What are the common causes of P0C71?

A faulty hybrid battery thermistor. A faulty battery smart unit. An open or short in the battery thermistor harness. A poor electrical connection at the thermistor connector.

Read battery temperature sensors D and E on a scan tool. Compare sensor D and sensor E readings for a difference. Inspect the thermistor connectors and harness. Test the sensor D and E circuits for open and short faults. Replace the battery smart unit if the two readings stay apart. Clear the code and retest.

P0C71

Hybrid/EV Battery Temperature Sensor D/E Correlation

System: Powertrain control (P code)
Lamp: Check Engine Light
Category: Powertrain - Fuel/Air Metering

What it means

P0C71 means Hybrid/EV Battery Temperature Sensor D/E Correlation.

Where it lives

For P0C71, start at the sensor the description names.

Check these first

A faulty hybrid battery thermistor
A faulty battery smart unit
An open or short in the battery thermistor harness
A poor electrical connection at the thermistor connector

What to do next

Read battery temperature sensors D and E on a scan tool
Compare sensor D and sensor E readings for a difference
Inspect the thermistor connectors and harness
Test the sensor D and E circuits for open and short faults
Replace the battery smart unit if the two readings stay apart
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.