Powertrain, generic (extended)

P2E91 Battery Charger B Internal Power Supply Performance

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P2E91 is the same verdict for charger B: one of its internally generated supply voltages is wrong, so the charger cannot run its power stages safely. Polestar uses the code on the Polestar 3, whose grid-to-high-voltage converter GHCA reports as charger B. Technical journal TJ 37630 (version 3.0, December 2025) lists P2E9117 and P2E9119, by failure-type byte voltage and current above threshold, among the GHCA codes and says to replace the GHCA when DC charging works but AC charging does not. Mercedes shows that the trigger may sit outside the unit: its bulletin for the 22 kW smart charger blames loose low-voltage plugs for P1D0BFD, an internal supply fault. Mitsubishi checks such rails under P0D67. The A-side twin is P2E90, the 12 V feed of charger B P2E2F.

Likely causes

Internal supply stage of charger B failed
Loose low-voltage connector or weak 12 V feed at charger B
Charger software fault

Symptoms

  • AC charging fails while DC fast charging still works
  • Charging time much longer or charging stops early
  • Charging socket light signals a fault

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€300–4,000
Time1–5 h

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

Parts involved

battery charger b internal psuon board charger

Related codes

P2E90P2E2FP0E8BP2DB7

References: static.nhtsa.gov, static.nhtsa.gov, mitsubishitechinfo.com, ti.com.