AutoCodes – Buick – P1AE7 Buick

P1AE7 Buick Code - Battery Energy Control Module Hybrid Battery Voltage System Isolation Lost

Quick Answer

The Battery Energy Control Module will diagnose its own systems and determine when a fault condition is present. Common causes include Faulty Hybrid/EV Battery Pack, Hybrid/EV Battery Pack harness is open or shorted, Hybrid/EV Battery Pack 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: P1AE7 Buick indicates Battery Energy Control Module Hybrid Battery Voltage System Isolation Lost.
Common causes: Common causes include Faulty Hybrid/EV Battery Pack, Hybrid/EV Battery Pack harness is open or shorted, Hybrid/EV Battery Pack 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 958

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 Mar 01, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1AE7 Buick Description

The Battery Energy Control Module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the battery energy control module to the vehicle control interface module through serial data. The vehicle control interface module is the host controller for Diagnostic Trouble Code (DTC) information.
The vehicle is equipped with a high voltage isolation monitor feature. The purpose of the high voltage isolation circuit is to test the resistance between the high voltage positive and negative direct current (DC) bus and chassis ground. The battery energy control module only runs this test when the ignition transitions from ON to OFF and the high voltage contactor relays have opened. The battery energy control module has an internal isolation sensor that measures the resistance between the high voltage DC positive and negative bus and chassis ground. The battery energy control module runs an internal self check of this sensor circuit. The battery energy control module sends an AC signal over the DC bus and monitors its amplitude. A low amplitude or collapsed return signal indicates a loss of resistance to chassis ground and a loss of isolation will be indicated by the hybrid powertrain control module 2. Because this diagnostic runs after system power down, the diagnostic status does not get reported until the next key cycle.

OBDII Code P1AE7 Buick - Battery Energy Control Module Hybrid Battery Voltage System Isolation Lost - AutoCodes.com — P1AE7 Buick Code - Battery Energy Control Module Hybrid Battery Voltage System Isolation Lost

What does this mean?

What are the Possible Causes of the DTC P1AE7 Buick?

Faulty Hybrid/EV Battery Pack
Hybrid/EV Battery Pack harness is open or shorted
Hybrid/EV Battery Pack circuit poor electrical connection

How to Fix the DTC P1AE7 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 P1AE7 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 P1AE7 Buick Code

1. What are the common symptoms of OBDII code P1AE7 in a Buick related to the Battery Energy Control Module Hybrid Battery Voltage System Isolation Lost?

- Common symptoms include loss of power, reduced fuel efficiency, and potential issues with starting the vehicle.

2. What can cause the OBDII code P1AE7 to trigger in a Buick?

- The code P1AE7 is typically triggered by a malfunction in the Battery Energy Control Module, which leads to a loss of isolation in the hybrid battery voltage system.

3. How serious is the OBDII code P1AE7 related to the Battery Energy Control Module in a Buick?

- The code P1AE7 is a serious issue that can affect the performance and efficiency of the hybrid system in the vehicle. It is recommended to address this issue promptly.

4. Can driving with the OBDII code P1AE7 present in a Buick cause further damage?

- Driving with the code P1AE7 present can potentially cause further damage to the hybrid battery system and other related components. It is advisable to have the issue diagnosed and repaired as soon as possible.

5. How can I diagnose the OBDII code P1AE7 in my Buick at home?

- While it is recommended to have a professional diagnose the code, you can start by checking the hybrid battery connections and ensuring they are secure. However, a comprehensive diagnosis may require specialized tools and expertise.

6. Is it safe to continue driving my Buick with the OBDII code P1AE7 stored in the system?

- It is not recommended to continue driving the vehicle with the code P1AE7 present, as it can lead to potential safety hazards and further damage to the hybrid system.

7. What are the repair options for addressing the OBDII code P1AE7 in a Buick?

- Repair options may include replacing the Battery Energy Control Module, checking and repairing any damaged wiring, or addressing any other underlying issues with the hybrid battery system.

8. How much does it typically cost to repair the OBDII code P1AE7 in a Buick?

- The cost of repairing the code P1AE7 can vary depending on the specific issue causing the fault. It is recommended to consult a professional for an accurate diagnosis and cost estimate.

9. Can a DIY enthusiast with automotive experience fix the OBDII code P1AE7 in a Buick?

- While some DIY enthusiasts may be able to address simpler issues related to the code P1AE7, it is generally recommended to seek professional help due to the complexity of hybrid systems and the specialized tools required.

10. How can regular maintenance help prevent the occurrence of the OBDII code P1AE7 in a Buick?

- Regular maintenance, including checking the hybrid battery system, ensuring proper connections, and following the manufacturer's recommended maintenance schedule, can help prevent issues that may trigger the code P1AE7.