What it means
The ECM detects a circuit range/performance 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 measures the temperature of a monitored area of the hybrid or EV battery pack. The control module checks whether its signal behaves as expected for operating conditions; this code sets when the sensor D circuit is electrically present but its reading falls outside the expected range or response.
Common causes
Most likely first.
- Sensor characteristic drifted
- Sensor mounting displaced
- Sensor element aged beyond calibration window
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 temperature readings to see the conditions under which sensor D became implausible.
- Compare sensor D with nearby battery temperature sensors during a cold start and as the pack warms to spot an outlier or a reading that changes too slowly.
- Power down the vehicle as specified by the manufacturer, then inspect sensor D's mounting, connector, and wiring for displacement, damage, or poor contact.
- Check the sensor D signal and circuit continuity against the manufacturer's wiring information to distinguish a circuit fault from a drifting sensor.
- Test sensor D's response and mounting against the manufacturer's specification, and check for related battery pack faults.
Common fixes
- Secure sensor D in its specified position.
- Clean or repair a poor sensor D connector or damaged wiring.
- Replace sensor D if its response is outside the manufacturer's specification.
- Repair any confirmed battery pack fault affecting the sensor's readings.
Can I keep driving?
Drive gently only if the vehicle remains stable and gives no stop or battery warning; avoid heavy acceleration and charging if either is restricted. A misleading temperature reading can cause reduced power or charging and may lead to a 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.