What it means
The hybrid battery power-off control circuit reports a generic fault. Safe disconnection of the HV system cannot be commanded reliably.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
The hybrid or electric vehicle's battery power-off circuit helps command safe disconnection of the high-voltage battery. The control system monitors whether that command path and associated contactor operation work as expected; this code sets when the power-off circuit reports a general fault.
Common causes
Most likely first.
- Power-off wiring fault
- Main contactor fault
- Pack cell imbalance approaching service threshold
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 all high-voltage battery and contactor related codes and freeze-frame data to identify whether the power-off fault appears with a communication or pack condition.
- Check 12-volt supply and accessible low-voltage power-off circuit wiring and connectors for damage, corrosion, or poor seating.
- Use a hybrid-capable scan tool to review contactor and power-off command status without attempting to access high-voltage components.
- Have the specified diagnostic procedure used to distinguish a power-off wiring issue from a contactor or battery pack condition.
- If low-voltage wiring checks pass, follow the manufacturer's high-voltage safety and test procedures to evaluate the contactor and pack status.
Common fixes
- Repair damaged or poorly connected low-voltage power-off circuit wiring.
- Correct a weak 12-volt supply or faulty control circuit connection.
- Repair or replace a contactor if testing confirms it is not responding correctly.
- Address a battery pack imbalance or related pack fault if indicated by the manufacturer's diagnosis.
Can I keep driving?
A fault in the battery power-off circuit can prevent reliable high-voltage isolation, so do not attempt high-voltage service or ignore the warning. If power is reduced or charging fails, limit use and arrange prompt diagnosis by a hybrid-qualified technician.
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.