P0CB1Hybrid/EV Battery Temperature Sensor N Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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.
- What you may notice
- Intermittent warning lamp
- Sensor N value jumping in live data
- Likely causes
- LikelyLoose or fretting pin in the sensor N circuit
- PossibleChafed or partly broken sensor N lead
- RareCracked track on the monitoring board
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.