What it means
The HV battery temperature sensor H reports a circuit low fault. Cell-group temperature monitoring impaired on this channel.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
HV battery temperature sensor H reports the temperature of its assigned cell group to the battery management system. P0C83 sets when the sensor H signal is abnormally low electrically, which can result from a signal short to ground, a shorted sensor, or a poor connector contact.
Common causes
Most likely first.
- Signal wire shorted to ground
- Internal sensor short
- Connector pins corroded - high contact resistance
Symptoms
- EV/hybrid system warning light on
- Reduced power output or limp mode
- Charging may fail or be slowed
- Reduced electric range
How to diagnose it
- Use a hybrid-capable scan tool to capture freeze-frame data and check sensor H's reported temperature and circuit status against nearby battery sensors.
- Inspect sensor H's connector and accessible wiring for corrosion, damaged insulation, pin displacement, or a signal wire contacting ground.
- With the high-voltage system isolated using the manufacturer's procedure, check connector pin condition and continuity in the sensor H circuit.
- Test the sensor H signal for an unintended short to ground using the manufacturer's wiring diagram and diagnostic procedure.
- If the wiring is not shorted, test sensor H against the manufacturer's specification to determine whether the sensor itself is internally shorted.
Common fixes
- Clean and secure corroded or loose sensor H connector pins.
- Repair a signal wire shorted to ground or other damaged sensor H wiring.
- Replace sensor H if it fails the specified circuit or sensor test.
- Clear the code and confirm sensor H data is plausible after the repair.
Can I keep driving?
Limit driving and avoid charging if the hybrid warning or reduced-power mode is present; the battery controller may restrict operation because it cannot trust sensor H's temperature signal. Stop if the vehicle loses substantial power or shows a battery-temperature warning.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.