P0C70: Hybrid/EV Battery Temperature Sensor C/D Correlation

P0C70 is the correlation check between battery temperature sensors C and D. The controller expects both to settle at nearly the same value once the pack has rested, and it stores the code when their difference stays too large. No manufacturer documents P0C70 publicly. Where GM and Mitsubishi publish this monitor, they compare each sensor with the pack average and name the single sensor; GM's sensor 4 code P0AE9 is the D counterpart. Before replacing parts it is worth knowing that GM cured false sets of these Volt sensor codes, shown with a battery-too-cold message, by reprogramming the module (18-NA-342). Genuine faults are a drifting thermistor, a sensor that lost contact with its cells, or uneven cooling. The battery controller usually limits power. P0C71 continues with D/E.

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

Malfunction indicator lamp or EV system warning
Message asking to plug in or warm the battery
Reduced electric power and slower charging

Most likely causes

Thermistor C or D drifted out of agreement with the other
Battery control software that sets the code falsely, for example in cold weather
Sensor C or D detached from its cell group
Uneven cooling across the pack, such as a blocked air duct or coolant channel

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 P0C70 means

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

Frequently asked questions

Can I keep driving with code P0C70?

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 P0C70?

The most common causes are: thermistor C or D drifted out of agreement with the other; battery control software that sets the code falsely, for example in cold weather; sensor C or D 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.