AutoCodes – GMC – P0AE4 GMC

P0AE4 GMC Code - Hybrid/EV Battery Precharge Transistor Control Circuit

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: P0AE4 GMC indicates Hybrid/EV Battery Precharge Transistor Control Circuit.
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 1,003

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 P0AE4 GMC 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 P0AE4 GMC - Hybrid/EV Battery Precharge Transistor Control Circuit - AutoCodes.com — P0AE4 GMC Code - Hybrid/EV Battery Precharge Transistor Control Circuit

What does this mean?

What are the Possible Causes of the DTC P0AE4 GMC?

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 P0AE4 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 P0AE4 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.

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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 P0AE4 GMC Code

1. What are the common symptoms of OBDII code P0AE4 in a GMC vehicle?

- Common symptoms include difficulty starting the engine, reduced hybrid system performance, and illuminated warning lights on the dashboard.

2. What could cause the Hybrid/EV Battery Precharge Transistor Control Circuit issue in a GMC vehicle?

- Possible causes of this code include a faulty precharge transistor, wiring issues, a malfunctioning hybrid battery, or problems with the hybrid system control module.

3. How can I diagnose the Hybrid/EV Battery Precharge Transistor Control Circuit problem in my GMC vehicle?

- Diagnosis typically involves using an OBDII scanner to read the code, conducting a visual inspection of the hybrid system components, and performing electrical tests to check for continuity and proper voltage.

4. Can I drive my GMC vehicle with the P0AE4 code present?

- It is not recommended to continue driving a vehicle with this code present, as it can lead to further damage to the hybrid system components and potentially cause unsafe driving conditions.

5. What are some DIY repair tips for addressing the OBDII code P0AE4 in a GMC vehicle?

- DIY repair tips may include checking and cleaning the hybrid system connectors, inspecting the wiring harness for damage, and resetting the system by disconnecting the hybrid battery for a few minutes.

6. Is it necessary to take my GMC vehicle to a dealership or mechanic for repairs related to the Hybrid/EV Battery Precharge Transistor Control Circuit issue?

- While some DIY repairs may be possible, it is recommended to seek professional assistance from a dealership or qualified mechanic familiar with hybrid vehicle systems to accurately diagnose and repair the issue.

7. How much does it cost to repair the Hybrid/EV Battery Precharge Transistor Control Circuit problem in a GMC vehicle?

- The cost of repairs can vary depending on the specific cause of the issue, but it may involve replacing the precharge transistor, repairing wiring, or addressing other components of the hybrid system. Costs can range from a few hundred to over a thousand dollars.

8. Will resetting the OBDII code P0AE4 in my GMC vehicle make the problem go away?

- Resetting the code may temporarily turn off the warning light, but it will not fix the underlying issue causing the Hybrid/EV Battery Precharge Transistor Control Circuit problem. It is important to address the root cause of the code to prevent further damage.

9. Can the OBDII code P0AE4 in a GMC vehicle cause other related issues if left untreated?

- Yes, leaving the issue unresolved can lead to further damage to the hybrid system components, reduced fuel efficiency, and potentially result in the vehicle going into a fail-safe mode to protect itself from further damage.

10. How long does it typically take to repair the Hybrid/EV Battery Precharge Transistor Control Circuit problem in a GMC vehicle?

- The repair time can vary depending on the complexity of the issue and the availability of parts. In some cases, repairs can be completed in a few hours, while more extensive issues may require a day or more to resolve.