P0C72: Hybrid/EV Battery Temperature Sensor E/F Correlation

P0C72 is the agreement test between battery temperature sensors E and F. The controller stores it when the two readings stay apart by more than a calibrated margin after the pack has had time to even out. No manufacturer documents P0C72 publicly; GM names the matching single-sensor plausibility codes P0BC3 (sensor 5) and P0C34 (sensor 6) and compares each with the pack average, Type B. On the Chevrolet Volt GM traced false sensor codes, together with a battery-too-cold message above -25 °C, to module software and cured them by reprogramming (18-NA-342), so a software check comes before any pack work. If the fault is real, a drifting thermistor, a sensor that lost contact with its module or uneven coolant flow are typical. Battery power is then limited. The D/E pair is P0C71.

High severity. Can I keep driving?If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

Symptoms

Hybrid or EV system warning lamp
Battery-too-cold or similar message although it is not very cold
Reduced electric power and range

Most likely causes

Thermistor E or F drifted without an electrical fault
Battery module software that reports sensor faults falsely, fixed by reprogramming
Sensor detached from its cell group
Uneven coolant or air flow through the pack

What to check, in order

Start with the simplest. You can tick off each step.

Read the codes with a hybrid-compatible scanner and write down the freeze frame data
Compare both signals at the same time in live data and check any recent installation work.
Make sure the battery cooling air intake is clean
Check the 12 V auxiliary battery, which can also trigger warnings
Leave any high-voltage measurements to a specialized repair shop

Good to know

It can trigger limp mode.
It affects emissions.

What each character of P0C72 means

P: Powertrain: engine and transmission
0: Generic code: same on every make
C: Subsystem depends on the code range
72: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0C72?

If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

What causes code P0C72?

The most common causes are: thermistor E or F drifted without an electrical fault; battery module software that reports sensor faults falsely, fixed by reprogramming; sensor detached from its cell group.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.