What it means
The ECM detects a circuit high 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 monitors the temperature of one area of the hybrid or EV battery pack. The control module sets this code when the sensor D signal is electrically high, which can result from a short to voltage, an open sensor, or poor connector contact; it does not by itself mean the battery is overheating.
Common causes
Most likely first.
- Signal wire shorted to B+
- Open sensor
- Connector pins corroded - high contact resistance
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 data and live battery temperatures to confirm sensor D is the outlier and note whether its signal appears stuck high.
- Compare sensor D's reading with the other battery temperature sensors to check whether the fault is limited to this circuit.
- With the vehicle powered down as specified by the manufacturer, inspect sensor D's harness and connector for a signal wire contacting a power source, an open connection, corrosion, or loose pins.
- Test the sensor D circuit for an open or short to voltage using the manufacturer's wiring information.
- Test sensor D and connector contact against the manufacturer's specification to identify an open sensor or high-resistance connection.
Common fixes
- Reseat the sensor D connector and secure the harness.
- Repair a signal wire shorted to voltage or an open in the circuit.
- Clean or replace corroded or damaged connector terminals.
- Replace sensor D if it is open or fails the manufacturer's test.
Can I keep driving?
Avoid hard acceleration and charging if the vehicle restricts them, and stop safely if it warns of a battery fault or loses propulsion. An unreliable sensor D reading can prompt reduced power, restricted charging, or shutdown.
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.