P0ADAHybrid/EV Battery Positive Contactor Control Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Vehicle will not enter ready mode or start
- Hybrid or EV warning light and check engine light
- Charging not possible
- Likely causes
- LikelyHigh resistance in coil wiring or connector (corrosion, fretting)
- PossibleContactor coil degraded or partially shorted
- PossibleLow 12 V supply during contactor closing
- RareBattery controller fault or software
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.