What it means
The HV battery temperature sensor G 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
Temperature sensor G measures a cell-group area inside the high-voltage battery, and its signal circuit lets the battery control system monitor that temperature. P0C7E sets when the sensor G circuit voltage is lower than the module expects, commonly because the signal is shorted to ground, the sensor is internally shorted, or a connector has a poor 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
- Read freeze-frame data and battery-system codes to confirm the sensor G circuit-low fault and check whether other temperature channels are affected.
- Compare live sensor G temperature with nearby channels to see whether the reading is implausibly low or fixed.
- With high-voltage safety procedures followed and the pack unopened, inspect accessible sensor G wiring and connector pins for a ground short, corrosion, or damage.
- Test the sensor G signal circuit for shorts and check the sensor and connector using the manufacturer’s procedure.
- Compare circuit measurements with the manufacturer’s specification before replacing the sensor or control module.
Common fixes
- Clean and secure a corroded or poorly seated sensor G connector if service information permits.
- Repair a sensor G signal wire shorted to ground.
- Replace sensor G if testing confirms an internal short.
- Repair the affected circuit connection if testing identifies excessive contact resistance.
Can I keep driving?
Arrange prompt service and avoid charging or driving if power is limited or a battery warning appears; the system may restrict operation because sensor G temperature cannot be trusted. Do not probe or open high-voltage battery components yourself.
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.