Error Code P0C4B: What It Means & What To Do?

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Is your car engine stalling and not starting? Is there a lack of response from the hybrid motor along with sudden downfall in acceleration? All these can be an indication towards some fault in the hybrid battery pack of the vehicle thus storing OBD code P0C4B in the PCM.

OBD Code P0C4B means Hybrid Battery Pack Coolant Pump Supply Voltage Circuit/Open Issue.

The hybrid battery coolant pump manages the temperature of the battery and thus keeps it operational under optimal temperatures. When the temperature sensor notices any out of specification reading, it informs the PCM which thus will store the code and can even make the vehicle go into limp mode.

What causes this problem with the Hybrid Battery Pack Coolant Pump Supply Voltage Circuit/Open?

• Faulty hybrid battery coolant pump
• Hybrid coolant pump harness and connector issue
• Coolant pump circuit and wiring problems
• PCM issue

1. Powertrain Control Module - Faulty PCM can flash and store wrong OBD error. It’s better to get the faulty electricals replaced as soon as possible.
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3. Coolant Hoses/Pipes - Check for damaged hoses and thus repair or replace as needed.
4. Coolant/Antifreeze - Keep the antifreeze levels optimal for proper functioning of the intercoolers. Buy now!
5. Cooling System - Check for any faulty cooling system parts and replace as needed to check for the proper functioning. Explore now!
6. Battery Coolant Pump - If the coolant pump is problematic, it can hamper the battery and motor and thus the performance. Replace it to avoid much more expensive repairs.

Interested in knowing the symptoms to old code P0C4B? If yes, then you have arrived at the right place. We at Parts Avatar have listed out few common symptoms associated with Hybrid Battery Pack Coolant Pump Supply Voltage Circuit/Open

Common Symptoms

• Check Engine Light illumination
• Inefficient hybrid motor performance and response
• Limp mode on to protect the engine from further damage

We have listed out some ways which would help you to correct the occurrence of OBD Code P0C4B. They are mentioned here as follows:

• Replacement of hybrid battery coolant pump
• Replacement of hybrid battery
• Replacement of faulty wiring and connectors
• PCM replacement

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Look for loose connections, damaged wiring, etc., by visually inspecting the coolant pump, temperature sensor and the wiring. Also check for damages to the charge air cooler and ducting, repair if needed, clear the code and see if it returns.

• Find the hybrid battery coolant pump and find the coolant lines/ pipes in order to trace back to the coolant pump.
• Given the temperatures that the coolant system is exposed to, it would be wise to inspect the harness around the area thoroughly for signs of melting harness or things of that nature.
• Check your coolant levels and also the health of the coolant. Make sure it is clean and full before proceeding.
• Measure the coolant pump control circuit and test the control circuit. This may involve disconnecting the connector at the ECM (Engine Control Module) and the other end at the coolant pump. Refer to your wiring diagram for specific wiring colours and test procedures.
• Test the coolant pump depending on your particular system. After all, they are just electric pumps. Equipped with a 12-volt source and a good ground, remove the coolant pump from the vehicle, and power it up to see if it fires up at all. If so, you may want to make sure it can transfer fluid as well
• ECM diagnosing is always a last resort which usually involves doing a pin out test at the ECM itself and compare your recordings to desired values.

Common Mistakes When Diagnosing OBD Code P0C4B

Always take assistance of a qualified technician to know the problem to this error. Never lose sight of the symptoms and never be in hurry to come to a conclusion as sometimes very small issue can lead to flashing of the OBD errors. Some of the major mistakes related to code P0C4B are mentioned below.

• High voltage powertrain control module failure
• Leak in the high voltage cooling system
• Low coolant in the high voltage system
• Water pump failure