P0CB9Hybrid/EV Battery Temperature Sensor P Circuit Low
- 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
- P0CB9 means the voltage of sensor P has fallen under the valid range. As with the other NTC sensors, low voltage corresponds to high temperature, so a short to ground or a collapsed thermistor makes the module appear to be glowing hot. In GM's HPC2 tables 18OBDG02 and 19OBDG02 the code is set after 8 of 10 readings above 160 °C at 100 ms spacing, Type B, two trips, once system voltage exceeds 10.2 V and the battery interface module communicates. The 2011 Volt table already contained it with 87.5 °C, a raw count below 680, held 1.4 s within 2 s. Mitsubishi treats P0CB9 as a short of module sensor [15] of the Outlander PHEV, below 0.12 V for 2 s, lists no fail-safe function and names battery module or cell monitoring unit as the parts to replace. A genuinely hot pack is reported by P0A7E.
- What you may notice
- Module P shown as extremely hot in live data
- Severe power limitation with warning lamp
- Likely causes
- LikelySensor P signal shorted to ground
- PossibleThermistor P internally shorted
- RareDamaged input of the cell monitoring unit for sensor P
- 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: €150 – €3,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.