P0C49 Possible Causes

• Faulty hybrid battery cooling pump
• Hybrid battery cooling pump wiring harness open or short circuit
• Poor electrical connection in hybrid battery module cooling pump circuit

What Does It Mean?

How to Fix Code P0C49

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.

P0C49 Possible Symptoms

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

P0C49 Meaning

The engine control module (ECM) monitors the hybrid battery pack cooling pump. The ECM sets the OBDII code when the hybrid battery cooling pump does not meet factory specifications.

P0C4A Possible Causes

• Faulty hybrid/EV battery cooling pump
• Hybrid/EV battery cooling pump wiring harness open or shorted
• Poor electrical connection in hybrid/EV battery cooling pump circuit

What Does It Mean?

How to Fix Code P0C4A

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.

P0C4A Possible Symptoms

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

P0C4A Meaning

The hybrid/EV battery pack cooling pump circulates coolant through the drive motor battery cooling radiator, drive motor battery cooling cooler, and hybrid/EV battery pack to control the temperature of the hybrid/EV battery pack. An activation signal from the hybrid/EV powertrain control module 2 to the hybrid/EV battery pack cooling pump provides overall pump control. When this circuit is high, the pump can operate. The pump is controlled by a pulse width modulated signal from the hybrid/EV powertrain control module 2 to the hybrid/EV battery pack cooling pump. The higher the duty cycle, the higher the pump speed. The hybrid/EV battery cooling pump provides a hardwired pulse width modulated feedback signal to the hybrid/EV powertrain control module 2. During normal operation, this feedback signal provides pump speed information to the hybrid/EV powertrain control module 2. The hybrid/EV battery pack cooling pump has self-diagnostic capability. If the hybrid/EV battery cooling pump determines there is an internal fault, it provides this information on this same feedback circuit instead of the pump speed information.

P0C4B Possible Causes

• Faulty hybrid battery cooling pump
• Hybrid battery cooling pump circuit open or shorted
• Poor electrical connection in hybrid battery module cooling pump circuit

What Does It Mean?

How to Fix Code P0C4B

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.

P0C4B Possible Symptoms

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

P0C4B Meaning

The engine control module (ECM) monitors the hybrid battery pack cooling pump. The ECM sets the OBDII code when the hybrid battery cooling pump doesn’t meet factory specifications.

P0C4C Possible Causes

• Faulty hybrid battery cooling pump
• Hybrid battery cooling pump wiring harness is open or short-circuited
• Poor electrical connection in the hybrid battery module cooling pump circuit

What Does It Mean?

How to Fix Code P0C4C

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.

P0C4C Possible Symptoms

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

P0C4C Meaning

The engine control module (ECM) monitors the hybrid battery pack cooling pump. The ECM sets the OBDII code when the hybrid battery cooling pump does not meet factory specifications…

P0C4D Possible Causes

• Faulty hybrid battery cooling pump
• Hybrid battery cooling pump circuit open or shorted
• Poor electrical connection in hybrid battery module cooling pump circuit

What Does It Mean?

How to Fix Code P0C4D

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.

P0C4D Possible Symptoms

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

P0C4D Meaning

The engine control module (ECM) monitors the hybrid battery pack cooling pump. The ECM sets the OBDII code when the hybrid battery cooling pump does not meet factory specifications.

P0C4E Possible Causes

• Faulty hybrid vehicle motor
• Hybrid vehicle motor wiring harness open or short-circuited
• Poor electrical connection in hybrid vehicle motor circuit
• Faulty HV control ECU

What Does It Mean?

How to Fix P0C4E Code

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.

P0C4E Possible Symptoms

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

P0C4E Meaning

The motor resolver is a type of sensor that detects the position of magnetic poles, essential for ensuring highly efficient control of MG1 and MG2.
The resolver stator contains an excitation coil and two detection coils. Because the rotor has an oval shape, the gap between the stator and rotor changes as the rotor rotates. An alternating current with a predetermined frequency flows through the excitation coil, and the S and C detection coils generate alternating currents according to the sensor rotor position.
The HV control ECU detects the absolute rotor position based on the phases of the S and C detection coils and the height of their waveform. Additionally, the CPU calculates the amount of position change within a predetermined time period, to use the resolver as a speed sensor.

