What it means
The HV battery temperature sensor K reports a range/performance fault. Cell-group temperature monitoring impaired on this channel.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
The HV battery temperature sensor K measures temperature at its assigned battery location for thermal protection and charging decisions. This code sets when its signal is present but its value or response falls outside the expected range or performance pattern.
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
- Record freeze-frame data and compare live sensor K temperature with nearby battery sensor readings under similar conditions.
- Inspect the sensor K connector and accessible wiring for loose terminals, corrosion, or damage that could affect its reading.
- Check that sensor K is positioned and mounted as intended, since displacement can make its reading differ from the battery area it monitors.
- Watch sensor K data as pack temperature changes and look for a delayed, implausible, or inconsistent response relative to adjacent channels.
- Test the sensor K response and circuit using the manufacturer's procedure; replace the sensor only after checking mounting and wiring.
Common fixes
- Correct sensor K positioning or mounting.
- Repair poor connector contact or damaged sensor K wiring.
- Replace sensor K if its response is outside the manufacturer's specification.
- Clear the code and confirm sensor K readings track plausibly after repair.
Can I keep driving?
The system may restrict power or charging if it cannot trust sensor K's temperature response. Avoid heavy acceleration and prolonged charging until diagnosed, and stop if a battery warning or major power loss occurs.
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.