What Does P0C45 Mean?
The hybrid battery pack coolant temperature sensor is reporting abnormally high temperature readings, above maximum threshold. This indicates an open circuit, high resistance, or actual overheating condition.
Common Causes
35%
Open circuit in sensor wiring or poor connection
30%
Failed temperature sensor reading high or open
20%
Corroded connector causing high resistance
15%
Actual battery pack overheating condition
Diagnostic Steps
1
Step 1: Verify actual battery pack temperature using scan tool data and touch test to rule out genuine overheating
2
Step 2: Check sensor signal voltage at control module (voltage near reference indicates open circuit)
3
Step 3: Disconnect sensor and measure resistance; compare to specification for ambient temperature
4
Step 4: Inspect connector for corrosion, bent pins, or poor terminal contact causing high resistance
5
Step 5: Verify battery cooling system operation including pump function and coolant flow if actual overheating suspected
Estimated Repair Cost
$200 - $900
Parts + labor, varies by vehicle and location
The hybrid battery pack coolant temperature sensor is reporting abnormally high temperature readings, above maximum threshold. This indicates an open circuit, high resistance, or actual overheating condition.
The most common cause of P0C45 (Hybrid Battery Pack Coolant Temperature Sensor Circuit High) is: Open circuit in sensor wiring or poor connection
Typical repair costs for P0C45 range from $200 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
If false reading, unnecessary power reduction may occur. If actual overheating, immediate attention required to prevent battery pack damage and potential safety hazard.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0C45 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Hybrid Battery Thermal Management
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
