P0C82: Hybrid/EV Battery Temperature Sensor H Circuit Range/Performance

P0C82 is the plausibility test for sensor H: its circuit is fine, but the temperature it reports strays too far from what the rest of the pack says. On the 2016 Cadillac ELR (16OBDG01) GM fails it when the reading differs from the average of the other module groups by more than 20 °C in 50 of 67 samples, Type B; the 2019 table 19OBDG02 allows 25 °C, sampled every 25 ms and only while no low, high or communication fault is active. Mitsubishi files it under sensor [07] in the Outlander PHEV and checks once per drive after an hour of soak against a 13 °C limit. GM bulletin 18-NA-342 names it sensor 8 performance and treats false sets on the Volt with reprogramming. A sensor that came loose from its cells or slowly drifted is the typical real cause.

Symptoms

• Check-engine or hybrid lamp, often after the car has stood for a while
• Battery power limited

Most likely causes

• Thermistor H reading off while still electrically valid
• Sensor H lifted off its module, measuring air instead of cells
• Outdated battery module software (GM Volt, 18-NA-342)
• Genuine local temperature difference from poor coolant flow

What to check, in order

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

1. Read the codes with a hybrid-compatible scanner and write down the freeze frame data
2. Compare the reading with other engine data while varying the engine speed.
3. Make sure the battery cooling air intake is clean
4. Check the 12 V auxiliary battery, which can also trigger warnings
5. 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 P0C82 means

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

Frequently asked questions

Can I keep driving with code P0C82?

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 P0C82?

The most common causes are: thermistor H reading off while still electrically valid; sensor H lifted off its module, measuring air instead of cells; outdated battery module software (GM Volt, 18-NA-342).

Related codes

• P0C81Hybrid/EV Battery Temperature Sensor H Circuit
• P0C83Hybrid/EV Battery Temperature Sensor H Circuit Low
• P0C84Hybrid/EV Battery Temperature Sensor H Circuit High
• P0C85Hybrid/EV Battery Temperature Sensor H Circuit Intermittent/Erratic
• P0C7DHybrid/EV Battery Temperature Sensor G Circuit Range/Performance
• P0C89Hybrid/EV Battery Temperature Sensor I Circuit Range/Performance
• P0C87Hybrid/EV Battery Temperature Sensor G/H Correlation

Sources

• gsi.ext.gm.com: 16OBDG01 Hybrid Diagnostics
• gsi.ext.gm.com: 19OBDG02 Hybrid Diagnostics
• static.nhtsa.gov: MC 10155116 9999
• mitsubishitechinfo.com: M15494077A026000USA

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.