P0AC8 2018 GMC Sierra 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 2018 GMC Sierra 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.
Code P0AC8 2018 GMC Sierra Description
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).
What are the Possible Causes of the DTC P0AC8 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 P0AC8 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 P0AC8 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.
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Frequently Asked Questions about P0AC8 2018 GMC Sierra Code
1. What does the OBDII code P0AC8 mean on a 2018 GMC Sierra?
P0AC8 indicates a problem with the Hybrid/EV Battery Temperature Sensor 2 Circuit, specifically showing a high voltage condition that suggests an issue with the sensor or its wiring.
2. What are the common symptoms of code P0AC8 on a 2018 GMC Sierra?
Symptoms may include an illuminated check engine light, reduced hybrid or EV performance, limited power mode activation, or erratic battery temperature readings.
3. What causes the P0AC8 code to appear on a 2018 GMC Sierra?
Common causes include a faulty battery temperature sensor, damaged or corroded wiring, poor electrical connections, or a malfunctioning hybrid battery control module.
4. Can I drive my 2018 GMC Sierra with the P0AC8 code?
While the truck may still be drivable, it’s not recommended to continue driving without addressing the issue, as it could lead to further hybrid system damage or reduced performance.
5. How do I diagnose the P0AC8 code on a 2018 GMC Sierra?
Start by inspecting the battery temperature sensor wiring and connectors for damage or corrosion. Use a multimeter to test the sensor’s resistance and ensure the circuit voltage aligns with manufacturer specifications.
6. How is the P0AC8 code fixed on a 2018 GMC Sierra?
Repairs may involve replacing the Hybrid/EV Battery Temperature Sensor 2, repairing or replacing damaged wiring, cleaning corroded connections, or reprogramming the hybrid battery control module.
7. How much does it cost to fix the P0AC8 code on a 2018 GMC Sierra?
Repair costs can vary widely, ranging from $100 to $500 or more, depending on whether the issue is with the sensor, wiring, or control module.
8. Can a dead hybrid battery cause the P0AC8 code on a 2018 GMC Sierra?
While a failing hybrid battery isn’t a direct cause of this code, improper temperature readings from the sensor could affect the battery’s performance or lead to misdiagnosis.
9. Does the P0AC8 code affect fuel efficiency on a 2018 GMC Sierra?
Yes, this code can reduce fuel efficiency since the hybrid system may not operate optimally or could enter a reduced power mode.
10. Do I need special tools to fix the P0AC8 code on a 2018 GMC Sierra?
Yes, tools like an OBDII scanner, multimeter, and possibly a diagnostic scan tool capable of communicating with the hybrid system will be necessary for accurate diagnosis and repair.
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