AutoCodes – GMC – P0A9C 2014 GMC Sierra

P0A9C 2014 GMC Sierra Code - Hybrid/EV Battery Temperature Sensor 1 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: P0A9C 2014 GMC Sierra indicates Hybrid/EV Battery Temperature Sensor 1 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 291

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 P0A9C 2014 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 P0A9C 2014 GMC Sierra - Hybrid/EV Battery Temperature Sensor 1 Performance - AutoCodes.com — P0A9C 2014 GMC Sierra Code - Hybrid/EV Battery Temperature Sensor 1 Performance

What does this mean?

What are the Possible Causes of the DTC P0A9C 2014 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 P0A9C 2014 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 P0A9C 2014 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.

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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 P0A9C 2014 GMC Sierra Code

1. What does the OBDII code P0A9C mean on a 2014 GMC Sierra?

The code P0A9C indicates an issue with the Hybrid/EV Battery Temperature Sensor 1, specifically related to its performance or operation.

2. What are the common symptoms of code P0A9C in a 2014 GMC Sierra?

Common symptoms include an illuminated check engine light, reduced hybrid system performance, decreased fuel efficiency, or the vehicle entering a limp mode.

3. What causes the P0A9C code to appear in a 2014 GMC Sierra?

The code can be triggered by a faulty battery temperature sensor, damaged wiring or connectors, a malfunctioning hybrid battery control module, or issues with the battery cooling system.

4. How do I diagnose the P0A9C code on my GMC Sierra?

Start by scanning for additional codes, inspecting the battery temperature sensor wiring and connectors for damage, and testing the sensor's resistance and voltage output with a multimeter.

5. Can I drive my 2014 GMC Sierra with the P0A9C code?

Itâ€™s not recommended to drive the vehicle for extended periods, as this code may indicate potential overheating or improper monitoring of the hybrid battery, which could lead to further damage.

6. How do you fix the P0A9C code on a GMC Sierra?

Repairs may include replacing the faulty battery temperature sensor, repairing or replacing damaged wiring or connectors, or addressing issues with the hybrid battery cooling system.

7. How much does it cost to repair the P0A9C code on a 2014 GMC Sierra?

Costs can vary but may range from $100 to $300 for a new temperature sensor and labor. More extensive repairs involving the hybrid system could be higher.

8. Can a low hybrid battery charge cause the P0A9C code?

While not a direct cause, a low or malfunctioning hybrid battery could contribute to temperature monitoring issues and trigger this code.

9. Does the P0A9C code require reprogramming the hybrid control module?

Reprogramming is not always necessary, but if the module is replaced or updated, it may require reprogramming to ensure compatibility.

10. How can I prevent the P0A9C code from recurring?

Regularly inspect the hybrid battery system, ensure proper cooling system function, and promptly address any warning lights or unusual performance issues.