Powertrain, generic · Hybrid propulsion

P0C72 Hybrid/EV Battery Temperature Sensor E/F Correlation

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

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.

Likely causes

Thermistor E or F drifted without an electrical fault
Battery module software that reports sensor faults falsely, fixed by reprogramming
Sensor detached from its cell group
Uneven coolant or air flow through the pack

Symptoms

  • Hybrid or EV system warning lamp
  • Battery-too-cold or similar message although it is not very cold
  • Reduced electric power and range

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–2,500
Time0.5–6 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

hv battery temp sensor ehv battery temp sensor fbms

Related codes

P0C71P0C70P0BC3P0C34

References: static.nhtsa.gov, gsi.ext.gm.com, mitsubishitechinfo.com, law.cornell.edu.