OBD-II code · Powertrain (generic, extended)
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.
Is it safe to drive with P25FF?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyAged smoothing capacitors lose capacitance
- PossibleBattery condition causes input voltage to drop too far
- PossibleInternal fault in the converter switching stage
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–3.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Voltage Stabilizer Module, Dc Dc Converter
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.