What it means
The monitored voltage for hybrid/EV battery D is higher than the control module’s expected range.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
The battery control system monitors the voltage of hybrid/EV battery D, one section of the high-voltage pack. This code sets when the reported voltage for that section is above the expected range, potentially due to charging overvoltage, a sense circuit reading high, or an imbalanced cell group.
Common causes
Most likely first.
- Charging system overvoltage
- Sense circuit drifted high
- 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
- Record freeze-frame data and compare battery D voltage with other monitored sections and the charging state to establish when the high reading appears.
- With the vehicle powered down, visually check accessible battery D sense wiring and connectors for looseness, damage, or corrosion; do not open the high-voltage pack.
- Graph battery D voltage on a scan tool during the operating conditions in the freeze frame and note whether it remains high or varies with charging.
- Test the battery D voltage-sense circuit for drift, poor contact, and continuity using the manufacturer's procedure.
- If the sense circuit is sound, have a qualified hybrid technician check pack balance and charging-system voltage.
Common fixes
- Repair a loose, damaged, or corroded battery D sense-circuit connector or harness.
- Repair a confirmed high-biased battery D voltage-sense circuit.
- Correct a charging-system overvoltage condition.
- Service or replace affected battery modules if testing confirms imbalance.
Can I keep driving?
Avoid hard acceleration and long trips if power is limited, charging is restricted, or limp mode is active; hybrid operation may be reduced or disabled. Arrange prompt diagnosis and do not touch high-voltage components.
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.