P0C83
Hybrid/EV Battery Temperature Sensor H Circuit Low.
- Generic
- Powertrain
- Generic code
- Medium severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- C
- AreaHybrid propulsion
- 83
- FaultThe specific fault in that area
What it means
P0C83 means the hybrid or EV battery control unit has detected that the signal from battery temperature sensor 'H' is lower than the expected range. The unit normally reads sensor voltage and converts it to a temperature, so a low voltage suggests a short to ground, a wiring fault or a faulty sensor. Which physical sensor is 'H' depends on the vehicle, so check the manufacturer's information for the exact location.
Symptoms
- Hybrid or EV system warning light on the dashboard
- Reduced power or limp-home mode
- Reduced charging or regeneration
- Battery cooling fan running constantly or not as expected
- Reduced electric range or the engine running more often on a hybrid
Possible causes
- Faulty battery temperature sensor (internal short or very low resistance)likely
- Sensor signal wire shorted to ground, for example from chafed insulationlikely
- Damaged, corroded or contaminated connector or terminals at the sensor or battery control unitpossible
- Moisture or coolant ingress in the battery pack harness or sensor connectionpossible
- Fault in the battery control unit's sensor input circuitrare
- Damage to the harness from previous repair work or a collisionrare
How to diagnose
- Read all stored and pending codes and note the freeze frame data; look for other battery temperature or voltage codes alongside P0C83.
- Only proceed if you are trained in high-voltage systems; follow the manufacturer's procedure to make the system safe before touching any battery pack wiring.
- Compare live data from all battery temperature sensors on a cold car; a sensor 'H' reading that is extremely high or out of line with the others points to that circuit.
- Inspect the accessible harness and connectors for chafing, pinching, corrosion, water ingress or damaged pins.
- Check the sensor circuit for a short to ground and for the correct reference voltage, using the wiring diagram for that model.
- Measure the sensor resistance and compare it with the manufacturer's resistance-to-temperature data.
- Wiggle-test the harness with live data displayed to see if the reading changes suddenly, which indicates an intermittent fault.
- If the wiring and sensor are good, check the battery control unit's power, ground and input circuit as per manufacturer diagnostics.
How to fix
- Replace the faulty battery temperature sensor following the manufacturer's high-voltage procedure.
- Repair or replace the damaged wiring where it is shorted to ground, using the correct specification of wire and insulation.
- Clean or replace the corroded or damaged connector and terminals, and fix any source of moisture.
- Replace or repair the battery control unit only after the sensor and wiring have been proven good, and complete any required setup.
- After the repair, clear the codes and road test, checking that the sensor reading is plausible and the code does not return.
Can I keep driving?
The car can usually be driven for a short time, but the system may limit power or charging because it cannot monitor battery temperature properly. Have it checked soon, and stop if warnings escalate, there is a burning smell or the battery overheats.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.