P0AC9 2018 GMC Sierra Code - Hybrid/EV Battery Temperature Sensor 2 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
- P0AC9 2018 GMC Sierra indicates Hybrid/EV Battery Temperature Sensor 2 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.
Code P0AC9 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 intermittent or has changed by 10°C (18°F) or greater for 4 out of 5 seconds.
What are the Possible Causes of the DTC P0AC9 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 P0AC9 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 P0AC9 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 P0AC9 2018 GMC Sierra code?
Need more information on how to fix the P0AC9 2018 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0AC9 2018 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0AC9 2018 GMC Sierra Code
1. What does the OBDII code P0AC9 mean on a 2018 GMC Sierra?
The code P0AC9 indicates an issue with the Hybrid/EV Battery Temperature Sensor 2 Circuit, specifically detecting an erratic signal.
2. What are the symptoms of P0AC9 in a 2018 GMC Sierra?
Common symptoms include the check engine light turning on, reduced hybrid system performance, and possible overheating or improper regulation of the hybrid battery.
3. What causes the P0AC9 code to appear?
Causes may include a faulty battery temperature sensor, damaged wiring or connectors in the sensor circuit, or an issue with the hybrid battery control module.
4. Can I drive my 2018 GMC Sierra with a P0AC9 code?
It is not recommended to drive the vehicle for extended periods as the hybrid battery system may not function optimally, potentially leading to further damage.
5. How is the P0AC9 code diagnosed?
A mechanic will use a scan tool to monitor the sensor's data, inspect the wiring and connections, and test the battery temperature sensor for proper operation.
6. How do you fix the P0AC9 code on a 2018 GMC Sierra?
Repairs may involve replacing the faulty temperature sensor, repairing damaged wires or connectors, or reprogramming/updating the hybrid battery control module.
7. What is the cost of repairing a P0AC9 code?
Repair costs vary but typically range from $150 to $400, depending on whether the sensor, wiring, or control module needs replacement.
8. Can a weak hybrid battery cause the P0AC9 code?
While rare, a degraded or faulty hybrid battery could contribute to erratic temperature sensor readings, but the sensor or its circuit is more likely the issue.
9. How can I prevent the P0AC9 code from recurring?
Regular inspection of the hybrid system, especially the wiring and sensors, can help detect and address potential issues before they trigger the code.
10. Do I need to reset the code after fixing the issue?
Yes, after completing repairs, the code should be cleared with a scan tool to ensure the problem is resolved and the check engine light turns off.
Discuss the causes and fixes for P0AC9 2018 GMC Sierra OBDII Code
Code P0AC9 2018 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
