AutoCodes – Toyota – P0AAC Toyota

P0AAC Toyota Code - Hybrid Battery Pack Air Temperature Sensor 'A' Circuit

Quick Answer

The intake air temperature sensor is provided on the HV battery assembly. Common causes include Faulty HV Battery Assembly (Intake Air 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: P0AAC Toyota indicates Hybrid Battery Pack Air Temperature Sensor 'A' Circuit.
Common causes: Common causes include Faulty HV Battery Assembly (Intake Air 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 4,478

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 May 11, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0AAC Toyota Description

The intake air temperature sensor is provided on the HV battery assembly. Its resistance value varies with the changes in the intake air temperature. The characteristics of the intake air temperature sensor are the same as the battery temperature sensors.
The battery ECU uses the signals from the intake air temperature sensor for adjusting the air flow speed of the battery blower assembly

OBDII Code P0AAC Toyota - Hybrid Battery Pack Air Temperature Sensor 'A' Circuit - AutoCodes.com — P0AAC Toyota Code - Hybrid Battery Pack Air Temperature Sensor 'A' Circuit

What does this mean?

What are the Possible Causes of the DTC P0AAC Toyota?

Faulty HV Battery Assembly (Intake Air Temperature Sensor)
HV Battery Assembly harness is open or shorted
HV Battery Assembly circuit poor electrical connection
Faulty Battery ECU

How to Fix the DTC P0AAC 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 P0AAC 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.