Engine-Codes - Generic - P0AC9

P0AC9 Code - Hybrid Battery Temperature Sensor 'B' Circuit Intermittent/Erratic

- Code Popularity: 1,359 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the P0AC9 Code?

  • 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 P0AC9 Code?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|What is the cost to diagnose the P0AC9 code?

Labor: 1.0

The cost to diagnose the P0AC9 code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|What are P0AC9 code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|What Does the P0AC9 Code Mean?

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.)

Hybrid Battery Temperature Sensor 'B' Circuit Intermittent/Erratic

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|P0AC9 code information for specific makes

  • P0AC9 LEXUS Hybrid Battery Temperature Sensor 'B' Circuit Intermittent/Erratic
  • P0AC9 TOYOTA Hybrid Battery Temperature Sensor 'B' Circuit Intermittent/Erratic

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