P0AC0 Hybrid Battery Block Current Sensor “A” Circuit Range/Performance

P0AC0 Possible Causes

  • Hybrid battery junction block
  • Faulty battery intelligent unit
  • Battery intelligent unit harness is open or shorted
  • Poor electrical connection in battery intelligent unit circuit

What Does It Mean?

How to Fix Code P0AC0

Check 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 pins.

P0AC0 Possible Symptoms

Check engine light illuminated (or service engine soon warning light)

P0AC0 Meaning

The battery current sensor, which is mounted on the positive side of the HV battery assembly cable, detects the amperage flowing into the HV battery. The battery intelligent unit inputs a voltage, varying between 0 and 5 V proportionally to the amperage, into the IB terminal from the battery current sensor. A battery current sensor output voltage lower than 2.5 V indicates that the HV battery is discharging, and higher than 2.5 V indicates that the HV battery is charging. The power management control ECU determines the HV battery’s charging and discharging amperage based on the

P0AC1 Hybrid Battery Block “A” Low Current Sensor Circuit

P0AC1 Possible Causes

  • Hybrid battery junction block
  • Faulty battery intelligent unit
  • Battery intelligent unit harness is open or shorted
  • Poor electrical connection in battery intelligent unit circuit

What Does It Mean?

How to Fix Code P0AC1

Check 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 pins.

P0AC1 Possible Symptoms

Check engine light illuminated (or service engine soon warning light)

P0AC1 Meaning

The battery current sensor, which is mounted on the positive side of the HV battery assembly cable, detects the amperage flowing into the HV battery. The battery intelligent unit inputs a voltage, varying between 0 and 5 V proportionally to the amperage, into terminal IB from the battery current sensor. A battery current sensor output voltage lower than 2.5 V indicates the HV battery is discharging, and higher than 2.5 V indicates the HV battery is charging. The power management control ECU determines the HV battery’s charging and discharging amperage based on the

P0AC2 High Value of Hybrid Battery Block Current Sensor “A” Circuit

P0AC2 Possible Causes

  • Hybrid battery junction block
  • Faulty battery intelligent unit
  • Battery intelligent unit harness is open or shorted
  • Poor electrical connection in battery intelligent unit circuit

What Does It Mean?

How to Fix Code P0AC2

Check 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 pins.

P0AC2 Possible Symptoms

Illuminated check engine light (or service engine soon warning light)

P0AC2 Meaning

The battery current sensor, which is mounted on the positive side of the HV battery assembly cable, detects the amperage flowing into the HV battery. The battery intelligent unit inputs a voltage, varying between 0 and 5 V proportionally to the amperage, into terminal IB from the battery current sensor. A battery current sensor output voltage lower than 2.5 V indicates that the HV battery is discharging, and higher than 2.5 V indicates that the HV battery is charging. The power management control ECU determines the HV battery’s charging and discharging amperage based on

P0AC3 Hybrid Battery Pack “A” Current Sensor Circuit, Intermittent/Erratic

P0AC3 Possible Causes

  • Hybrid battery junction block
  • Faulty battery intelligent unit
  • Battery intelligent unit harness is open or shorted
  • Poor electrical connection in battery intelligent unit circuit

What Does It Mean?

How to Fix Code P0AC3

Check the “possible causes” listed above. Visually inspect the related cable harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P0AC3 Possible Symptoms

Engine light on (or service engine soon warning light)

P0AC3 Meaning

The battery current sensor, which is mounted on the positive side of the HV battery assembly cable, detects the amperage flowing into the HV battery. The battery intelligent unit inputs a voltage, varying between 0 and 5 V proportionally to the amperage, into terminal IB from the battery current sensor. A battery current sensor output voltage lower than 2.5 V indicates that the HV battery is discharging, and higher than 2.5 V indicates that the HV battery is charging. The power management control ECU determines the HV battery’s charging and discharging amperage based on the
OBDII Code P0AC3 – Hybrid Battery Pack Current Sensor Circuit “A” Intermittent/Erratic

P0AC4 MIL illumination requested by hybrid powertrain control module

P0AC4 Possible Causes

  • Faulty hybrid powertrain control module
  • Hybrid powertrain control module harness is open or shorted
  • Poor electrical connection in hybrid powertrain control module circuit

What Does It Mean?

How to Fix Code P0AC4

Check 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 pins.

P0AC4 Technical Notes

The P0AC4 code is only an informational code. If there are no other engine codes, the hybrid powertrain control module should be diagnosed.

