Powertrain, generic (extended)

P2E6C Hybrid/EV Battery Pack A Cell Thickness

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2E6C means the cells of high-voltage pack A have become thicker than the battery controller tolerates: the cells are swelling. A healthy cell only breathes a little while charging; GE and University of Michigan measured about 0.1 mm, 1 % of its thickness, on the Sanyo cell of Ford's Fusion HEV pack. Lasting growth comes from aging or from gas after overcharge or overheating. No manufacturer documents P2E6C publicly. Kia shows a comparable guard: on the 2017 Niro hybrid a switch on the pack closes when cells bulge after overcharge, and the BMS then opens the main relays (P1BA7). A Ford patent likewise lets the BECM reduce current or open contactors when cell pressure is too high. Expect power limits or no READY; P2E6D to P2E6F are faults of the sensor itself.

Likely causes

Aged cells in pack A that have grown permanently thicker
Gas build-up in cells after overcharging or overheating
Module clamping or end plates loosened, so cells can expand further

Symptoms

  • Hybrid or EV system warning, often with reduced power
  • Vehicle may not switch to READY because the main contactors stay open
  • Charging blocked or limited

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€600–9,000
Time2–10 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

P2E6DP2E6EP2E6FP2E70P0A7FP0A7E

References: law.cornell.edu, static.nhtsa.gov, image-ppubs.uspto.gov, osti.gov.