P0C4B
Hybrid/EV Battery Pack Coolant Pump A Supply Voltage Circuit/Open
P0C4B is an OBD-II diagnostic trouble code meaning: Hybrid/EV Battery Pack Coolant Pump A Supply Voltage Circuit/Open. Common causes: open or short circuit in the pump power supply circuit, faulty pump relay or fuse. Estimated repair cost: $56–278.
Symptoms
- Check Engine light comes on
- Hybrid system power reduction
- Battery overheating
- Noise or lack of operation of the cooling pump
- The vehicle goes into emergency mode
Causes
- Open or short circuit in the pump power supply circuit
- Faulty pump relay or fuse
- Problems with the wiring harness or connectors
- Failure of the cooling pump itself
- Malfunction of the hybrid system control module
How to Fix
- Check the coolant pump fuse and relay
- Inspect the wiring harness and connectors for damage
- Check the voltage at the pump terminals
- Test or replace the cooling pump
- Check the operation of the hybrid system control module
Related codes
Error P0C4B by Vehicle Brand
FAQ
What does the P0C4B code mean?
P0C4B is an OBD-II diagnostic trouble code that indicates: Hybrid/EV Battery Pack Coolant Pump A Supply Voltage Circuit/Open
What causes a P0C4B error code?
The most common causes of P0C4B include: Open or short circuit in the pump power supply circuit; Faulty pump relay or fuse; Problems with the wiring harness or connectors; Failure of the cooling pump itself.
How do I fix a P0C4B diagnostic trouble code?
To fix P0C4B: Check the coolant pump fuse and relay. Inspect the wiring harness and connectors for damage. Check the voltage at the pump terminals. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0C4B?
Limited driving only, diagnose soon
How much does it cost to fix P0C4B?
The estimated repair cost for P0C4B is $56–278. Actual cost depends on your vehicle, location, and labor rates.
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