Powertrain, generic · Hybrid propulsion

P0ADB Hybrid/EV Battery Positive Contactor Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0ADB means the drive circuit of the positive main contactor reads too low, mostly a short to ground. GM uses it widely: 2016-19 tables set it when the control voltage stays under 5.35 V with the contactor commanded on, 13 of 16 samples, Type B. The 2013 eAssist battery controller checks the low-side driver in the off state for a short to ground or an open circuit, 3 of 5 samples, two trips. Audi lists P0ADB00 in battery management 2 (J1120) of 2019-22 A6 to Q8 models with a software fix (TSB 2066205), and Dodge names it for the 2024 Charger EV (TSB 08-071-25). The battery then cannot be connected, so the vehicle will not become ready.

Likely causes

Coil control wire shorted to ground
Contactor coil internally shorted
Battery controller software sets the code (Audi, Dodge bulletins)
Driver stage in the battery controller defective

Symptoms

  • Vehicle does not start; multiple warnings in the cluster
  • Hybrid or EV warning light
  • Charging not possible

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 pos contactorwiring harnessbms

Related codes

P0AD9P0ADAP0ADCP0ADFP0AE6

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