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DTC codes / P0Cxx · Hybrid propulsion / P0C80

P0C80Hybrid/EV Battery Temperature Sensor G Circuit Intermittent/Erratic

P0C80 indicates that the hybrid or electric vehicle battery temperature sensor designated as 'G' is sending an intermittent or erratic signal to the battery energy control module. The computer has detected that the sensor's voltage or resistance readings are jumping around or dropping out unpredictably, rather than reporting a steady temperature.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaHybrid propulsion

Symptoms you may notice

  • Illumination of the check engine light or hybrid system warning light
  • Often no symptoms besides the warning light, especially if the erratic signal is brief
  • Reduced hybrid system power or forced limp mode in some cases
  • Inaccurate battery temperature display on the dash or energy monitor
  • Possible charging or discharging limitations if the fault affects battery management
  • Intermittent operation of the hybrid system, such as random shutdowns or failure to start

Common causes, most likely first

  1. Loose, corroded, or damaged electrical connector at the temperature sensor G
  2. Chafed, broken, or intermittently shorted wire in the sensor circuit
  3. Faulty temperature sensor G itself, causing erratic resistance changes
  4. Poor terminal tension or pin fit at the battery energy control module connector
  5. Internal fault in the battery energy control module affecting sensor reading
  6. Heat damage or contamination at the sensor due to battery pack overheating
  7. Aftermarket accessories or improper previous repairs disturbing the wiring harness

How to diagnose and fix it

  1. Inspect the sensor G connector and wiring for looseness, corrosion, or physical damage, and clean or secure as needed
  2. Perform a wiggle test on the harness while monitoring sensor G temperature data to reproduce the erratic signal
  3. Measure the resistance of sensor G at the sensor and compare with the manufacturer's temperature-resistance chart
  4. Check continuity and resistance of the signal and ground circuits between the sensor and the battery energy control module
  5. Substitute a known-good sensor or simulate the signal with a resistor box to verify the module's response
  6. If wiring and sensor check out, test the battery energy control module for internal faults or software updates
  7. Clear the code and road test to confirm the repair, ensuring the monitor runs and the code does not return

Erratic signals often hide in the harness

  • A common oversight is replacing the temperature sensor when the real problem is a chafed wire that only shorts when the vehicle flexes over bumps.
  • Intermittent codes like P0C80 can be set by a poor connection at the battery energy control module even if the sensor and wiring appear fine at first glance.
  • The code does not always mean the sensor has failed; it can be triggered by a temporary loss of communication or a voltage spike elsewhere in the hybrid system.
  • Technicians sometimes miss that aftermarket alarms or audio installations can disturb the high-voltage harness routing, leading to intermittent sensor signals.
  • Always check for technical service bulletins (TSBs) for the specific vehicle, as some manufacturers have known issues with connector pin tension or software calibration.

Can I keep driving with P0C80?

You can generally continue driving with this code if the vehicle runs normally, but avoid aggressive driving or heavy electrical loads until it is diagnosed. If the hybrid system warning light is on or you notice reduced power, schedule service soon to prevent battery damage.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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