P0C72Hybrid/EV Battery Temperature Sensor E/F Correlation
- 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
- P0C72 is the agreement test between battery temperature sensors E and F. The controller stores it when the two readings stay apart by more than a calibrated margin after the pack has had time to even out. No manufacturer documents P0C72 publicly; GM names the matching single-sensor plausibility codes P0BC3 (sensor 5) and P0C34 (sensor 6) and compares each with the pack average, Type B. On the Chevrolet Volt GM traced false sensor codes, together with a battery-too-cold message above -25 °C, to module software and cured them by reprogramming (18-NA-342), so a software check comes before any pack work. If the fault is real, a drifting thermistor, a sensor that lost contact with its module or uneven coolant flow are typical. Battery power is then limited. The D/E pair is P0C71.
- What you may notice
- Hybrid or EV system warning lamp
- Battery-too-cold or similar message although it is not very cold
- Reduced electric power and range
- Likely causes
- LikelyThermistor E or F drifted without an electrical fault
- PossibleBattery module software that reports sensor faults falsely, fixed by reprogramming
- PossibleSensor detached from its cell group
- RareUneven coolant or air flow through the pack
- 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: €80 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.