P0ADEHybrid/EV Battery Negative 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
- 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.
- 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
- PossibleNegative contactor coil degraded
- PossibleWeak 12 V battery during start-up
- 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.