AutoCodes – GMC – P0AE9 2018 GMC Sierra

P0AE9 2018 GMC Sierra Code - Hybrid/EV Battery Temperature Sensor 4 Performance

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: P0AE9 2018 GMC Sierra indicates Hybrid/EV Battery Temperature Sensor 4 Performance.
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 173

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 P0AE9 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 difference between a single battery temperature sensor and an average of the other battery temperature sensors is greater than 25°C (45°F).

OBDII Code P0AE9 2018 GMC Sierra - Hybrid/EV Battery Temperature Sensor 4 Performance - AutoCodes.com — P0AE9 2018 GMC Sierra Code - Hybrid/EV Battery Temperature Sensor 4 Performance

What does this mean?

What are the Possible Causes of the DTC P0AE9 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 P0AE9 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 P0AE9 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 P0AE9 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 P0AE9 2018 GMC Sierra Code

1. What does the OBDII code P0AE9 mean on a 2018 GMC Sierra?

Code P0AE9 indicates an issue with the performance of Hybrid/EV Battery Temperature Sensor 4, which monitors the temperature of the vehicleâ€™s hybrid or EV battery.

2. What are the common symptoms of code P0AE9?

Symptoms may include the check engine light or hybrid system warning light turning on, reduced fuel efficiency, or limited hybrid system performance.

3. What causes the P0AE9 code to appear?

The primary causes include a faulty battery temperature sensor, damaged or corroded wiring, poor electrical connections, or a malfunction in the hybrid battery control module.

4. Can code P0AE9 affect the performance of the hybrid system?

Yes, a malfunctioning battery temperature sensor can lead to improper battery management, which may reduce the hybrid system's performance and efficiency.

5. How do I diagnose the P0AE9 code on my 2018 GMC Sierra?

Use a compatible OBDII scanner to confirm the code, inspect the battery temperature sensor and its wiring for damage or corrosion, and test the sensorâ€™s electrical resistance and output.

6. Is it safe to drive with code P0AE9 active?

While the vehicle may still be drivable, continuing to drive with this code could lead to reduced hybrid system performance or potential damage to the battery system.

7. How do I fix the P0AE9 code?

Repairs may involve replacing the faulty battery temperature sensor, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the hybrid battery control module if necessary.

8. How much does it cost to fix the P0AE9 code on a 2018 GMC Sierra?

The cost varies depending on the repair, but replacing a battery temperature sensor typically costs between $200 and $400, including parts and labor.

9. Can a software update resolve the P0AE9 code?

In some cases, a reprogramming of the hybrid battery control module may resolve the issue if it is caused by a software-related malfunction.

10. How can I prevent the P0AE9 code from recurring?

Regular maintenance, inspecting the hybrid battery system's wiring and connectors for damage, and ensuring proper operation of the battery cooling system can help prevent this code.