Powertrain, generic (extended)

P2BEA Hybrid/EV Battery Precharge Contactor Control Circuit B Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2BEA is stored when control circuit B of the precharge function carries less voltage than its state requires, mostly because the coil feed touches ground or the output is pulled down. With a high-side driver the coil then gets no current and the second precharge path stays open. No manufacturer documents P2BEA publicly. GM's 2016 test of the contactor A equivalent (P0AE6) checks the driver output while it is commanded on and fails below 5.35 V, 13 of 16 samples at 12.5 ms, Type B, two trips, with the 12 V supply above 10.2 V. GM also notes that its open test cannot see a short to ground, which is why this case has its own code. CARB requires circuit checks on hybrid outputs. The high side is P2BEB.

Likely causes

Coil feed chafed and shorted to ground
Coil of precharge contactor B shorted internally
Driver stage of the battery controller pulled low

Symptoms

  • Vehicle does not become ready to drive
  • MIL and hybrid or EV warning on

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–2,500
Time1–5 h

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

Parts involved

hv battery precharge contactor bwiring harnessbms

Related codes

P2BEBP2BE8P2BE9P0AE6

References: law.cornell.edu, gsi.ext.gm.com, gsi.ext.gm.com.