P2E73Hybrid/EV Battery Pack B Cell Thickness Sensor Circuit Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2E73 indicates that the thickness sensor of pack B delivers values within range that the controller cannot reconcile with what it otherwise knows about the pack. Free expansion of a healthy cell is small, about 1 % of its thickness on the Ford Fusion HEV cell measured by GE, so a sensor must resolve fractions of a millimetre; GE's thin eddy-current coils between cells covered 0 to 2 mm. Plausibility can also come from other signals: LG patents detecting swelling from the temperature sensors already in a module, and the Michigan force method links end-plate load to capacity fade, giving references to compare against. No manufacturer documents P2E73 publicly. CARB asks for rationality checks where feasible; pack A's version is P2E6F.
- What you may notice
- Warning light, often with no other complaint
- Battery controller may limit power or charging rate
- Likely causes
- LikelySensor mounting or gap changed, for example after module work
- PossibleSensor drift or degraded sensing element
- RarePlausibility limits in the battery controller software too tight
- 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: €150 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.