What it means
The ECM detects a circuit intermittent/erratic fault on the hybrid/ev battery temperature sensor d circuit. Reading cannot be used reliably for control.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Battery temperature sensor D reports the temperature of a monitored area of the hybrid or EV battery pack. The control module watches for a stable signal; this code sets when sensor D's reading drops out or changes erratically, often because of an intermittent connector or ground connection.
Common causes
Most likely first.
- Sensor connector not seated
- Noisy ground reference
- Connector with intermittent contact under vibration
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
- Review freeze-frame and fault history data, then watch sensor D's live reading for dropouts while comparing it with other battery temperature sensors.
- With the vehicle powered down as specified by the manufacturer, inspect and reseat sensor D's connector, checking for loose pins, corrosion, moisture, or harness strain.
- Inspect sensor D wiring and ground reference for damage or poor connections using the manufacturer's wiring information.
- Use the manufacturer's approved method to check whether gentle harness movement causes sensor D's signal to change or drop out.
- Test the sensor and circuit for stable operation against the manufacturer's specification, and inspect for related battery pack faults.
Common fixes
- Reseat and secure the sensor D connector.
- Repair loose, corroded, or damaged connector terminals and wiring.
- Repair a poor ground reference affecting sensor D.
- Replace sensor D if the signal remains erratic with a sound circuit.
Can I keep driving?
If the warning or power limitation comes and goes, avoid hard acceleration and charging until the fault is resolved. A dropout can cause sudden power reduction or a shutdown, so stop safely if propulsion 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.