AutoCodes – GMC – P0AE3 GMC

P0AE3 GMC Code - Hybrid/EV Battery Precharge Contactor Circuit Stuck Open

Quick Answer

The hybrid/EV battery contains 4 high voltage contactors and 1 solid state relay (transistor). 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: P0AE3 GMC indicates Hybrid/EV Battery Precharge Contactor Circuit Stuck Open.
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 840

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 27, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0AE3 GMC Description

The hybrid/EV battery contains 4 high voltage contactors and 1 solid state relay (transistor). The high voltage contactors and transistor allow the high voltage DC batteries to be connected to the vehicle or contain the high voltage DC within the hybrid/EV battery assembly. The 4 high voltage contactors consist of a main positive high voltage contactor, main negative high voltage contactor, charge positive high voltage contactor and a precharge negative high voltage contactor. The transistor controls the battery heater high voltage positive circuit. The contactors and transistor 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 each high voltage contactor/transistor. Ground is provided through a vehicle ground external of the high voltage battery.

OBDII Code P0AE3 GMC - Hybrid/EV Battery Precharge Contactor Circuit Stuck Open - AutoCodes.com — P0AE3 GMC Code - Hybrid/EV Battery Precharge Contactor Circuit Stuck Open

What does this mean?

What are the Possible Causes of the DTC P0AE3 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 P0AE3 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 P0AE3 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 P0AE3 GMC Code

1. What are the common symptoms of OBDII code P0AE3 in a GMC hybrid/EV vehicle?

The common symptoms include the vehicle not starting, reduced power or no power at all, and a check engine light with the code P0AE3 displayed.

2. What does the OBDII code P0AE3 in a GMC hybrid/EV vehicle indicate?

This code indicates that the hybrid/EV battery precharge contactor circuit is stuck open, causing a disruption in the precharge process necessary for the high-voltage system to engage.

3. What are the possible causes of the Hybrid/EV Battery Precharge Contactor Circuit being stuck open in a GMC vehicle?

Possible causes include a faulty precharge contactor, damaged wiring or connectors in the precharge circuit, or issues with the battery management system.

4. How can I diagnose the issue related to OBDII code P0AE3 in my GMC hybrid/EV vehicle?

Diagnosing the issue involves checking the precharge contactor for proper operation, inspecting the wiring and connectors for damage, and using a multimeter to test for continuity in the circuit.

5. Can I still drive my GMC vehicle with the OBDII code P0AE3 present?

It is not recommended to drive the vehicle with this code present, as it can lead to further damage to the hybrid/EV system and potentially unsafe driving conditions.

6. How can the issue related to OBDII code P0AE3 in a GMC hybrid/EV vehicle be repaired?

Repairing the issue may involve replacing the faulty precharge contactor, repairing or replacing damaged wiring and connectors, or resetting the battery management system as per manufacturer's guidelines.

7. Is it possible to reset the OBDII code P0AE3 in a GMC vehicle without repairing the underlying issue?

Resetting the code without addressing the underlying issue may temporarily clear the check engine light, but the problem will likely reoccur until the root cause is resolved.

8. Are there any preventive maintenance tips to avoid encountering the OBDII code P0AE3 in a GMC hybrid/EV vehicle?

Regularly inspecting the high-voltage system components, following the manufacturer's recommended maintenance schedule, and addressing any warning signs promptly can help prevent issues leading to this code.

9. Can a DIY enthusiast with basic automotive knowledge repair the OBDII code P0AE3 issue in a GMC hybrid/EV vehicle?

While some basic troubleshooting steps can be performed by a DIY enthusiast, diagnosing and repairing the complex hybrid/EV system issues related to this code may require specialized tools and expertise best left to professionals.

10. How much can I expect to pay for the repair of the OBDII code P0AE3 in a GMC hybrid/EV vehicle?

The cost of repair can vary depending on the extent of the issue, the parts needed for replacement, and the labor rates of the repair shop, but it can range from a few hundred to over a thousand dollars.