P2E3B code meaning
Battery Charger B Output Voltage Too Low
What P2E3B means
P2E3B is set when the high-voltage output of charger B stays below what the control unit expects while charging. No manufacturer documents P2E3B publicly. For the A-side code P0D21, GM's 2016 tables for the Cadillac ELR use a fixed floor: in constant-current as well as constant-voltage mode the charger bus must not drop under 150 V, and 8 failures in 10 samples set the code as Type B. Stellantis stores P0D21-00 in the integrated dual charging module (IDCM) with the MIL on and the car refusing to charge, on the 2021 Wrangler 4xe (TSB 08-260-26, some cars also tripping the house circuit breaker) and the 2022 Pacifica plug-in hybrid (TSB 08-334-26); the fix in both is IDCM software. CARB requires such charger faults to be caught. Imprecise output is P2E3A, a short P2E3D.
P2E3B at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.3 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2E3B
- MIL on and vehicle will not charge
- Level 2 charging fails, wall box breaker may trip
Common causes of P2E3B
- Most likelyCharger module software fault fixed by reprogramming
- PossibleFailed power stage inside charger B
- Less likelyHigh resistance in the HV output connection
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 P2E3B means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 3B | The exact fault in that area. |
What to do next
- Note P2E3B 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 P2E3B
What does P2E3B mean?
P2E3B means "Battery Charger B Output Voltage Too Low". P2E3B is set when the high-voltage output of charger B stays below what the control unit expects while charging. It is a generic code, so it means the same on every make.
Is it safe to drive with P2E3B?
P2E3B does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P2E3B fail an emissions test?
P2E3B 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 P2E3B to fix?
Difficulty: workshop only. A typical repair takes 0.3 to 4 hours of work. This is a job for a workshop.
Will P2E3B clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.