Powertrain, generic (extended)

P2E6E Hybrid/EV Battery Pack A Cell Thickness Sensor Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2E6E is the low-side counterpart to P2E6D: the thickness or swelling sensor of pack A delivers less signal than any intact circuit should, typically from a short to ground, a missing supply or a dead sensor amplifier. No manufacturer documents P2E6E publicly. Two patents show why a low reading can hide a real problem. LG places piezo elements in the cooling gap between cells; they produce a voltage only when expanding cells press on them, which the BMS evaluates. Bosch and Samsung SDI describe a pressure film around the electrode winding whose charge is turned into a voltage by an amplifier fed from the battery. If that output collapses, the controller can no longer see swelling, so it flags the circuit. CARB requires each out-of-range fault of an input to be stored separately.

Likely causes

Signal wire shorted to ground or to the module housing
Sensor supply or amplifier supply missing
Sensing element or its amplifier failed
Moisture or coolant in a connector inside the pack creating a leakage path

Symptoms

  • Hybrid or EV warning light
  • Reduced power or limited charging

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

P2E6CP2E6DP2E6FP2E72

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