AutoCodes – GMC – P0A85 GMC

P0A85 GMC 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 GMC 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 562

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

What does this mean?

What are the Possible Causes of the DTC P0A85 GMC?

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 GMC?

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 GMC 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 GMC 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 GMC Code

1. What does the OBDII code P0A85 mean on a GMC vehicle?

The P0A85 code indicates a high voltage issue in the Hybrid/EV battery pack cooling fan control circuit, which may affect the cooling system's performance.

2. What are the symptoms of the P0A85 code?

Common symptoms include an illuminated check engine light, reduced hybrid system performance, higher battery temperatures, or unusual fan operation noises.

3. What causes the P0A85 code to appear?

Potential causes include a faulty cooling fan motor, damaged wiring or connectors in the fan control circuit, a malfunctioning fan control module, or an issue with the hybrid battery temperature sensor.

4. Can I drive my GMC with the P0A85 code present?

Itâ€™s not recommended to drive for extended periods with this code as an overheating hybrid battery can lead to reduced efficiency or potential damage.

5. How is the P0A85 code diagnosed?

A technician will typically inspect the fan control circuit, check for damaged wiring or connectors, test the cooling fan motor, and verify proper operation of the fan control module.

6. How do I fix the P0A85 code on my GMC?

Repairs may involve replacing the cooling fan motor, repairing or replacing damaged wiring, or replacing a faulty fan control module.

7. How much does it cost to fix the P0A85 code?

Repair costs can vary but may range from $200 to $800 depending on whether the issue is a wiring repair or a component replacement such as the fan motor or control module.

8. Can a dirty cooling fan cause the P0A85 code?

Yes, debris or obstruction in the cooling fan can restrict its operation and potentially trigger the P0A85 code.

9. Is the P0A85 code specific to GMC vehicles?

No, the P0A85 code is a generic OBDII code, but its interpretation and repair process may vary slightly depending on the vehicle manufacturer and model.

10. Can I reset the P0A85 code without fixing the issue?

Clearing the code without addressing the underlying problem may temporarily turn off the warning light, but the issue will likely return and could lead to further damage.