P0CB5Hybrid/EV Battery Temperature Sensor O 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
- P0CB5 is stored when the input of sensor O sits above its upper voltage limit. An open thermistor, a broken wire or a loose plug lets the pull-up resistor raise the input, so the controller sees a temperature colder than any real pack could be. GM sets it in the HPC2 table 18OBDG02 when 8 of 10 readings at 100 ms intervals come out below −69 °C, Type B, with supply above 10.2 V and intact communication with the battery interface module. The 2011 Volt table drew the line at −40 °C, a raw count above 4,000, for 1.4 s within 2 s, and there one trip sufficed. For the Outlander PHEV, Mitsubishi reads P0CB5 as an open circuit of module sensor [14]: above 3.97 V, below about −62 °C, for 2 s. A plug-in may then warm the pack for nothing or run the engine more; P0CB4 is the low twin.
- What you may notice
- Pack shown as extremely cold regardless of weather
- Less electric power, engine running more on plug-in hybrids
- Likely causes
- LikelyOpen lead or unplugged connector of sensor O
- PossibleThermistor O open internally
- RareCorroded or loose terminal at the sensing 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.