P0AD4 Possible Causes

• Faulty hybrid battery pack cooling fan
• Hybrid battery cooling fan harness is open or shorted
• Poor electrical connection in hybrid battery pack cooling fan circuit

What Does It Mean?

How to Fix Code P0AD4

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.

P0AD4 Possible Symptoms

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

P0AD4 Meaning

The engine control module (ECM) monitors the hybrid battery pack airflow system circuit. The ECM sets the OBDII code when the hybrid battery airflow system circuit signal is outside factory specifications.

P0AD5 Possible Causes

• Faulty hybrid battery pack cooling fan
• Hybrid battery cooling fan circuit open or shorted
• Poor electrical connection in hybrid battery pack cooling fan circuit

What Does It Mean?

How to Fix Code P0AD5

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.

P0AD5 Possible Symptoms

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

P0AD5 Meaning

The engine control module (ECM) monitors the hybrid battery pack “A” air flow valve control circuit. The ECM sets the OBDII code when the signal from the hybrid battery pack A air flow valve control circuit is outside factory specifications.

P0AD6 Possible Causes

• Faulty hybrid battery pack cooling fan
• Hybrid battery cooling fan circuit open or shorted
• Poor electrical connection in hybrid battery pack cooling fan circuit

What Does It Mean?

How to Fix Code P0AD6

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.

P0AD6 Possible Symptoms

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

P0AD6 Meaning

The engine control module (ECM) monitors the hybrid battery pack “A” air flow valve control circuit. The ECM sets the OBDII code when the signal from the hybrid battery pack A air flow valve control circuit is outside factory specifications.

P0AD7 Possible Causes

• Faulty hybrid battery pack cooling fan
• Hybrid battery cooling fan circuit open or shorted
• Poor electrical connection in hybrid battery pack cooling fan circuit

What Does It Mean?

How to Fix Code P0AD7

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.

P0AD7 Possible Symptoms

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

P0AD7 Meaning

The engine control module (ECM) monitors the hybrid battery pack “A” air flow valve control circuit. The ECM sets the OBDII code when the signal from the hybrid battery pack A air flow valve control circuit is outside factory specifications.

P0AD8 Possible Causes

• Faulty hybrid battery pack cooling fan
• Hybrid battery cooling fan circuit open or shorted
• Poor electrical connection in hybrid battery pack cooling fan circuit

What Does It Mean?

How to Fix Code P0AD8

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.

P0AD8 Possible Symptoms

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

P0AD8 Meaning

The engine control module (ECM) monitors the hybrid battery pack “A” air flow valve control circuit. The ECM sets the OBDII code when the signal from the hybrid battery pack A air flow valve control circuit is outside factory specifications.

P0AD9 Possible Causes

• Faulty system main relay
• System main relay circuit open or shorted
• Poor electrical connection in system main relay circuit
• Faulty HV control ECU

What Does It Mean?

How to Fix Code P0AD9

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.

P0AD9 Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P0AD9 Meaning

SMRs (System Main Relays) connect and disconnect the high voltage power circuit according to requests from the HV control ECU. To ensure reliable operation, they consist of a total of 3 relays (1 for negative side and 2 for positive side).

To connect, SMR1 and SMR3 initially turn on. Then SMR2 activates and SMR1 turns off. This process protects the circuit from high voltage surge current by allowing limited current to flow through the resistor.
To disconnect, SMR2 and SMR3 turn off in that order. The HV control ECU verifies that the relays have properly closed.
The HV control ECU monitors the proper operation of SMRs (CON1, CON2 and CON3) to check for malfunction.

P0ADA Possible Causes

• Faulty system main relay
• System main relay circuit is open or shorted
• Poor electrical connection in the system main relay circuit
• Faulty HV control ECU

What Does It Mean?

How to Fix Code P0ADA

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.

P0ADA Possible Symptoms

Engine light on (or service engine soon warning light)

P0ADA Meaning

The SMRs (System Main Relays) connect and disconnect the high voltage power circuit according to requests from the HV control ECU. To ensure reliable operation, they consist of a total of 3 relays (1 for the negative side and 2 for the positive side).

To connect, SMR1 and SMR3 initially turn on. Then, SMR2 activates and SMR1 turns off. This process protects the circuit from high voltage surge current by allowing limited current to flow through the resistor.
To disconnect, SMR2 and SMR3 turn off in that order. The HV control ECU verifies that the relays have properly closed.
The HV control ECU monitors the proper operation of the SMRs (CON1, CON2, and CON3) to check for malfunction.

P0ADB Possible Causes

• Faulty system main relay
• System main relay harness is open or shorted
• Poor electrical connection in system main relay circuit
• Faulty HV control ECU

What Does It Mean?

How to Fix P0ADB Code

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.

P0ADB Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P0ADB Meaning

The SMRs (System Main Relays) connect and disconnect the high voltage power circuit according to requests from the HV control ECU. To ensure reliable operation, they consist of a total of 3 relays (1 for negative side and 2 for positive side).

To connect, SMR1 and SMR3 initially turn on. Then SMR2 activates and SMR1 turns off. This process protects the circuit from high voltage inrush current by allowing limited current to flow through the resistor.
To disconnect, SMR2 and SMR3 turn off in that order. The HV control ECU verifies that the relays have properly closed.
The HV control ECU monitors the proper operation of SMRs (CON1, CON2 and CON3) to check for malfunction.

P0ADC Possible Causes

• Faulty system main relay
• System main relay circuit open or shorted
• Poor electrical connection in system main relay circuit
• Faulty HV control ECU

What Does It Mean?

How to Fix Code P0ADC

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.

P0ADC Possible Symptoms

Illuminated MIL (Malfunction Indicator Light) or soon-to-illuminate service engine light

P0ADC Meaning

SMRs (System Main Relays) connect and disconnect the high voltage power circuit according to requests from the HV control ECU. To ensure reliable operation, they consist of a total of 3 relays (1 for the negative side and 2 for the positive side).

To connect, SMR1 and SMR3 initially turn on. Then SMR2 activates and SMR1 turns off. This process protects the circuit from high voltage surge current by allowing limited current to flow through the resistor.
To disconnect, SMR2 and SMR3 turn off in that order. The HV control ECU verifies that the relays have properly closed.
The HV control ECU monitors the proper operation of SMRs (CON1, CON2 and CON3) to check for malfunction.

P0ADD Possible Causes

• Faulty system main relay
• System main relay circuit is open or shorted
• Poor electrical connection in the system main relay circuit
• Faulty HV control ECU

What Does It Mean?

How to Fix Code P0ADD

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.

P0ADD Possible Symptoms

Engine light on (or service engine soon warning light)

P0ADD Meaning

The SMRs (System Main Relays) connect and disconnect the high voltage power circuit according to requests from the HV control ECU. To ensure reliable operation, they consist of a total of 3 relays (1 for the negative side and 2 for the positive side).

To connect, SMR1 and SMR3 initially turn on. Then, SMR2 activates and SMR1 turns off. This process protects the circuit from high voltage inrush current by allowing the current to flow through the limiting resistor.
To disconnect, SMR2 and SMR3 turn off in that order. The HV control ECU verifies that the relays have properly closed.
The HV control ECU monitors the proper operation of the SMRs (CON1, CON2, and CON3) to check for malfunction.