Powertrain, generic · Hybrid propulsion

P0ADA Hybrid/EV Battery Positive Contactor Control Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0ADA describes a positive contactor coil circuit that is electrically present but does not behave plausibly: coil current, voltage or response time outside the expected window, for instance due to high resistance or an unstable PWM hold signal. No manufacturer publicly documents this code; GM, which details the positive contactor driver codes P0AD9, P0ADB and P0ADC with Type B logic and sample counters, does not list P0ADA. CARB 1968.2 requires functional and rationality checks of hybrid output components. It must be separated from the contact-side codes P0AA1 (stuck closed) and P0AA2 (stuck open). Drivers may see intermittent no-start or loss of ready mode.

Likely causes

High resistance in coil wiring or connector (corrosion, fretting)
Contactor coil degraded or partially shorted
Low 12 V supply during contactor closing
Battery controller fault or software

Symptoms

  • Vehicle will not enter ready mode or start
  • Hybrid or EV warning light and check engine 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

P0AD9P0ADBP0ADCP0AA1P0AA2P0ADE

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