What Does P0C49 Mean?
The control module detects abnormally high voltage in the hybrid battery coolant pump control circuit. This suggests a short to power, open circuit with voltage feedback, or faulty control module driver.
Safety Warning
Pump may run continuously or not at all, preventing proper thermal management of battery. Vehicle will limit power to protect battery from thermal damage, potentially causing unexpected power loss.
Common Causes
40%
Short to battery voltage in pump control wiring
25%
Failed control module with shorted output driver
20%
Damaged pump connector causing terminal cross-contact
10%
Failed coolant pump with internal short to power
5%
Incorrect wiring repair or modification causing short
Diagnostic Steps
1
Step 1: Disconnect coolant pump connector and check for voltage on control circuit wire (should be none with key on, pump off)
2
Step 2: Inspect pump connector for damaged terminals, corrosion, or cross-contamination
3
Step 3: Check wiring harness for damage, chafing against sharp edges, or improper routing near power wires
4
Step 4: Test control module output with pump disconnected using scan tool commands
5
Step 5: If wiring is intact and voltage persists, test pump motor for internal shorts to power
Estimated Repair Cost
$200 - $1,200
Parts + labor, varies by vehicle and location
The control module detects abnormally high voltage in the hybrid battery coolant pump control circuit. This suggests a short to power, open circuit with voltage feedback, or faulty control module driver.
The most common cause of P0C49 (Hybrid Battery Pack Coolant Pump Control Circuit High) is: Short to battery voltage in pump control wiring
Typical repair costs for P0C49 range from $200 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Pump may run continuously or not at all, preventing proper thermal management of battery. Vehicle will limit power to protect battery from thermal damage, potentially causing unexpected power loss.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0C49 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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