P0C34Hybrid/EV Battery Temperature Sensor F Circuit Range/Performance
- 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
- P0C34 checks whether sensor F, GM's sensor 6, agrees with the rest of the pack. The controller compares its reading with the average of the other battery temperature sensors. GM's 2016 hybrid table fails it above 25 °C difference in 50 of 67 samples; the Volt and plug-in tables of 2016 to 2019 use 20 °C, in 2018 for 5 s within 6.7 s; the air-cooled eAssist (13OBDG05C) allows only 8.55 °C and tests only after more than six hours with the module off. All are Type B, two trips. Active circuit codes suspend the test, so P0C34 means a sensor that reads wrongly but within range, or a real local hot or cold spot. Volt bulletin 18-NA-342 names it sensor 6 performance among codes that set in cold weather without a hardware fault.
- What you may notice
- MIL on after two trips
- Battery too cold or reduced power message
- Limited charge and discharge power
- Likely causes
- PossibleSensor F drifting or poorly seated on its cell group
- PossibleModule software setting the code falsely in the cold (GM Volt)
- RareReal local temperature difference from a weak cell group or uneven cooling
- 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: €60 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.