What it means
The hybrid/EV battery system discharge time is shorter than the calibrated limit. The code indicates an abnormal discharge-time result; its cause depends on the vehicle.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
During a controlled HV battery discharge check, the battery control system monitors how quickly the relevant electrical voltage falls. This code sets when discharge occurs faster than the calibrated limit, which can point to an abnormal DC-link or charge-resistor path or a battery condition requiring further evaluation.
Common causes
Most likely first.
- Short on DC-link
- Charge resistor shorted
- 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
- Use a hybrid-capable scan tool to record freeze-frame data, related HV battery codes, and the conditions under which the short discharge time was detected.
- Check live battery and DC-link data for imbalance or abnormal changes, following the manufacturer's diagnostic routine rather than inferring pack condition from one reading.
- Inspect accessible low-voltage connectors and wiring associated with the battery control and precharge system for damage or poor connections.
- Have the HV isolation and DC-link circuit checked for an unintended short using the manufacturer's safety and test procedure.
- If the external circuits pass, have the charge resistor and battery cell balance evaluated with the specified HV diagnostic equipment.
Common fixes
- Repair a damaged low-voltage connector or harness found in the related control circuit.
- Repair a confirmed DC-link short using the manufacturer's HV procedures.
- Replace a charge resistor that fails its specified test.
- Address a confirmed battery cell imbalance through the manufacturer's battery service procedure.
Can I keep driving?
Avoid driving or charging if the vehicle shows reduced power, charging failure, or an HV system warning, since the fault may reflect an abnormal high-voltage discharge path. Arrange prompt diagnosis; do not open or probe HV 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.