P2E84 code meaning
Battery Charger B Input Voltage Sensor Circuit Range/Performance
What P2E84 means
P2E84 questions the plausibility of the grid voltage that charger B reads at its input: the sensor answers within its electrical limits, yet the figure does not suit the moment, such as a voltage with no supply connected or a value that contradicts other readings. No manufacturer documents P2E84 publicly. How such a check works is shown on charger A: GM's 2011 Volt compares the AC peak voltage with two internal bulk voltages and fails when both differ by more than 34 V (Type A), while Mitsubishi's Outlander PHEV reacts to 25 V or more held for 2 s. On the Polestar 3, whose AC charger reports as charger B, input sensor faults appear as P0E8B16 and lead to replacement of the unit if DC charging still works. Hard low or high readings are P2E85/P2E86. AC charging is usually refused.
P2E84 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyHard
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2E84
- AC charging does not start or stops after a short time
- DC fast charging still works normally
- Charging fault message in the instrument cluster or app
Common causes of P2E84
- Most likelyVoltage sensing inside charger B drifting or faulty
- PossibleCorroded or loose AC contacts between charge inlet and charger B
- PossibleUnstable or unusual supply from the charging station or house circuit
- Less likelyCharger software misjudging the reading
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Battery charger b input voltage sensorWiring harnessOn board charger
What each part of P2E84 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 84 | The exact fault in that area. |
What to do next
- Note P2E84 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 P2E84
What does P2E84 mean?
P2E84 means "Battery Charger B Input Voltage Sensor Circuit Range/Performance". P2E84 questions the plausibility of the grid voltage that charger B reads at its input: the sensor answers within its electrical limits, yet the figure does not suit the moment, such as a voltage with no supply connected or a value that contradicts other readings. It is a generic code, so it means the same on every make.
Is it safe to drive with P2E84?
P2E84 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P2E84 fail an emissions test?
P2E84 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P2E84 to fix?
Difficulty: hard. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P2E84 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.