Faulty or drifting battery temperature sensor K; Damaged wiring, corrosion or poor connection at the sensor or battery monitoring module connector; Battery cooling or heating problem causing a genuine temperature difference (blocked intake, failed fan, coolant flow fault, depending on the model); Fault in the battery monitoring unit or battery control module; Sensor poorly seated or detached from its module or cell group after previous work; Outdated or faulty control unit software where the manufacturer has issued a known update.

P0C93

Hybrid/EV Battery Temperature Sensor K Range/Performance.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
C: AreaHybrid propulsion
93: FaultThe specific fault in that area

What it means

P0C93 is a generic powertrain code meaning the hybrid or EV battery temperature sensor K signal is out of range or does not make sense for the conditions. The battery control unit compared the reading with other battery temperature sensors, coolant or ambient temperature, or expected heating and cooling behaviour, and found it implausible. Which physical sensor 'K' refers to depends on the model and battery pack layout.

Symptoms

Hybrid or EV system warning light on
Reduced power or limited acceleration
Reduced charging speed or regenerative braking
Cooling fan for the battery running loudly or constantly
Reduced electric range or charge limit
Fault code stored with no other obvious symptoms

Possible causes

Faulty or drifting battery temperature sensor Klikely
Damaged wiring, corrosion or poor connection at the sensor or battery monitoring module connectorlikely
Battery cooling or heating problem causing a genuine temperature difference (blocked intake, failed fan, coolant flow fault, depending on the model)possible
Fault in the battery monitoring unit or battery control modulepossible
Sensor poorly seated or detached from its module or cell group after previous workpossible
Outdated or faulty control unit software where the manufacturer has issued a known updaterare

How to diagnose

Read all stored codes and freeze frame data, noting battery temperatures, ambient temperature and state of charge when the fault set
Check for related codes on other battery temperature sensors, cooling fan or coolant circuits, as these point to a wider cooling issue
Inspect the battery cooling air intakes, ducts, filters and fan for blockage, debris or damage, following the manufacturer's high-voltage safety procedure
Compare live data from all battery temperature sensors with the car cold after standing; they should read close to each other and to ambient
Check wiring and connectors for the sensor circuit for damage, moisture, corrosion or pushed-back pins, using only trained high-voltage procedures where required
Test the sensor signal and resistance against the manufacturer's specification, as values vary by model
Check for applicable software updates or technical bulletins for the battery control unit
Clear the code and road test, watching whether sensor K tracks the others as the pack warms

How to fix

Replace the faulty battery temperature sensor or sensor harness section as specified by the manufacturer
Repair or replace damaged wiring and clean or replace corroded connectors
Clear blocked cooling ducts or intakes and repair or replace a failed battery cooling fan or coolant component
Reseat or correctly secure the sensor in its mounting position
Update the battery control unit software if an update addresses this fault
Repair or replace the battery monitoring module if testing confirms it has failed

Can I keep driving?

Medium severity

The car can usually be driven short-term, though power and charging may be limited. Book it in soon, and stop driving if the battery warning escalates, the car goes into limp mode, or there is any smell, smoke or overheating.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.