P2C46
Battery Isolation/Voltage Stabilization Control Circuit High
The battery isolation/voltage stabilization module reports a control circuit high condition. Power supply quality during start/stop or load shedding is impaired.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Control wire shorted to B+Common
- Open module inputPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Battery Isolation Module
- Wiring Harness
- ECM
P2C46 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.