Code result
P25BD
Unmetered Fuel - Forced Engine Shutdown
Moderate severity
What it means
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.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Turbocharger oil seal leak feeds engine oil into the intake
highOne of the most commonly reported causes for this code — check this first.
Oil collected in the intercooler is sucked into the engine on load
mediumA plausible cause — test and verify before replacing parts.
Failed PCV / crankcase breather floods intake with oil mist
mediumA plausible cause — test and verify before replacing parts.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose P25BD freeNo credit card required