AutoCodes – GMC – P0AEC 2018 GMC Sierra

P0AEC 2018 GMC Sierra Code - Hybrid/EV Battery Temperature Sensor 4 Circuit Erratic

Quick Answer

Hybrid/EV Battery Temperature Sensors are used to monitor the battery temperature. Common causes include Faulty Hybrid/EV Battery Assembly, Hybrid/EV Battery Assembly harness is open or shorted, Hybrid/EV Battery Assembly 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: P0AEC 2018 GMC Sierra indicates Hybrid/EV Battery Temperature Sensor 4 Circuit Erratic.
Common causes: Common causes include Faulty Hybrid/EV Battery Assembly, Hybrid/EV Battery Assembly harness is open or shorted, Hybrid/EV Battery Assembly 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 184

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 22, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0AEC 2018 GMC Sierra Description

Hybrid/EV Battery Temperature Sensors are used to monitor the battery temperature. The non-serviceable battery temperature sensors are located within the battery sections. Two temperature sensors are located in each battery section. The temperature sensor is a variable resistor that measures the temperature of the battery cell group. The hybrid/EV interface control module supplies 5 V to the signal circuit and is a ground for the low reference circuit. The battery temperature sensor resistance changes with battery temperature. As the temperature decreases, the sensor resistance increases. As the temperature increases, the sensor resistance decreases.
Each Hybrid/EV Battery Interface Control Module communicates the temperature sensor values to the Hybrid/EV Powertrain Control Module via serial data.
The Hybrid/EV Powertrain Control Module uses the battery temperature sensors to determine the Hybrid/EV Battery Module temperature in order to control the battery cooling system operation.
The Diagnostic Trouble Code (DTC) will be set when the hybrid battery temperature sensor is intermittent or has changed by 10°C (18°F) or greater for 4 out of 5 seconds.

OBDII Code P0AEC 2018 GMC Sierra - Hybrid/EV Battery Temperature Sensor 4 Circuit Erratic - AutoCodes.com — P0AEC 2018 GMC Sierra Code - Hybrid/EV Battery Temperature Sensor 4 Circuit Erratic

What does this mean?

What are the Possible Causes of the DTC P0AEC 2018 GMC Sierra?

Faulty Hybrid/EV Battery Assembly
Hybrid/EV Battery Assembly harness is open or shorted
Hybrid/EV Battery Assembly circuit poor electrical connection
Faulty Hybrid/EV Battery Interface Control Module

How to Fix the DTC P0AEC 2018 GMC Sierra?

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 P0AEC 2018 GMC Sierra 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.

Need more information about the P0AEC 2018 GMC Sierra code?

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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 P0AEC 2018 GMC Sierra Code

What does the OBDII code P0AEC mean for a 2018 GMC Sierra?

Code P0AEC indicates an erratic circuit issue with Hybrid/EV Battery Temperature Sensor 4, meaning the sensor is sending inconsistent or faulty data to the vehicle's control module.

What are common symptoms of the P0AEC code?

Symptoms may include warning lights on the dashboard, reduced fuel efficiency, limited hybrid or EV performance, or charging system malfunctions.

What causes the P0AEC code to appear?

The code can be triggered by a faulty temperature sensor, damaged wiring or connectors, corrosion in the circuit, or issues within the battery control module.

Can I drive my 2018 GMC Sierra with the P0AEC code?

While the vehicle may still be drivable, continued use could lead to reduced performance or potential damage to the hybrid/EV battery system. It’s best to address the issue promptly.

How do you diagnose the P0AEC code?

Diagnosis involves scanning for additional codes, inspecting the wiring and connectors to Sensor 4, testing the sensor itself, and checking the battery control module for faults.

What repairs can fix the P0AEC code?

Repairs may include replacing the faulty temperature sensor, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the battery control module.

How much does it cost to repair the P0AEC code?

Repair costs vary but typically range from $100 to $500 depending on whether the sensor, wiring, or control module needs replacement or repairs.

Can the P0AEC code be caused by environmental factors?

Yes, extreme temperatures, water intrusion, or corrosion can affect the sensor or its circuit, leading to this code.

Do I need special tools to fix the P0AEC code?

Basic tools for wiring inspection and replacement may suffice, but advanced diagnostic tools or software may be needed to test the sensor and reprogram the battery control module.

Is the P0AEC code common in the 2018 GMC Sierra?

This code is relatively uncommon but can occur in hybrid or EV configurations of the vehicle due to wear, environmental conditions, or electrical issues.