Hybrid Battery Temperature Sensor D malfunction
What it means
The hybrid control system reports a problem in the circuit of battery temperature sensor D, one of several sensors that track heat inside the high-voltage battery pack. The stored name does not say whether the signal is low, high or erratic. Without a good temperature reading, the module may limit battery use or run the cooling fan harder.
Can I keep driving? Use caution: the car may limit power or shut down to protect the battery, so get it checked soon rather than driving on for long.
What this part does
These sensors measure temperature at points inside the high-voltage battery pack. The battery control system uses the readings to run cooling or heating and to limit power or charging if the cells are too hot or too cold. The battery is part of a high-voltage system, so work on it is for trained people. A fault may result in a warning, reduced power, slower charging or louder cooling operation.
Common symptoms
What you'll notice
- Hybrid or check-engine warning light on
- Battery cooling fan running louder or constantly
- Reduced power or limited battery use
- Poor fuel economy
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Common causes
Most likely first
- Wiring or connector fault in the sensor circuit
- Faulty temperature sensor
- Blocked battery cooling air path, if the reading is truly high
- Battery control module fault
Repair
Likely repair
- Parts often involved: high-voltage battery control unit or sensor, wiring or connector
- Labor: 1–5 h
- Difficulty: Hard
- DIY: Garage only
How to diagnose & fix
Work through it in order
- Read all hybrid and battery codes and note which temperature sensors are listed.
- Check the 12-volt battery and the battery cooling fan inlet and ducts for blockage.
- Inspect the connector and wiring for the temperature sensor circuit for corrosion or damage.
- Compare live temperature readings across the pack sensors with the car cold; they should be close to each other and to outside air.
- Do not open the battery pack or touch orange high-voltage cables; leave any high-voltage testing to a trained technician.
Related codes
About this page
Scan figures come only from diagnostic scans recorded through our own apps and tools. Cars are usually scanned because a symptom or warning light prompted it, so these figures describe our scan records, not how often a fault occurs in any make or model.
Notes about specific manufacturers summarise public records (NHTSA owner complaints, recalls and manufacturer service bulletins), cited under each note. They report what those records say, not our measurements, and they do not suggest that any manufacturer or vehicle is better or worse than another.
Repair time and cost estimates come from a public repair dataset and are typical ranges, not quotes.
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This page is general information, not professional advice. Have safety-critical faults (brakes, steering, airbags, high-voltage systems) checked by a qualified technician. To the extent the law allows, we accept no liability for repairs or decisions made from this page.
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