What Does P0C80 Mean?
DTC P0C80 indicates that the hybrid battery temperature sensor G circuit is exhibiting intermittent or erratic behavior. The signal is fluctuating unpredictably, dropping in and out of valid range, or showing sudden jumps that are not consistent with normal thermal changes. This pattern typically points to a loose connection, damaged wiring, or a sensor that is failing intermittently.
Common Causes
30%
Loose or backed-out terminal pins in the sensor G connector
25%
Intermittent break in the sensor G wiring harness (chafed wire, cold solder joint)
20%
Corroded connector causing intermittent contact resistance changes
15%
NTC thermistor with intermittent internal failure
10%
Electromagnetic interference affecting the sensor G signal path
Diagnostic Steps
1
Monitor the sensor G temperature reading in real time with the scan tool while performing a wiggle test on the connector and wiring harness.
2
Inspect the sensor G connector for backed-out pins, spread terminals, or intermittent corrosion buildup.
3
Check the wiring harness routing for areas where chafing, pinching, or flexing could cause intermittent breaks.
4
Measure the thermistor resistance while physically manipulating the sensor to detect intermittent internal faults.
5
Inspect the sensor G wiring routing relative to high-current cables or inverter power lines that could introduce electromagnetic interference.
6
If the fault cannot be reproduced, clean and re-seat all connections, apply dielectric grease, and monitor for recurrence.
Estimated Repair Cost
$100 - $700
Parts + labor, varies by vehicle and location
DTC P0C80 indicates that the hybrid battery temperature sensor G circuit is exhibiting intermittent or erratic behavior. The signal is fluctuating unpredictably, dropping in and out of valid range, or showing sudden jumps that are not consistent with normal thermal changes. This pattern typically po...
The most common cause of P0C80 (Hybrid Battery Temperature Sensor "G" Circuit Intermittent/Erratic) is: Loose or backed-out terminal pins in the sensor G connector
Typical repair costs for P0C80 range from $100 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
An intermittent temperature sensor can cause erratic BMS behavior, alternating between normal operation and fault-mode responses. The inconsistent data may lead to improper thermal management decisions during the periods when the sensor is malfunctioning.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0C80 to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid Battery Thermal Management
Difficulty
Type
Generic (SAE)
Recommended Tools
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