Powertrain, generic (extended)

P2E36 Battery Charger B Enable Circuit Low

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P2E36 means the enable signal to charger B is pulled under the level its commanded state allows, most often by a short to ground or by a driver stage that cannot pull the line up. No manufacturer documents P2E36 publicly. On the common active-high layout, which Holley's 30-8405 charger unit uses with a 12 V wake-up input drawing about 20 mA, a grounded line simply means the charger never receives its wake request. Lear's patent on waking an on-board charger from the pilot signal explains the background: the charger sleeps to spare the 12 V battery and needs a valid wake signal to start. A hard short may also overload the output stage in the commanding module. GM documents only the general A-side code P0E61. High is P2E37, open P2E35, charger A low P0E62. Charging via charger B fails.

Likely causes

Enable wire chafed and shorted to ground
Water or corrosion in the charger B signal connector
Damaged high-side driver in the commanding module

Symptoms

  • Charger B stays off whenever charging is requested
  • Lower charging power or no charging

Repair estimate

DifficultyHardWorkshop job
Parts and labour€60–2,500
Time0.5–4 h

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

Parts involved

on board chargerwiring harness

Related codes

P2E35P2E37P2E38P0E62

References: law.cornell.edu, documents.holley.com, image-ppubs.uspto.gov, gsi.ext.gm.com.