Powertrain, generic (extended)

P2E6F Hybrid/EV Battery Pack A Cell Thickness Sensor Circuit Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2E6F covers a thickness sensor in pack A whose reading is electrically valid but does not behave as the controller expects. Cell thickness is not static: it rises and falls with state of charge, which is why Bosch and Samsung SDI propose using the swelling force of the winding to estimate charge and health, and a graphene film sensor studied at Warwick tracked charge level from expansion alone. A sensor that stays frozen while the pack is charged and discharged, or drifts against that pattern, is therefore suspect. Nebraska and Oak Ridge researchers found that expansion also depends on current, charge voltage and clamping force, so limits must be wide. No manufacturer documents P2E6F publicly. CARB asks for such rationality checks where feasible.

Likely causes

Sensor loosened, shifted or no longer bonded to the cell or end plate
Sensor drifting with age or temperature
Contact resistance in connectors distorting the reading
Missing calibration or relearn after module replacement

Symptoms

  • Warning light without noticeable driving change at first
  • Charging or power may be restricted later

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€150–2,500
Time1.5–8 h

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

Parts involved

hybrid battery pack ahybrid battery pack a thickness sensorbms

Related codes

P2E6CP2E6DP2E6EP2E73

References: law.cornell.edu, image-ppubs.uspto.gov, pmc.ncbi.nlm.nih.gov, osti.gov.