What it means
The code indicates deterioration in hybrid/EV battery pack subsection G. The specific degradation measure and threshold depend on the vehicle.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
A hybrid or electric vehicle battery pack is divided into monitored subsections, and subsection G is one of the areas the battery-management system evaluates. P2CCC indicates that its deterioration measure has crossed the vehicle's threshold; the specific measure and threshold vary by model.
Common causes
Most likely first.
- Cell aging
- Repeated exposure to high or low temperatures
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 scan tool that can read hybrid or EV battery data to review freeze-frame information and the manufacturer's deterioration values for subsection G.
- Compare subsection G's voltage, temperature, and deterioration data with the other monitored subsections under the same operating conditions.
- Check for related battery, cooling, charging, or isolation codes that could explain an abnormal reading in subsection G.
- Inspect accessible battery cooling ducts, filters, and connectors only as allowed by the manufacturer's safety procedures; do not open the high-voltage pack.
- Follow the manufacturer's battery diagnostic procedure to confirm whether subsection G is degraded or whether a cooling, sensing, or charging fault is affecting its reading.
Common fixes
- Clear debris from battery cooling air paths or service a restricted filter if the manufacturer's procedure identifies airflow as a problem.
- Repair a confirmed battery temperature-sensing, cooling, or charging fault affecting subsection G.
- Replace or service the affected battery module or pack only when manufacturer-approved diagnostics confirm deterioration in subsection G.
- Update or repair battery-management components only if vehicle-specific diagnosis identifies them as the cause.
Can I keep driving?
Avoid hard acceleration and long trips if power is reduced, charging is restricted, or a hybrid/EV warning is present; the vehicle may enter limp mode or lose electric range. Arrange prompt diagnosis, and do not access the high-voltage battery pack 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.