BMW DTC P0C4B – Hybrid/EV Battery Pack Coolant Pump Supply Voltage Circuit/Open
DTC P0C4B meaning on BMW
DTC P0C4B on a BMW indicates a fault in the Hybrid/EV Battery Pack Coolant Pump Supply Voltage Circuit. This fault code is specific to the hybrid or electric vehicles that have a battery pack coolant system with an electric pump.
BMW DTC P0C4B symptoms
Symptoms of DTC P0C4B on a BMW may include:
- Check Engine Light (MIL) illuminated
- Hybrid/EV system warning light on
- Reduced hybrid/EV system performance
- Overheating of the battery pack
BMW DTC P0C4B causes
Common causes of DTC P0C4B on a BMW include:
- Faulty battery pack coolant pump
- Open or short circuit in the supply voltage wiring
- Faulty hybrid/EV battery pack coolant pump control module
BMW DTC P0C4B seriousness
The seriousness of DTC P0C4B on a BMW lies in the potential risk of overheating the battery pack, which can lead to further damage to the hybrid or electric vehicle components. It is important to address this fault code promptly to prevent any potential safety hazards.
How to diagnose DTC P0C4B on BMW
To diagnose DTC P0C4B on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and freeze frame data
- Inspect the battery pack coolant pump and its wiring for any visible damage
- Check the voltage supply to the coolant pump using a multimeter
- Test the hybrid/EV battery pack coolant pump control module for proper operation
How to fix DTC P0C4B on BMW
To fix DTC P0C4B on a BMW, the following steps may be taken:
- Replace the faulty battery pack coolant pump if necessary
- Repair any open or short circuits in the supply voltage wiring
- Replace the defective hybrid/EV battery pack coolant pump control module
- Clear the fault code and perform a test drive to ensure the issue is resolved
How to erase DTC P0C4B on BMW
To erase DTC P0C4B on a BMW, the fault code can be cleared using a diagnostic scanner. After the repair has been completed, the mechanic can reset the fault code, and the Check Engine Light should turn off if the issue has been successfully resolved.
Recommended tools & DTC Scanners for BMW
Best Diagnostic App for modern BMWs: BimmerLink
Recommended Bluetooth adapter for Bimmerlink: OBDLink CX
Cable adapter for Bimmerlink: Enet Cable USB Type C
For older BMWs we recommend: Autel AutoLink AL319 (2024 version)
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
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