P0C92
Hybrid/EV Battery Temperature Sensor K Circuit.
- Generic
- Powertrain
- Generic code
- Medium severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- C
- AreaHybrid propulsion
- 92
- FaultThe specific fault in that area
What it means
P0C92 is a generic powertrain code meaning a fault has been detected in the circuit of temperature sensor 'K' in the hybrid or EV traction battery. The battery control unit compares the sensor signal with expected limits, and sets the code when the voltage or resistance is out of range, implausible or erratic. Which physical sensor is 'K' and where it sits in the pack depends on the model and battery design.
Symptoms
- Hybrid or EV system warning light, or malfunction indicator lamp, on
- Reduced power or limited performance mode
- Reduced regenerative braking or battery charging
- Cooling fan for the traction battery running louder or more often than normal
- Reduced electric range or the engine running more often on a hybrid
- Slower charging or charging not starting
Possible causes
- Fault in the battery temperature sensor 'K' itself, reading out of range or driftinglikely
- Damaged, chafed, open-circuit or shorted wiring between the sensor and the battery monitoring unitlikely
- Corroded, loose or contaminated connector terminals at the sensor or battery control unitpossible
- Fault in the battery monitoring module or battery control unit input circuitpossible
- Moisture ingress or coolant leak affecting the pack electronics or sensor harnessrare
- Outdated control unit software where the manufacturer has issued a correction for this faultrare
How to diagnose
- Read all stored codes and freeze frame data, noting any other battery temperature or battery monitoring codes, and check whether the fault is current or historic.
- Check for manufacturer service bulletins or software updates relating to this code for the specific model.
- Compare live data from all battery temperature sensors on a cold car; the readings should be close to each other and to ambient temperature.
- Visually inspect accessible wiring and connectors for damage, corrosion, water or loose pins, following the manufacturer's high-voltage safety procedure.
- Wiggle-test the harness with live data on screen to look for readings that jump or drop out.
- With the system safely isolated by a trained person, measure the sensor resistance and the circuit for open circuit, short to earth or short to supply, comparing with the manufacturer's specification.
- Check the battery monitoring unit's supply, earth and sensor reference voltage as per the wiring diagram.
- Clear the code and road test to see if it returns, then recheck the live data.
How to fix
- Replace the faulty battery temperature sensor or sensor assembly as the manufacturer directs.
- Repair or replace damaged wiring, or renew the harness section if the fault is within it.
- Clean or replace corroded connectors and terminals, and make sure they are fully seated and sealed.
- Replace or repair the battery monitoring unit or control unit if the input circuit is confirmed faulty.
- Dry out and rectify any source of moisture ingress, and apply a software update if the manufacturer lists it as a fix for this fault.
Can I keep driving?
The car may usually be driven for a short time, but it may be in a limited-power mode and the battery cannot be monitored properly, so have it checked soon. Stop driving if a red hybrid or battery warning appears, or you notice a burning smell, heat or smoke from the battery area.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.