AutoCodes – Toyota – P0AC8 Toyota

P0AC8 Toyota Code - Hybrid Battery Temperature Sensor 'B' Circuit High

Quick Answer

The battery temperature sensors are provided at 3 locations of the HV battery. Common causes include Faulty HV Battery Assembly (HV battery temperature sensor), HV Battery Assembly harness is open or shorted, HV 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 Toyota indicates Hybrid Battery Temperature Sensor 'B' Circuit High.
Common causes: Common causes include Faulty HV Battery Assembly (HV battery temperature sensor), HV Battery Assembly harness is open or shorted, HV 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 2,579

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 Jul 27, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0AC8 Toyota Description

The battery temperature sensors are provided at 3 locations of the HV battery. The resistance of the thermistor, which is built into each battery temperature sensor, varies in accordance with changes in the HV battery temperature. The lower the battery temperature, the higher the thermistor resistance. Conversely, the higher the temperature, the lower the resistance. The battery smart unit uses the battery temperature sensors to detect the HV battery temperature, and sends the detected value to the power management control ECU. Based on the results of this detection, the power management control ECU controls the blower fan. (The blower fan starts when HV battery temperature rises above a predetermined level.)

OBDII Code P0AC8 Toyota - Hybrid Battery Temperature Sensor 'B' Circuit High - AutoCodes.com — P0AC8 Toyota Code - Hybrid Battery Temperature Sensor 'B' Circuit High

What does this mean?

What are the Possible Causes of the DTC P0AC8 Toyota?

Faulty HV Battery Assembly (HV battery temperature sensor)
HV Battery Assembly harness is open or shorted
HV Battery Assembly circuit poor electrical connection
Faulty Battery smart unit

How to Fix the DTC P0AC8 Toyota?

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 Toyota 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 Toyota code?

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

Need Help with the Code?

Get the P0AC8 Toyota code diagnosed by a professional: Find a repair shop in your area

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 Toyota Code

1. What are the common symptoms of OBDII code P0AC8 in a Toyota hybrid?

The common symptoms include poor fuel efficiency, a drop in overall performance, and the illumination of the check engine light.

2. What does the OBDII code P0AC8 Toyota indicate?

The code P0AC8 indicates a malfunction in the Hybrid Battery Temperature Sensor 'B' Circuit, specifically that the sensor is reading a high temperature.

3. What are some possible causes of the Hybrid Battery Temperature Sensor 'B' Circuit High error?

Possible causes include a faulty temperature sensor, damaged wiring or connectors in the circuit, or issues with the hybrid battery itself.

4. How can I diagnose the issue related to code P0AC8 in my Toyota hybrid?

Diagnosis typically involves using a scan tool to retrieve the code, checking the wiring and connectors for any damage, and testing the temperature sensor for proper function.

5. Can I continue driving my Toyota with the P0AC8 code present?

It is not recommended to continue driving the vehicle with the P0AC8 code present, as it can lead to further damage to the hybrid battery system and potentially affect the vehicle's overall performance.

6. Is it possible to repair the Hybrid Battery Temperature Sensor 'B' Circuit High issue myself?

While some simple wiring or connector repairs may be possible for DIY enthusiasts, diagnosing and repairing issues related to the hybrid battery system, including the temperature sensor, is best left to professional technicians.

7. How much does it typically cost to repair the Hybrid Battery Temperature Sensor 'B' Circuit High error in a Toyota hybrid?

The cost of repairs can vary depending on the exact cause of the issue, but it is recommended to budget for potentially significant expenses due to the complexity of the hybrid system.

8. Are there any preventive maintenance tips to avoid the P0AC8 code in a Toyota hybrid?

Regularly monitoring the hybrid system, keeping up with scheduled maintenance, and addressing any warning lights promptly can help prevent issues like the Hybrid Battery Temperature Sensor 'B' Circuit High error.

9. Can a faulty Hybrid Battery Temperature Sensor 'B' Circuit High error affect the safety of driving my Toyota hybrid?

While the immediate safety risk may be low, driving with unresolved hybrid battery system issues can impact the overall safety and reliability of the vehicle, especially in the long run.

10. How long does it typically take to repair the P0AC8 code in a Toyota hybrid?

The repair time can vary based on the exact cause of the issue and the availability of parts, but it is advisable to consult with a professional technician for an accurate estimate.