AutoCodes – GMC – P0BC9 GMC

P0BC9 GMC Code - Hybrid/EV Battery Pack Cooling Fan Feedback Circuit Low 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: P0BC9 GMC indicates Hybrid/EV Battery Pack Cooling Fan Feedback Circuit Low 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 585

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 P0BC9 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 P0BC9 GMC - Hybrid/EV Battery Pack Cooling Fan Feedback Circuit Low Voltage - AutoCodes.com — P0BC9 GMC Code - Hybrid/EV Battery Pack Cooling Fan Feedback Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0BC9 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 P0BC9 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 P0BC9 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 P0BC9 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 P0BC9 GMC Code

1. What are the common symptoms of OBDII code P0BC9 in a GMC vehicle?

- Common symptoms include poor cooling system performance, illuminated check engine light, and potential issues with the hybrid/EV battery pack.

2. What can cause the Hybrid/EV Battery Pack Cooling Fan Feedback Circuit Low Voltage code in a GMC?

- Possible causes include a faulty cooling fan, damaged wiring or connectors, low voltage in the circuit, or a malfunctioning cooling fan control module.

3. How can I diagnose the root cause of P0BC9 in my GMC hybrid vehicle?

- Use a diagnostic scanner to read the code and check the cooling fan operation, inspect wiring for damage, and test voltage levels in the cooling fan feedback circuit.

4. Is it safe to continue driving with the Hybrid/EV Battery Pack Cooling Fan Feedback Circuit Low Voltage code present in my GMC?

- It is not recommended to drive the vehicle with this code present, as it can lead to overheating of the battery pack and potentially cause further damage.

5. Can I reset the OBDII code P0BC9 in my GMC without repairing the issue?

- While you can clear the code temporarily, it will likely reappear until the underlying issue with the cooling fan feedback circuit is resolved.

6. How much does it typically cost to repair the Hybrid/EV Battery Pack Cooling Fan Feedback Circuit Low Voltage issue in a GMC?

- The cost of repair can vary depending on the exact cause, but it may involve replacing the cooling fan, repairing wiring, or addressing other related components. Costs can range from $100 to $500 or more.

7. Are there any DIY repair tips for fixing the P0BC9 code in a GMC?

- DIY enthusiasts can start by checking and cleaning electrical connections, inspecting for visible damage in the wiring, and testing the cooling fan for proper operation before seeking professional help if needed.

8. Will fixing the Hybrid/EV Battery Pack Cooling Fan Feedback Circuit Low Voltage code improve fuel efficiency in my GMC hybrid vehicle?

- Yes, resolving this issue can help restore the proper functioning of the cooling system, which in turn can optimize the performance and efficiency of the vehicle.

9. Can a mechanic easily repair the P0BC9 code in a GMC, or does it require specialized skills?

- A qualified mechanic with experience in hybrid vehicle systems should be able to diagnose and repair the issue effectively, as it may involve working with high-voltage components and specialized equipment.

10. How often does the Hybrid/EV Battery Pack Cooling Fan Feedback Circuit Low Voltage code occur in GMC vehicles?

- While not extremely common, this code can occur in GMC hybrid or electric vehicles due to issues with the cooling system components, electrical connections, or control modules.