P25FF
Electrical System Voltage Stabilizer Control Module Performance
The voltage stabiliser module (DC/DC converter for stop-start engine cranking events) does not maintain the regulated 12 V output during high transient loads. Sensitive electronics may reset during cranking.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Aged smoothing capacitors lose capacitanceCommon
- Battery condition causes input voltage to drop too farPossible
- Internal fault in the converter switching stagePossible
Parts involved
- Voltage Stabilizer Module
- Dc Dc Converter
P25FF 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.