Powertrain, generic · Hybrid propulsion

P0ADE Hybrid/EV Battery Negative Contactor Control Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0ADE is set when the coil circuit of the negative main contactor works electrically but its values are implausible, such as coil current or hold voltage out of range or a slow response after the command. No manufacturer publicly documents this code; GM, whose tables cover the negative contactor driver codes P0ADD, P0ADF and P0AE0 in detail, does not use P0ADE. CARB 1968.2 requires rationality and functional checks on hybrid output components. The contact-side faults P0AA4 (stuck closed) and P0AA5 (stuck open) are separate diagnoses. Possible effects are an intermittent failure to reach ready mode or charge.

Likely causes

High resistance in coil wiring or connector
Negative contactor coil degraded
Weak 12 V battery during start-up
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 neg contactorwiring harnessbms

Related codes

P0ADDP0ADFP0AE0P0AA4P0AA5P0ADA

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