P0AC4 Possible Symptoms

Engine light on (or service engine soon warning light)

P0AC4 Meaning

The P0AC4 code indicates that the hybrid powertrain control module has set a hybrid powertrain code related to emissions. The hybrid powertrain control module sends a message via the serial data circuit to the engine control module (ECM) requesting illumination of the malfunction indicator light (MIL). When the ECM receives the message, the P0AC4 code is set. The P0AC4 code information for the ECM will only display the P0AC4 code, but the freeze frame/failure record data may display the hybrid powertrain code that is set.

Hybrid Battery Temperature Sensor “B” Circuit

P0AC5 Possible Causes

  • Faulty HV battery assembly (HV battery temperature sensor)
  • HV battery assembly harness is open or shorted
  • Poor electrical connection in HV battery assembly circuit
  • Faulty battery intelligent unit

What Does It Mean?

How to Fix Code P0AC5

Check the “possible causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P0AC5 Possible Symptoms

Engine light on (or service engine soon warning light)

P0AC5 Meaning

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

Hybrid Battery Temperature Sensor “B” Range/Performance

P0AC6 Possible Causes

  • Faulty HV battery assembly (HV battery temperature sensor)
  • HV battery assembly harness is open or shorted
  • Poor electrical connection in HV battery assembly circuit
  • Faulty battery intelligent unit

What Does It Mean?

How to Fix Code P0AC6

Check 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 pins.

P0AC6 Possible Symptoms

Illuminated MIL (Malfunction Indicator Lamp) (or soon service engine warning light)

P0AC6 Meaning

The battery temperature sensors are provided at 3 locations in the HV battery. The thermistor resistance, built into each battery temperature sensor, varies according to changes in HV battery temperature. The lower the battery temperature, the higher the thermistor resistance. Conversely, the higher the temperature, the lower the resistance. The battery intelligent unit uses the battery temperature sensors to detect 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 fan. (The fan starts when the HV battery temperature exceeds a predetermined level.)

P0AC7 Low Voltage in Hybrid Battery Temperature Sensor Circuit “B

P0AC7 Possible Causes

  • Faulty HV battery assembly (HV battery temperature sensor)
  • HV battery assembly harness is open or shorted
  • Poor electrical connection in HV battery assembly circuit
  • Faulty battery intelligent unit

What Does It Mean?

How to Fix Code P0AC7

Check 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 pins.

P0AC7 Possible Symptoms

Engine light on (or service engine soon warning light)

P0AC7 Meaning

Battery temperature sensors are provided at 3 locations in the HV battery. The thermistor resistance, built into each battery temperature sensor, varies according to changes in HV battery temperature. The lower the battery temperature, the higher the thermistor resistance. Conversely, the higher the temperature, the lower the resistance. The battery intelligent unit uses the battery temperature sensors to detect HV battery temperature and sends the detected value to the power management control ECU. Based on the detection results, the power management control ECU controls the fan motor. (The fan motor starts when the HV battery temperature exceeds a predetermined level.)

P0AC8 High Voltage in Hybrid Battery Temperature Sensor Circuit “B

P0AC8 Possible Causes

  • Faulty HV battery assembly (HV battery temperature sensor)
  • HV battery assembly harness is open or shorted
  • Poor electrical connection in HV battery assembly circuit
  • Faulty battery intelligent unit

What Does It Mean?

How to Fix Code P0AC8

Check 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 pins.

P0AC8 Possible Symptoms

Engine light on (or service engine soon warning light)

P0AC8 Meaning

Battery temperature sensors are provided at 3 locations in the HV battery. The thermistor resistance, built into each battery temperature sensor, varies according to changes in HV battery temperature. The lower the battery temperature, the higher the thermistor resistance. Conversely, the higher the temperature, the lower the resistance. The battery intelligent unit uses the battery temperature sensors to detect HV battery temperature and sends the detected value to the power management control ECU. Based on the detection results, the power management control ECU controls the fan. (The fan starts when the HV battery temperature exceeds a predetermined level.)

Hybrid Battery Temperature Sensor “B” Circuit Intermittent / Irregular

P0AC9 Possible Causes

  • Faulty HV battery assembly (HV battery temperature sensor)
  • HV battery assembly harness is open or shorted
  • Poor electrical connection in HV battery assembly circuit
  • Faulty battery intelligent unit

What Does It Mean?

How to Fix Code P0AC9

Check the “possible causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P0AC9 Possible Symptoms

Engine light on (or service engine soon warning light)

P0AC9 Meaning

The battery temperature sensors are provided at 3 locations in the HV battery. The thermistor resistance, built into each battery temperature sensor, varies according to changes in HV battery temperature. The lower the battery temperature, the higher the thermistor resistance. Conversely, the higher the temperature, the lower the resistance. The battery intelligent unit uses the battery temperature sensors to detect 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 fan. (The fan starts when the HV battery temperature exceeds a predetermined level.)