What it means
The hybrid/EV battery system discharge time is longer 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 an HV battery discharge check, the control system measures how long the relevant voltage takes to fall. This code sets when discharge takes longer than the calibrated limit, which can indicate excess resistance in the path, weak contactor operation, or a battery condition that needs evaluation.
Common causes
Most likely first.
- Increased resistance in path
- Contactor coil weakening
- 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
- Save freeze-frame data and related HV codes with a hybrid-capable scan tool, noting when the long discharge time occurred.
- Review available live battery and DC-link data for abnormal voltage behavior or cell imbalance using the manufacturer's diagnostic routine.
- Inspect accessible low-voltage wiring and connectors associated with the HV battery control and contactor circuits for damage or poor connections.
- Have the discharge path and contactor operation tested for excess resistance using the manufacturer's HV safety procedure.
- If the path checks pass, have pack cell balance assessed with the specified diagnostic equipment.
Common fixes
- Repair a poor low-voltage connector or damaged control-circuit wiring.
- Repair a confirmed high-resistance connection in the discharge path using the manufacturer's HV procedures.
- Replace a contactor that fails the specified operation test.
- Address confirmed cell imbalance using the manufacturer's battery service procedure.
Can I keep driving?
Limit driving and charging if the vehicle warns of an HV fault, reduced power, or charging trouble; the discharge behavior can indicate a contactor or high-voltage path problem. Do not access the battery or contactors yourself, and stop safely if power becomes unreliable.
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.