.

4. Can I drive my vehicle with OBDII code P0A84 present?

It is not recommended to drive your vehicle with this code present, as it can lead to further damage to the hybrid battery pack. It is best to address the issue promptly.

5. How can I repair OBDII code P0A84?

Repairing this code may involve replacing the faulty hybrid battery cooling fan, repairing any damaged wiring or connectors, or resetting the hybrid battery management system.

6. Are there any DIY tips for addressing OBDII code P0A84?

While some basic checks like inspecting wiring connections can be done by DIY enthusiasts, it is recommended to seek professional help for diagnosing and repairing issues related to the hybrid battery system.

7. Is OBDII code P0A84 a common issue in hybrid vehicles?

Yes, OBDII code P0A84 related to the hybrid battery pack cooling fan control circuit is a common issue in hybrid vehicles, especially as they age and components wear out.

8. Can a malfunctioning hybrid battery cooling fan cause other problems in the vehicle?

Yes, a malfunctioning hybrid battery cooling fan can lead to overheating of the hybrid battery pack, reduced performance, and potential damage to other components in the hybrid system.

9. How much does it typically cost to repair OBDII code P0A84?

The cost of repairing this code can vary depending on the extent of the issue, parts needed for replacement, and labor costs. It is advisable to get a professional diagnosis for an accurate estimate.

10. How long does it take to repair OBDII code P0A84?

The repair time for this code can vary based on the specific issue and the expertise of the technician. In general, it may take a few hours to a day to address the problem and clear the code.