AutoCodes – Buick – P0AE2 Buick

P0AE2 Buick Code - Hybrid/EV Battery Precharge Transistor Circuit Stuck On

Quick Answer

The hybrid/EV battery contains 5 high voltage contactors and 2 transistors. Common causes include Faulty Battery Energy Control Module, Battery Energy Control Module harness is open or shorted, Battery Energy 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: P0AE2 Buick indicates Hybrid/EV Battery Precharge Transistor Circuit Stuck On.
Common causes: Common causes include Faulty Battery Energy Control Module, Battery Energy Control Module harness is open or shorted, Battery Energy 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 1,077

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 Apr 25, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0AE2 Buick Description

The hybrid/EV battery contains 5 high voltage contactors and 2 transistors. The high voltage contactors and transistors allow the high voltage DC batteries to be connected to the vehicle or safely contain the high voltage DC within the hybrid/EV battery assembly. The 5 high voltage contactors consist of a main positive high voltage contactor, main negative high voltage contactor, charge positive high voltage contactor, charge negative high voltage contactor and multi-function high voltage contactor. The 2 transistors consist of the precharge transistor and heater transistor. The contactors and transistors close and open in a specific sequence controlled by the hybrid/EV powertrain control module 2. The hybrid/EV powertrain control module 2 supplies voltage to the control circuit for the high voltage contactors/transistors. Ground is provided through the case ground.

OBDII Code P0AE2 Buick - Hybrid/EV Battery Precharge Transistor Circuit Stuck On - AutoCodes.com — P0AE2 Buick Code - Hybrid/EV Battery Precharge Transistor Circuit Stuck On

What does this mean?

What are the Possible Causes of the DTC P0AE2 Buick?

Faulty Battery Energy Control Module
Battery Energy Control Module harness is open or shorted
Battery Energy Control Module circuit poor electrical connection

How to Fix the DTC P0AE2 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 P0AE2 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 P0AE2 Buick Code

1. What are the common symptoms of OBDII code P0AE2 in a Buick Hybrid/EV vehicle?

- Common symptoms include the vehicle not starting, reduced power, illuminated warning lights (such as the check engine light), and poor fuel efficiency.

2. What does the OBDII code P0AE2 in a Buick Hybrid/EV indicate?

- The code P0AE2 specifically refers to the Hybrid/EV Battery Precharge Transistor Circuit being stuck on, which can affect the vehicle's hybrid or electric propulsion system.

3. What are the possible causes of OBDII code P0AE2 in a Buick Hybrid/EV?

- The code P0AE2 can be triggered by issues with the precharge transistor circuit itself, wiring problems, software glitches, or faults in the hybrid/EV battery system.

4. How serious is OBDII code P0AE2 in a Buick Hybrid/EV?

- OBDII code P0AE2 can be a serious issue as it directly impacts the operation of the hybrid/EV propulsion system, potentially leading to drivability issues and reduced efficiency.

5. Can I drive my Buick with OBDII code P0AE2?

- It's not recommended to continue driving your Buick if the code P0AE2 is present, as it can affect the performance and safety of the vehicle. It's best to address the issue promptly.

6. How can I diagnose and repair OBDII code P0AE2 in my Buick Hybrid/EV?

- Diagnosing and repairing code P0AE2 typically requires advanced diagnostic equipment to identify the specific cause, which may involve testing the precharge transistor circuit, checking wiring, and inspecting the battery system.

7. Is it safe to reset the OBDII code P0AE2 in a Buick Hybrid/EV without fixing the underlying issue?

- Resetting the code without addressing the root cause can temporarily clear the warning light, but the issue will likely resurface, potentially leading to more severe problems with the hybrid/EV system.

8. Can a DIY enthusiast fix OBDII code P0AE2 in a Buick Hybrid/EV?

- While basic troubleshooting like checking for loose connections or fuses can be done by DIY enthusiasts, diagnosing and repairing complex issues related to code P0AE2 may require professional expertise due to the high-voltage nature of hybrid/EV systems.

9. How much does it cost to repair OBDII code P0AE2 in a Buick Hybrid/EV?

- The cost of repairing code P0AE2 can vary depending on the specific cause of the issue. It's recommended to consult a professional technician for an accurate diagnosis and cost estimate.

10. Can OBDII code P0AE2 reoccur in a Buick Hybrid/EV after repair?

- If the underlying cause of the code P0AE2 is not fully addressed during the repair, there is a possibility of it reoccurring. It's crucial to ensure that all related components are properly diagnosed and fixed to prevent future issues.