AutoCodes – Buick – P0AE7 Buick

P0AE7 Buick Code - Hybrid/EV Battery Precharge Contactor Control Circuit High Voltage

Quick Answer

The hybrid battery system voltage is controlled by two high voltage contactors. Common causes include Faulty Starter/Generator Control Module, Starter/Generator Control Module harness is open or shorted, Starter/Generator Control Module 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: P0AE7 Buick indicates Hybrid/EV Battery Precharge Contactor Control Circuit High Voltage.
Common causes: Common causes include Faulty Starter/Generator Control Module, Starter/Generator Control Module harness is open or shorted, Starter/Generator Control Module 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 698

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 P0AE7 Buick Description

The hybrid battery system voltage is controlled by two high voltage contactors. The high voltage contactors allow the high voltage DC batteries to be connected to the vehicle or safely contain the high voltage DC within the Hybrid/EV Battery Pack assembly. Of the two contactors, one is a pre-charge contactor and the other is the primary contactor. The two contactors are closed in a specific sequence by the Starter/Generator Control Module. The pre-charge contactor is closed first. This causes high voltage to flow through the pre-charge resistor, allowing system voltage to build slowly. Once the system voltage has raised and stabilized, the primary contactor is closed. Both contactors are controlled by the Starter/Generator Control Module. The Starter/Generator Control Module supplies B+ to each contactor at all times. When the contactors are to be closed, the Starter/Generator Control Module will provide a ground to the contactor through a low side driver.

OBDII Code P0AE7 Buick - Hybrid/EV Battery Precharge Contactor Control Circuit High Voltage - AutoCodes.com — P0AE7 Buick Code - Hybrid/EV Battery Precharge Contactor Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0AE7 Buick?

Faulty Starter/Generator Control Module
Starter/Generator Control Module harness is open or shorted
Starter/Generator Control Module circuit poor electrical connection

How to Fix the DTC P0AE7 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 P0AE7 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.

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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 P0AE7 Buick Code

1. What are common symptoms of OBDII code P0AE7 in a Buick Hybrid/EV vehicle?

- Common symptoms include the check engine light illuminating, reduced hybrid system performance, and potential difficulty starting the vehicle.

2. What does the OBDII code P0AE7 in a Buick Hybrid/EV vehicle indicate?

- This code specifically points to an issue with the Hybrid/EV Battery Precharge Contactor Control Circuit registering high voltage.

3. What are possible causes of the Hybrid/EV Battery Precharge Contactor Control Circuit high voltage issue in a Buick Hybrid/EV vehicle?

- Potential causes include a faulty precharge contactor, damaged wiring or connectors, issues with the battery management system, or a malfunctioning hybrid battery.

4. How can I diagnose the cause of OBDII code P0AE7 in my Buick Hybrid/EV vehicle?

- Diagnosing this code typically involves using a diagnostic scan tool to retrieve specific fault codes, checking the condition of the precharge contactor, inspecting wiring connections, and testing the hybrid battery system.

5. Can I continue driving my Buick Hybrid/EV vehicle with the P0AE7 code present?

- It is not recommended to continue driving the vehicle with this code active, as it can lead to further damage to the hybrid system and potentially compromise vehicle safety.

6. How can I repair OBDII code P0AE7 in my Buick Hybrid/EV vehicle?

- Repairing this code may involve replacing the faulty precharge contactor, repairing damaged wiring or connectors, resetting the battery management system, or addressing any issues with the hybrid battery.

7. Are there any DIY tips for addressing the Hybrid/EV Battery Precharge Contactor Control Circuit high voltage issue?

- DIY tips may include checking and securing wiring connections, ensuring the precharge contactor is functioning properly, and performing a visual inspection of the hybrid battery components.

8. Is it necessary to clear the OBDII code P0AE7 after repairing the issue in a Buick Hybrid/EV vehicle?

- Yes, it is important to clear the fault code after repairing the issue to reset the vehicle's system and ensure the problem has been resolved.

9. How can I prevent the recurrence of OBDII code P0AE7 in my Buick Hybrid/EV vehicle?

- Regular maintenance of the hybrid system, including checking the precharge contactor and monitoring the battery system, can help prevent the reoccurrence of this code.

10. Should I seek professional help for diagnosing and repairing OBDII code P0AE7 in my Buick Hybrid/EV vehicle?

- Due to the complexity of hybrid and EV systems, it is recommended to seek professional help from a certified technician experienced in working with hybrid vehicles to accurately diagnose and repair this code.