P2E73 code meaning
Hybrid/EV Battery Pack B Cell Thickness Sensor Circuit Performance
Powertrain system Generic code P2Exx codes Check engine light
What P2E73 means
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.
P2E73 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1.5 to 8 hours
- Clears after repairAfter a drive cycle
Symptoms of P2E73
- Warning light, often with no other complaint
- Battery controller may limit power or charging rate
Common causes of P2E73
- Most likelySensor mounting or gap changed, for example after module work
- PossibleSensor drift or degraded sensing element
- Less likelyPlausibility limits in the battery controller software too tight
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hybrid battery pack bHybrid battery pack b thickness sensorBms
What each part of P2E73 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 73 | The exact fault in that area. |
What to do next
- Note P2E73 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2E73
What does P2E73 mean?
P2E73 means "Hybrid/EV Battery Pack B Cell Thickness Sensor Circuit Performance". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P2E73?
Drive gently and only to a workshop. With P2E73 the car can go into limp mode (reduced power) to protect itself.
Will P2E73 fail an emissions test?
Yes, it can. P2E73 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2E73 to fix?
Difficulty: workshop only. A typical repair takes 1.5 to 8 hours of work. This is a job for a workshop.
Will P2E73 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.