Powertrain, generic (extended)

P2E39 Battery Charger B Fuse

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P2E39 concerns the high-voltage fuse in the branch between the traction battery and charger B. Battery management units usually judge such fuses by comparing the voltage behind the fuse with the pack voltage; Volvo's technical journal TJ 37376 on BECM codes P0A9500 and P0E2F00 has technicians read exactly those values at the fuse outputs. No manufacturer documents P2E39 publicly. For the A-side code P0E2E00 Audi describes a 2022 Q5 plug-in hybrid case: the J840 battery regulation module logs it intermittently after very dynamic cornering through a diagnostic irregularity, replacing the switching unit does not help, a software update does. A really blown charger B fuse stops charging through that path. Other HV fuses are P0A95 and P0E2F, the A twin P0E2E.

Likely causes

Fuse opened by an internal short in charger B
Spurious entry from battery management software
Faulty voltage sensing behind the fuse

Symptoms

  • Charging through charger B no longer possible
  • Electrical system or high-voltage warning

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–3,000
Time0.5–4 h

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

Parts involved

high voltage fuseon board chargerbattery energy control module

Related codes

P0E2EP0A95P0E2FP2E3D

References: law.cornell.edu, static.nhtsa.gov, static.nhtsa.gov.