Powertrain, generic · Hybrid propulsion

P0AE2 Hybrid/EV Battery Precharge Contactor Circuit Stuck Closed

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0AE2 means the precharge path conducts although it should be open, for example welded contacts or a precharge switch that no longer turns off. GM's 2011 Volt table checks it once per precharge event: if the bus voltage already exceeds 80 % of pack voltage before precharge begins, the precharge FET is judged stuck closed, 4 of 4 samples, Type A with MIL after one trip. Mitsubishi lists P0AE2 as charging contactor seizure on the 2012 i-MiEV (TSB-12-54-014). Audi names it for the 2022 e-tron GT with a software fix, and Dodge and Jeep list P0AE2-00 for the 2025 Charger EV and 2024 Wagoneer S, where a battery pack replacement may be required. The car may refuse to start.

Likely causes

Precharge contactor contacts welded or precharge switch shorted
Battery controller software sets the code falsely (Audi, Stellantis bulletins)
Contactor driver held on by a short to power
Bus voltage not discharged before the next precharge

Symptoms

  • Vehicle does not become ready to drive
  • MIL and hybrid or EV warning on
  • Wrench symbol or service message in the cluster

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€150–6,000
Time1–8 h

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

Parts involved

hv battery precharge contactorprecharge resistor

Related codes

P0AE3P0AE1P0AA1P0AA4P0C77P0AE7

References: gsi.ext.gm.com, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.