What Does P0C42 Mean?
The hybrid battery pack coolant temperature sensor circuit has a malfunction preventing proper signal transmission. This affects monitoring of the battery thermal management system.
Common Causes
35%
Open or shorted wiring in coolant temperature sensor circuit
30%
Failed hybrid battery coolant temperature sensor
25%
Damaged or corroded sensor connector
10%
PCM or battery control module circuit fault
Diagnostic Steps
1
Step 1: Locate and inspect hybrid battery coolant temperature sensor connector for damage or corrosion
2
Step 2: Measure reference voltage at sensor connector with key on (typically 5V)
3
Step 3: Check continuity of sensor signal and ground wires between sensor and control module
4
Step 4: Test sensor resistance at ambient temperature and compare to specifications
5
Step 5: Check for shorts to power or ground in sensor circuit wiring
Estimated Repair Cost
$200 - $700
Parts + labor, varies by vehicle and location
The hybrid battery pack coolant temperature sensor circuit has a malfunction preventing proper signal transmission. This affects monitoring of the battery thermal management system.
The most common cause of P0C42 (Hybrid Battery Pack Coolant Temperature Sensor Circuit) is: Open or shorted wiring in coolant temperature sensor circuit
Typical repair costs for P0C42 range from $200 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Loss of battery temperature monitoring may result in reduced power output or battery damage. Vehicle may limit performance to protect battery.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0C42 to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid Battery Thermal Management
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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