What it means
The BMS detects a circuit high fault on voltage sense channel D 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 measures cell-group voltage through separate sense channels, and channel D has its own signal path. This code sets when channel D reads above the expected circuit range, making that cell-group voltage measurement unreliable.
Common causes
Most likely first.
- Sense wire shorted to voltage
- Open or high-resistance connection in the sense circuit
- Fault in the battery voltage-sensing module
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 review channel D live data beside neighboring cell-group readings to see whether the high signal is constant or occurs under particular conditions.
- With the vehicle shut down according to the manufacturer's procedure, inspect channel D wiring for damage or contact with a voltage source.
- Check channel D connector pins for corrosion, looseness, or displacement that could interrupt the signal and make it appear high.
- Have a qualified technician isolate the high-voltage battery and test channel D for a short to voltage and for continuity using the manufacturer's procedure.
- If the harness tests correctly, check whether the sensing module's channel D input agrees with scan data before considering module repair or replacement.
Common fixes
- Repair channel D wiring that is shorted to a voltage source.
- Secure or repair channel D connector pins that are loose, corroded, or displaced.
- Repair an open or high-resistance section of the channel D sense circuit.
- Repair or replace the voltage-sensing module if its channel D input remains faulty after circuit checks.
Can I keep driving?
Limit driving and avoid depending on electric power or charging until the high channel D reading is diagnosed; the vehicle may reduce power or enter limp mode. An unreliable battery measurement can prompt further operating restrictions.
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.