P0C4F Possible Causes

• Faulty hybrid vehicle motor
• Hybrid vehicle motor wiring harness open or short-circuited
• Poor electrical connection in hybrid vehicle motor circuit
• Faulty HV control ECU

What Does It Mean?

How to Fix P0C4F Code

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.

P0C4F Possible Symptoms

Engine light on (or service engine soon warning light)

P0C4F Meaning

The motor resolver is a type of sensor that detects magnetic pole positions, essential for ensuring highly efficient control of MG1 and MG2.
The resolver stator contains an excitation coil and two detection coils. Because the rotor has an oval shape, the gap between the stator and rotor changes as the rotor rotates. An alternating current with a predetermined frequency flows through the excitation coil, and the S and C detection coils generate alternating currents according to the sensor rotor position.
The HV control ECU detects the absolute rotor position based on the phases of the S and C detection coils and their waveform height. Additionally, the CPU calculates the amount of position change within a predetermined time period to use the resolver as a speed sensor.

P0C50 Possible Causes

• Faulty hybrid vehicle motor
• Hybrid vehicle motor wiring harness is open or short-circuited
• Poor electrical connection of the hybrid vehicle motor circuit
• Faulty HV control ECU

What Does It Mean?

How to Fix Code P0C50

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.

P0C50 Possible Symptoms

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

P0C50 Meaning

The motor resolver is a type of sensor that detects the position of magnetic poles, essential for ensuring highly efficient control of MG1 and MG2.
The resolver stator contains an excitation coil and two detection coils. Because the rotor has an oval shape, the gap between the stator and rotor changes as the rotor rotates. An alternating current with a predetermined frequency flows through the excitation coil, and the S and C detection coils produce alternating currents according to the sensor rotor position.
The HV control ECU detects the absolute position of the rotor based on the phases of the S and C detection coils and the height of their waveform. Additionally, the CPU calculates the amount of position change within a predetermined time period to use the resolver as a speed sensor.

P0C51 Possible Causes

• Faulty hybrid vehicle motor
• Hybrid vehicle motor wiring harness is open or short-circuited
• Poor electrical connection in the hybrid vehicle motor circuit
• Faulty HV control ECU

What Does It Mean?

How to Fix Code P0C51

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.

P0C51 Possible Symptoms

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

P0C51 Meaning

The motor resolver is a type of sensor that detects the position of magnetic poles, essential for ensuring highly efficient control of MG1 and MG2.
The resolver stator contains an excitation coil and two detection coils. Because the rotor has an oval shape, the gap between the stator and rotor changes as the rotor rotates. An alternating current with a predetermined frequency flows through the excitation coil, and the S and C detection coils produce alternating currents according to the position of the sensor rotor.
The HV control ECU detects the absolute position of the rotor based on the phases of the S and C detection coils and the height of their waveform. Additionally, the CPU calculates the amount of position change within a predetermined time period, in order to use the resolver as a speed sensor.

P0C52 Possible Causes

• Faulty drive motor generator
• Drive motor harness is open or shorted
• Poor electrical connection in drive motor generator circuit

What Does It Mean?

How to Fix Code P0C52

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

P0C52 Possible Symptoms

Engine light on (or service engine soon warning light)

P0C52 Meaning

The drive motor position sensor is monitored by the motor control module. The motor control module monitors the angular position, speed, and direction of the drive motor generator rotor based on signals from the resolver-type position sensor. The position sensor contains one drive coil, two driven coils, and an irregularly shaped metal rotor. The metal rotor is mechanically attached to the drive motor-generator shaft. When the vehicle is turned on, the motor control module sends a 7 volt AC, 10 kHz excitation signal to the drive coil. The drive coil excitation signal creates a magnetic field surrounding the two driven coils and the irregularly shaped rotor. The motor control module then monitors the two driven coil circuits for a return signal. The position of the irregular metal rotor causes the magnetically induced return signals from the driven coils to vary in size and shape. Comparing the two signals from the driven coils allows the motor control module to determine the exact position, speed, and direction of the drive motor-generator rotor. The position sensor is a non-repairable part of the drive motor.