AutoCodes – Toyota – P0AC7 Toyota

P0AC7 Toyota Code - Hybrid Battery Temperature Sensor 'B' Circuit Low

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: P0AC7 Toyota indicates Hybrid Battery Temperature Sensor 'B' Circuit Low.
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.

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Code Popularity 2,106

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
Comments
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Code P0AC7 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 P0AC7 Toyota - Hybrid Battery Temperature Sensor 'B' Circuit Low - AutoCodes.com — P0AC7 Toyota Code - Hybrid Battery Temperature Sensor 'B' Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0AC7 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 P0AC7 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 P0AC7 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.

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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.