P0CB1: Hybrid/EV Battery Temperature Sensor N Circuit Intermittent/Erratic

P0CB1 points to an unsteady sensor N signal rather than a lasting short or open. GM's 2019 table 19OBDG02 evaluates windows of ten samples, one every 100 ms, by integrating the absolute value of each change; above 10 the window counts as failed, and 4 failed windows within 5 set the code, Type B, two trips. It needs more than 10.2 V supply and an active data link to the battery interface control module. The 2016 table 16OBDG02 already ran this jitter test, there with U179C as a blocking code. Mitsubishi assigns no erratic code to sensor [13]. Because readings can stay inside the valid band, P0CAF and P0CB0 often remain absent. Loose pins, a damaged sensor lead or a cracked board track are likely, and the fault may come and go with temperature or vibration.

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

Intermittent warning lamp
Sensor N value jumping in live data

Most likely causes

Loose or fretting pin in the sensor N circuit
Chafed or partly broken sensor N lead
Cracked track on the monitoring board

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
Gently move the wiring with the engine running and watch whether the reading changes.
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 P0CB1 means

P: Powertrain: engine and transmission
0: Generic code: same on every make
C: Subsystem depends on the code range
B1: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0CB1?

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 P0CB1?

The most common causes are: loose or fretting pin in the sensor N circuit; chafed or partly broken sensor N lead; cracked track on the monitoring board.

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.