Powertrain, generic (extended)

P2E3B Battery Charger B Output Voltage Too Low

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Charger module software fault fixed by reprogramming
Failed power stage inside charger B
High resistance in the HV output connection

Symptoms

  • MIL on and vehicle will not charge
  • Level 2 charging fails, wall box breaker may trip

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€0–2,500
Time0.3–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

on board chargerwiring harness

Related codes

P2E3AP2E3DP0D21P0E86

References: law.cornell.edu, gsi.ext.gm.com, static.nhtsa.gov, static.nhtsa.gov.