Guide To P0BC9 OBD Error Code Solutions

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The trouble code P0BC9 can be explained as Hybrid Battery Pack Cooling Fan Sense Circuit Low Issue. It is important to know that the faulty cooling fan can severely affect the engine performance as well as the generator motor performance. Also affected by the sluggish acceleration and the braking risk, the OBD code P0BC9 error code gets stored in the PCM indicating problematic hybrid battery cooling system.

When the generator motor detects any out of the normal voltage differences in the cooling fan circuit, it stores the specific OBD code error. When the ECU senses a variable voltage signal from the fan, it means high temperatures. Thus, code P0BC9 error gets stored in the system and thus the vehicle can go into limp mode.

What Causes this problem with the Hybrid Battery Pack Cooling Fan Sense Circuit Low?

• Burnt, damaged, shorted, disconnected, or corroded wiring and/or connectors
• Defective coolant pump actuator and coolant control solenoid
• Defective hybrid motor cooling fan
• Mechanical defects of the temperature sensor
• Defective, or malfunctioning generator motor
• Faulty ECU or PCM that might need reprogramming

1. Inverter Cooler Pump - As part of the cooling system, the inverter coolant pump translates high-voltage direct current generated by hybrid batteries into alternating current for the motor to keep the system at the proper operating temperature. Thus, if the cooler pump if faulty, it should be replaced immediately.
2. Battery Temperature Sensor - A symptom commonly associated with a failing battery temperature sensor is an engine that surges during operation. The battery temperature sensor helps the system continuously adjusts the system voltage, and if it fails, this process may be disturbed. Thus, replace it now!
3. Powertrain Control Module - Faulty PCM can cause check engine light to illuminate on the dashboard along with many performance issues like engine or motor stalling and not starting as well as poor acceleration and throttle response. Buy new PCM components now!
4. Electronic Control Unit - If the ECU is at fault, it will not be able to read the boost converter temperatures correctly leading to underperformance. Thus, replace faulty ECU now!
5. Diagnostic Tool - Use high grade diagnostic tools and equipment to resolve OBD code error. Buy new tools and equipment form us now!
6. Cooling Fan - Inspect for faults in the hybrid battery cooling fan and replace or repair it immediately or the battery may overheat and under perform. Thus, replace it now!

Willing to know some common symptoms of OBD Code P0BC9? Your wish is our demand. Have a look at them below:

Common Symptoms

• Malfunction indicator light on
• Increase in converter temperatures
• Affected drivability

We have listed out so ways which would help you to correct the occurrence of OBD Code P0BC9. They are mentioned here as follows:

• Defective hybrid battery pack cooling fan harness replacement
• Faulty boost converter temperature sensor replacement
• Repair or replace bad hybrid battery thermistor
• Hybrid battery pack switch replacement
• Hybrid battery pack circuit repairs 

There is no need to get strained if your OBD Code is still flashing up as we are here at your service. Have a look at our superior variety of ECM, Hybrid Battery, Cooling Fan, Voltage Battery, Starter, Generator and many more. Now all your problems would vanish within no time.

If you want to easily diagnose this fault code, then all you have to do is to follow the steps which are mentioned below:

• The mechanic will insert a scanner to diagnostic port of the vehicle and recover the codes and freeze frame data.
• If he happens to find any additional error codes, he has to address them as well.
• Once it is done, he has to reset the vehicle, and then test drive to see if the error code appears.
• If the error code does not return, then there can be an erratic condition.
• But, if the error code returns, then the mechanic has to check the temperature sensor.
• If the temperature sensor is faulty or if the voltage output is not within expected range, has to be replaced.
• Also, the mechanic can check for any sign of leaks, and quickly fix the issue.
• Then the mechanic has to check the wires, connectors and other electrical components and quickly replace them if he finds them to be damaged or defective.
• If the issues are not yet sorted out, then the mechanic will use a digital voltmeter/ ohmmeter and connect it to the vehicle.
• Once the circuit is inspected, he will thoroughly check all the harness and repair them accordingly.
• Whenever the mechanic or a trained professional, repairs any of the component like wires or connectors, he will reset the code and test drive the vehicle again to see if the error code appears again.
• This can actually help the mechanic to know if the problem is fixed.

Common Mistakes When Diagnosing The P0BC9 Code

• Malfunctioning inverter assembly
• Battery cooling fan circuit damages
• Temperature sensor problematic
• Battery wiring and connector problems
• Failure in the battery energy control module