What Does P02BF Mean?
The ECM has detected that the individual fuel trim correction for cylinder 10 has reached its minimum limit. The system is removing the maximum possible fuel from cylinder 10 but still detects a rich condition. This code applies to engines with 10+ cylinders. The driver may notice rough running, black exhaust smoke, poor fuel economy, and strong fuel odor.
Common Causes
35%
Leaking cylinder 10 fuel injector allowing excess fuel into the combustion chamber when closed
20%
Faulty injector driver circuit or ECM holding cylinder 10 injector open longer than commanded
20%
Carbon buildup on cylinder 10 intake valve (GDI engines) causing poor atomization and incomplete combustion
15%
Low compression on cylinder 10 causing incomplete combustion and raw fuel in exhaust
10%
Fuel-contaminated engine oil or PCV system fault affecting bank O2 sensor readings
Diagnostic Steps
1
Review live data for cylinder 10 individual fuel trim — confirm it is at or near the maximum negative correction limit (typically -25% to -30%).
2
Perform a relative compression test via cranking RPM analysis to verify cylinder 10 has adequate compression — low compression causes poor combustion that reads as rich.
3
Remove and inspect the cylinder 10 spark plug for heavy black carbon fouling or wet fuel deposits.
4
With the fuel rail removed, apply regulated fuel pressure and observe the cylinder 10 injector tip for dripping — no more than 1 drop per minute.
5
Check the cylinder 10 injector wiring for short circuits and verify injector resistance (typically 11-17 ohms).
Estimated Repair Cost
$200 - $650
Parts + labor, varies by vehicle and location
The ECM has detected that the individual fuel trim correction for cylinder 10 has reached its minimum limit. The system is removing the maximum possible fuel from cylinder 10 but still detects a rich condition. This code applies to engines with 10+ cylinders. The driver may notice rough running, bla...
The most common cause of P02BF (Cylinder 10 - Fuel Trim at Min Limit) is: Leaking cylinder 10 fuel injector allowing excess fuel into the combustion chamber when closed
Typical repair costs for P02BF range from $200 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Can be driven short distances but should be repaired promptly. Persistent rich operation on cylinder 10 washes oil from the cylinder walls, damages the catalytic converter, and in severe cases creates a fire risk from raw fuel in the exhaust.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P02BF to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel System
Difficulty
Type
Generic (SAE)
Recommended Tools
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