Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with the electrical power going to the pump that helps cool the battery in a hybrid or electric car. It's like when a toy doesn't work because the batteries are too strong or not connected right.
The P0C4D code indicates that the voltage in the circuit supplying power to the battery pack coolant pump A is higher than expected.
The P0C4D code is triggered when the powertrain control module (PCM) detects a voltage level in the supply circuit of the hybrid/EV battery pack coolant pump A that is higher than the specified range. This could be due to an issue with the wiring, connectors, or the pump itself.
• Check Engine Light is on
• Overheating of the hybrid/EV battery pack
• Reduced vehicle performance
• Faulty battery pack coolant pump
• Wiring issues such as shorts or open circuits
• Defective PCM or control module
PCM: Powertrain Control Module
OBD-II: On-Board Diagnostics, Second Generation
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the battery pack coolant pump for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the faulty battery pack coolant pump.
• Reprogram or replace the PCM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$200 - $800
Moderate
• Toyota Prius
• Chevrolet Volt
• Nissan Leaf
• Regular maintenance checks on the cooling system.
• Ensure proper coolant levels.
• Inspect electrical connections periodically.
Electrical Circuit Issue
• Avoid driving the vehicle until the issue is resolved to prevent battery damage.
• Consult a professional mechanic for accurate diagnosis and repair.
Check with your vehicle manufacturer as hybrid/EV components may have extended warranties.
This code has been more common as hybrid and EV vehicles age and their components wear out.
High – This issue can lead to battery overheating and potential damage if not addressed promptly.
Operating a vehicle with this code may lead to battery damage and void warranties. Always address promptly.
• Vehicle in ready mode
• Battery temperature within normal operating range
The battery pack coolant pump is typically located near the hybrid/EV battery pack, often in the rear of the vehicle.
Q: Can I drive my car with the P0C4D code?
A: It's not recommended to drive with this code active as it can lead to battery overheating.
Q: What happens if I ignore this code?
A: Ignoring this code can result in battery damage and reduced vehicle performance.
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