P0CB0Hybrid/EV Battery Temperature Sensor N Circuit High
- 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
- P0CB0 reports a sensor N input above its upper voltage limit, which a pack controller reads as an unrealistically cold module. The NTC sensor is biased by a pull-up resistor, so any interruption in the element, its leads or its plug makes the input rise. GM's 2018 HPC2 table 18OBDG02 lists P0CB0 by name as sensor N circuit high and fails it when 8 of 10 readings at 100 ms are below −69 °C, Type B, two trips; the 2016 table 16OBDG02 uses the same limit and blocks the test while U179C is set. Mitsubishi's Outlander PHEV DTC chart names it the open circuit of sensor [13], judged above 3.97 V, below about −62 °C, for 2 s. Assuming a frozen pack, the controller cuts electric power and plug-ins may switch on heating or the engine. Shorts are covered by P0CAF.
- What you may notice
- Battery reported as far too cold in mild conditions
- Less electric range or power, engine starting more often
- Likely causes
- LikelyOpen lead or disconnected plug of sensor N
- PossibleThermistor N open internally
- RareCorroded terminal at 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 – €3,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.