What it means
The BMS detects a circuit fault on voltage sense channel V of the high-voltage battery. Cell-group voltage measurement is unreliable on this channel.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
The BMS uses voltage sense channel V to monitor a cell group in the hybrid battery pack. This code reports a general circuit fault on channel V, so the group voltage measurement cannot be trusted; wiring, the sensing path, or an unusually imbalanced group may need investigation.
Common causes
Most likely first.
- Sense circuit failed
- Wiring 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
- Save freeze-frame data and compare channel V's reported voltage with neighboring cell-group readings to look for a missing or unusually different value.
- With the vehicle powered down under the manufacturer's high-voltage safety procedure, inspect the channel V sense wiring and accessible connector for damage, looseness, or corrosion.
- Check channel V connector pin fit and condition, since a poor connection can interrupt the measurement.
- Have a qualified hybrid technician test channel V wiring and the sensing path for opens or shorts using the manufacturer's procedure.
- If the circuit passes, review pack cell-group balance and test the battery monitoring module's channel V input against the manufacturer's specification.
Common fixes
- Reseat a loose channel V connector.
- Clean or repair corroded channel V connector pins.
- Repair or replace channel V sense wiring found open, shorted, or damaged.
- Service an out-of-balance cell group or replace the battery monitoring module only when the manufacturer's tests confirm the cause.
Can I keep driving?
Drive only as needed if the vehicle remains controllable, and avoid hard acceleration because the system may reduce power or enter limp mode; charging can also be limited. Stop if a battery safety warning appears and arrange prompt hybrid-system diagnosis.
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.