AutoCodes – Buick – P0A85 Buick

P0A85 Buick Code - Hybrid/EV Battery Pack Cooling Fan Control Circuit High Voltage

Quick Answer

The hybrid/EV battery pack cooling fan draws air through the hybrid/EV battery pack to control the temperature of the hybrid/EV battery pack. Common causes include Faulty Hybrid/EV Battery Pack Cooling Fan, Hybrid/EV Battery Pack Cooling Fan harness is open or shorted, Hybrid/EV Battery Pack Cooling Fan 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: P0A85 Buick indicates Hybrid/EV Battery Pack Cooling Fan Control Circuit High Voltage.
Common causes: Common causes include Faulty Hybrid/EV Battery Pack Cooling Fan, Hybrid/EV Battery Pack Cooling Fan harness is open or shorted, Hybrid/EV Battery Pack Cooling Fan 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 639

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 Nov 20, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0A85 Buick Description

The hybrid/EV battery pack cooling fan draws air through the hybrid/EV battery pack to control the temperature of the hybrid/EV battery pack. To operate, the cooling fan receives an enable signal from the starter/generator control module. The enable control is controlled by a discrete high side driver in the starter/generator control module. When the enable control circuit is high, the fan will be enabled. The fan speed is controlled by a fan control circuit from the starter/generator control module, by changing the duty cycle. The maximum fan speed is 3900 RPM. Hybrid/EV battery pack cooling fan enable circuit open and short to voltage diagnostics run continuously until hybrid/EV battery pack cooling fan is enabled to run while short to ground runs after it is enabled to run. These diagnostics detect and report a failure of the fan to enable circuits.

OBDII Code P0A85 Buick - Hybrid/EV Battery Pack Cooling Fan Control Circuit High Voltage - AutoCodes.com — P0A85 Buick Code - Hybrid/EV Battery Pack Cooling Fan Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0A85 Buick?

Faulty Hybrid/EV Battery Pack Cooling Fan
Hybrid/EV Battery Pack Cooling Fan harness is open or shorted
Hybrid/EV Battery Pack Cooling Fan circuit poor electrical connection
Faulty Starter/Generator Control Module

How to Fix the DTC P0A85 Buick?

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 P0A85 Buick 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 P0A85 Buick code?

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Need Help with the Code?

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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 P0A85 Buick Code

1. What are the common symptoms of OBDII code P0A85 in a Buick Hybrid/EV?

- Common symptoms include the hybrid/EV battery pack cooling fan running at a higher speed than normal, decreased fuel efficiency, and potential overheating of the battery pack.

2. What are the possible causes of the Hybrid/EV Battery Pack Cooling Fan Control Circuit High Voltage error code?

- The error code P0A85 in a Buick Hybrid/EV can be caused by a faulty cooling fan control module, a malfunctioning cooling fan, damaged wiring or connectors, or issues with the hybrid/EV battery pack.

3. How can I diagnose the cause of the Hybrid/EV Battery Pack Cooling Fan Control Circuit High Voltage code in my Buick?

- Diagnosis typically involves checking the cooling fan operation, inspecting the wiring and connectors for any damage, testing the fan control module, and performing a thorough scan of the hybrid/EV system for any related faults.

4. Can I still drive my Buick with the OBDII code P0A85 present?

- It is not recommended to drive your Buick with the P0A85 code present as it can lead to potential overheating of the hybrid/EV battery pack, which can result in more severe damage to the vehicle.

5. How can I repair the Hybrid/EV Battery Pack Cooling Fan Control Circuit High Voltage issue in my Buick?

- Repair options may include replacing the cooling fan control module, repairing or replacing the cooling fan, fixing any damaged wiring or connectors, and ensuring proper functioning of the hybrid/EV battery pack.

6. Is it possible to reset the OBDII code P0A85 in my Buick Hybrid/EV myself?

- While you can clear the error code using an OBDII scanner, it is crucial to address the underlying issue causing the P0A85 code to prevent further damage to the vehicle.

7. Are there any preventative maintenance tips to avoid the Hybrid/EV Battery Pack Cooling Fan Control Circuit High Voltage error in my Buick?

- Regularly inspecting the cooling fan system, wiring, and connectors for any signs of wear or damage, as well as following the manufacturer's recommended maintenance schedule for the hybrid/EV system, can help prevent the occurrence of the P0A85 code.

8. Can extreme weather conditions impact the occurrence of the P0A85 code in a Buick Hybrid/EV?

- Yes, extreme temperatures can put additional strain on the cooling system of the hybrid/EV battery pack, potentially leading to the triggering of the P0A85 error code. Ensuring proper cooling system function is essential in such conditions.

9. How long does it typically take to repair the Hybrid/EV Battery Pack Cooling Fan Control Circuit High Voltage issue in a Buick?

- The repair time can vary depending on the exact cause of the issue and the extent of the repairs needed. It is recommended to consult a professional mechanic for a more accurate estimate based on the specific situation.

10. Are there any recalls or service bulletins related to the OBDII code P0A85 in Buick Hybrid/EV models?

- It is advisable to check with the manufacturer or authorized service centers for any relevant recalls or service bulletins related to the P0A85 code in Buick Hybrid/EV vehicles, as they may provide valuable information or potential solutions.