AutoCodes – Generic – P0AC7

P0AC7 Code - Hybrid/EV Battery Temperature Sensor 2 Circuit Low 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: P0AC7 indicates Hybrid/EV Battery Temperature Sensor 2 Circuit Low 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 3,994

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 P0AC7 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 greater than 160°C (320°F).

OBDII Code P0AC7 - Hybrid/EV Battery Temperature Sensor 2 Circuit Low Voltage - AutoCodes.com — P0AC7 Code - Hybrid/EV Battery Temperature Sensor 2 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0AC7?

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 P0AC7?

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 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 P0AC7 code?

Need more information on how to fix the P0AC7 code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific Makes

P0AC7 Buick — Hybrid/EV Battery Temperature Sensor 2 Circuit Low Voltage
P0AC7 Cadillac — Hybrid/EV Battery Temperature Sensor 2 Circuit Low Voltage
P0AC7 Chevrolet — Hybrid/EV Battery Temperature Sensor 2 Circuit Low Voltage
P0AC7 GMC — Hybrid/EV Battery Temperature Sensor 2 Circuit Low Voltage
P0AC7 Lexus — Hybrid Battery Temperature Sensor 'B' Circuit Low
P0AC7 Toyota — Hybrid Battery Temperature Sensor 'B' Circuit Low

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 P0AC7 Code

What does the OBDII code P0AC7 mean?

P0AC7 indicates that the Hybrid/EV Battery Temperature Sensor 2 circuit is reporting a low voltage, suggesting a potential issue with the sensor, wiring, or related components.

What are the symptoms of a P0AC7 code?

Symptoms may include the hybrid/EV system warning light, reduced fuel efficiency, limited EV functionality, or restricted vehicle performance.

What causes a P0AC7 code?

Common causes include a faulty temperature sensor, damaged or corroded wiring, poor electrical connections, or an issue with the hybrid/EV battery control module.

Can I drive my car with a P0AC7 code?

It’s possible to drive, but it’s not recommended as the vehicle may enter a limited performance mode, and continued driving could cause further damage to the hybrid/EV battery system.

How is a P0AC7 code diagnosed?

A technician will use a scan tool to retrieve the code, inspect the battery temperature sensor and associated wiring, and test the circuit for proper voltage and continuity.

How do you fix a P0AC7 code?

Repairs may involve replacing the faulty temperature sensor, repairing damaged wiring, cleaning or securing electrical connections, or reprogramming the hybrid/EV battery control module if needed.

Can a dead hybrid/EV battery cause a P0AC7 code?

Not directly, but an aging or failing hybrid/EV battery could put additional strain on the temperature sensors, potentially leading to related circuit issues.

What tools are needed to troubleshoot a P0AC7 code?

You’ll typically need an OBDII scan tool, a digital multimeter, and possibly wiring diagrams for your vehicle's hybrid/EV battery system.

Will resetting the code fix the problem?

Clearing the code may temporarily turn off the warning light, but if the underlying issue isn’t resolved, the code will likely return.

How much does it cost to fix a P0AC7 code?

Repair costs vary depending on the issue, ranging from $100 to $300 for sensor replacement, with higher costs if additional wiring or module repairs are needed.