What Does P0C4C Mean?
The voltage in the hybrid battery coolant pump power supply circuit is below the acceptable threshold. This indicates insufficient voltage reaching the pump due to resistance, poor connections, or inadequate power supply.
Safety Warning
Low voltage causes reduced pump speed and inadequate coolant flow, leading to battery overheating. Vehicle will reduce power output to protect battery, potentially causing unexpected performance loss.
Common Causes
35%
High resistance in power supply connections or terminals
30%
Corroded or loose connections in pump power circuit
20%
Undersized or damaged power supply wiring causing voltage drop
10%
Weak or failing relay with high contact resistance
5%
Low system voltage from failing 12V battery or charging system
Diagnostic Steps
1
Step 1: Measure voltage at pump power terminal with pump running (should be within 1V of battery voltage)
2
Step 2: Perform voltage drop test across all connections in power supply circuit
3
Step 3: Check 12V battery condition and charging system output voltage
4
Step 4: Inspect and clean all power supply connections, terminals, and relay contacts
5
Step 5: Check power wire gauge and condition for damage or corrosion causing excessive resistance
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
The voltage in the hybrid battery coolant pump power supply circuit is below the acceptable threshold. This indicates insufficient voltage reaching the pump due to resistance, poor connections, or inadequate power supply.
The most common cause of P0C4C (Hybrid Battery Pack Coolant Pump Supply Voltage Circuit Low) is: High resistance in power supply connections or terminals
Typical repair costs for P0C4C range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Low voltage causes reduced pump speed and inadequate coolant flow, leading to battery overheating. Vehicle will reduce power output to protect battery, potentially causing unexpected performance loss.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0C4C to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid Battery Cooling System
Difficulty
Type
Generic (SAE)
Recommended Tools
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