AutoCodes – GMC – P0AC8 GMC

P0AC8 GMC Code - Hybrid/EV Battery Temperature Sensor 2 Circuit High Voltage

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: P0AC8 GMC indicates Hybrid/EV Battery Temperature Sensor 2 Circuit High Voltage.
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 839

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 P0AC8 GMC 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 less than -69°C (-92°F).

OBDII Code P0AC8 GMC - Hybrid/EV Battery Temperature Sensor 2 Circuit High Voltage - AutoCodes.com — P0AC8 GMC Code - Hybrid/EV Battery Temperature Sensor 2 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0AC8 GMC?

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 P0AC8 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 P0AC8 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.

Need more information about the P0AC8 GMC code?

Need more information on how to fix the P0AC8 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific GMC Models

P0AC8 2014 GMC Sierra — Hybrid/EV Battery Temperature Sensor 2 Circuit High Voltage
P0AC8 2015 GMC Sierra — Hybrid/EV Battery Temperature Sensor 2 Circuit High Voltage
P0AC8 2016 GMC Sierra — Hybrid/EV Battery Temperature Sensor 2 Circuit High Voltage
P0AC8 2017 GMC Sierra — Hybrid/EV Battery Temperature Sensor 2 Circuit High Voltage
P0AC8 2018 GMC Sierra — Hybrid/EV Battery Temperature Sensor 2 Circuit High Voltage

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 P0AC8 GMC Code

1. What are the common symptoms of OBDII code P0AC8 in a GMC hybrid/EV vehicle?

The common symptoms of P0AC8 include the Check Engine light illuminating, reduced fuel efficiency, and potential issues with the hybrid or electric drive system.

2. What can cause the Hybrid/EV Battery Temperature Sensor 2 Circuit High Voltage code in a GMC vehicle?

This code is typically triggered by a malfunction in the temperature sensor itself, damaged wiring or connectors, or issues with the hybrid/EV battery system.

3. How can I diagnose the cause of OBDII code P0AC8 in my GMC hybrid/EV vehicle?

To diagnose P0AC8, you can use a scan tool to check for the specific fault code, inspect the temperature sensor and its wiring for damage, and perform a battery system test.

4. Is it safe to continue driving my GMC hybrid/EV vehicle with the P0AC8 code present?

It is not recommended to drive your vehicle with the P0AC8 code as it can lead to further damage to the hybrid/EV system. It's best to have the issue diagnosed and repaired promptly.

5. Can I repair the Hybrid/EV Battery Temperature Sensor 2 Circuit High Voltage code in my GMC myself?

While some DIY enthusiasts may attempt to replace the temperature sensor or repair the wiring, it's recommended to have a professional technician diagnose and repair the issue to ensure it is done correctly.

6. Will resetting the Check Engine light clear the P0AC8 code in my GMC vehicle?

Resetting the Check Engine light may temporarily clear the code, but if the underlying issue causing P0AC8 is not addressed, the code is likely to return.

7. How much does it typically cost to repair OBDII code P0AC8 in a GMC hybrid/EV vehicle?

The cost of repairing P0AC8 can vary depending on the specific cause of the issue, but it may involve sensor replacement, wiring repairs, or battery system troubleshooting, which can range from a few hundred to over a thousand dollars.

8. Are there any maintenance tips to prevent the Hybrid/EV Battery Temperature Sensor 2 Circuit High Voltage code in my GMC?

Regularly inspecting the hybrid/EV system components, keeping up with routine maintenance, and addressing any warning signs promptly can help prevent issues like P0AC8 from occurring.

9. Can extreme weather conditions affect the occurrence of OBDII code P0AC8 in a GMC hybrid/EV vehicle?

Extreme temperatures can impact the performance of the battery system and temperature sensors, potentially leading to the triggering of codes like P0AC8. It's important to monitor your vehicle's performance in varying weather conditions.

10. Will the P0AC8 code affect the overall drivability of my GMC hybrid/EV vehicle?

While the immediate drivability may not be significantly impacted by the P0AC8 code, continued driving with the issue unresolved can lead to further complications and potential damage to the hybrid/EV system.