What it means
The BMS detects a circuit intermittent/erratic 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 tracks cell-group voltage on channel D and expects its signal to remain stable as operating conditions change. This code sets when the channel D signal becomes erratic or drops in and out, so the BMS cannot consistently trust that measurement.
Common causes
Most likely first.
- Loose or corroded connector
- Damaged wiring with an intermittent connection
- 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
- Check freeze-frame and fault history, then watch channel D live data alongside adjacent groups to see whether its reading jumps or disappears.
- Inspect the accessible channel D harness and connectors, especially for chafing, moisture, corrosion, or a connector that is not fully seated.
- With the vehicle safely shut down as specified by the manufacturer, check channel D connector retention and wiring for an intermittent open.
- Have a qualified technician perform the manufacturer's harness movement or continuity checks on channel D while monitoring the signal for dropouts.
- If the circuit remains stable through testing, compare the sensing module's channel D input with scan data to check for an internal module fault.
Common fixes
- Reseat and clean a loose or corroded channel D connector.
- Repair chafed or damaged channel D wiring causing intermittent contact.
- Replace terminals or connector components that cannot maintain a secure connection.
- Repair or replace the sensing module if channel D continues to drop out with verified wiring.
Can I keep driving?
Drive only as needed to reach a safe place or repair facility, and avoid trips that depend on consistent hybrid or EV power; the fault may trigger reduced power or limp mode without warning. Intermittent readings can also disrupt charging or reduce electric range.
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.