P2E30 code meaning
Battery Charger B Module Supply Voltage Low
What P2E30 means
P2E30 is stored when the 12 V feed reaching the control board of charger B stays under its lower limit. Most causes lie upstream: a flat or aged 12 V battery, a blown fuse or failed relay in the charger feed, or corroded supply and ground contacts that lose voltage under load. No manufacturer documents P2E30 publicly, and no threshold is published. For a sense of scale, Holley's 30-8405 charger unit names 9–16 V as its normal range and keeps CAN alive only down to 6 V; Mitsubishi's Outlander PHEV lists a faulty charger supply circuit among the causes of lost communication with the charger (U019B). Under CARB rules a charger fault that blocks charging must be flagged. Too high is P2E31, charger A low is P2E2D. Charging via path B is likely refused; driving normally continues.
P2E30 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2E30
- Charging through charger B does not start
- Low-voltage or communication faults in other modules too
- Reduced charging power if only one charger works
Common causes of P2E30
- Most likelyDischarged or aged 12 V battery
- PossibleBlown fuse or failed relay in the charger B feed
- PossibleVoltage drop across corroded supply or ground contacts
- Less likelyDC/DC converter not holding up the 12 V network
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
On board chargerWiring harness
What each part of P2E30 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 30 | The exact fault in that area. |
What to do next
- Note P2E30 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 P2E30
What does P2E30 mean?
P2E30 means "Battery Charger B Module Supply Voltage Low". P2E30 is stored when the 12 V feed reaching the control board of charger B stays under its lower limit. It is a generic code, so it means the same on every make.
Is it safe to drive with P2E30?
P2E30 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P2E30 fail an emissions test?
P2E30 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 P2E30 to fix?
Difficulty: medium. A typical repair takes 0.3 to 3 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2E30 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.