P2E70Hybrid/EV Battery Pack B Cell Thickness
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2E70 is the swelling code for a second high-voltage pack, B, in vehicles that carry two; which pack is A and which B is set by the maker. The controller judges that cells in pack B have grown too thick. No manufacturer documents P2E70 publicly. Research explains why thickness is watched at all. A University of Michigan patent reads the force on the module end plates and uses it to estimate capacity loss, and Southwest Research Institute derives aging from the strain at equal charge level, new versus aged. In real failures far more happens: in tests by the UK HSE a heated 5 Ah pouch cell released about 4 litres of gas on average, and the force of that swelling matters most where cells sit tightly packed. Pack A swelling is P2E6C.
- What you may notice
- Hybrid or EV warning with power reduction
- Reduced range or charging blocked
- Vehicle may refuse READY
- Likely causes
- LikelyCells in pack B aged and permanently thicker
- PossibleGas generation after overcharge, deep discharge or heat
- RarePoor cooling of pack B accelerating cell degradation
- 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: €600 – €9,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.