P25BD: Unmetered Fuel - Forced Engine Shutdown
Standardized SAE J2012 code · P25xx — Auxiliary inputs
What does P25BD mean?
The engine controller commanded a forced shutdown after detecting unmetered fuel reaching the combustion chambers. Common on diesels with leaking turbo seals or cracked intercoolers that drip oil into the intake — the engine then runs on the oil and can overspeed.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Turbocharger oil seal leak feeds engine oil into the intake
- Medium Oil collected in the intercooler is sucked into the engine on load
- Medium Failed PCV / crankcase breather floods intake with oil mist
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P25BD on the same make and model first.
P25BD in the community
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