What Does P02DF Mean?
The ECM has detected that Cylinder 10 fuel injector offset learning correction has reached its maximum allowable limit. The PCM is adding maximum fuel to Cylinder 10 but cannot compensate for the under-fueling condition. Applicable to V10 and V12 engines, Cylinder 10 is delivering significantly less fuel than commanded, typically due to a restricted or failing injector.
Common Causes
40%
Partially clogged Cylinder 10 fuel injector with internal deposits or debris restricting fuel flow below the adaptive correction range
25%
Failing Cylinder 10 injector solenoid with increased coil resistance causing reduced pintle travel and fuel delivery
20%
Low fuel system pressure on the bank feeding Cylinder 10 from a degraded fuel pump or restricted supply components
15%
Vacuum leak at Cylinder 10 intake runner or manifold gasket causing unmetered air entry and localized lean running
Diagnostic Steps
1
Step 1: Retrieve all cylinder injector offset learning values. Confirm Cylinder 10 has the most positive offset, indicating the ECM is adding maximum fuel to compensate for under-delivery.
2
Step 2: Perform an injector flow bench test comparing Cylinder 10 to the rest of the injector set. Flow should be within 5% of the group average.
3
Step 3: Swap Cylinder 10 injector with another cylinder on the same bank, clear adaptations, and complete a relearn cycle. If the lean fault follows the injector, replace or clean it.
4
Step 4: Smoke test the intake manifold around Cylinder 10 for vacuum leaks, especially at the runner-to-head gasket surface and any vacuum connections in the area.
5
Step 5: Verify fuel pump pressure and volume at the fuel rail under idle and wide-open throttle conditions to ensure adequate delivery to all cylinders.
Estimated Repair Cost
$200 - $750
Parts + labor, varies by vehicle and location
The ECM has detected that Cylinder 10 fuel injector offset learning correction has reached its maximum allowable limit. The PCM is adding maximum fuel to Cylinder 10 but cannot compensate for the under-fueling condition. Applicable to V10 and V12 engines, Cylinder 10 is delivering significantly less...
The most common cause of P02DF (Cylinder 10 Fuel Injector Offset Learning At Max Limit) is: Partially clogged Cylinder 10 fuel injector with internal deposits or debris restricting fuel flow below the adaptive correction range
Typical repair costs for P02DF range from $200 to $750, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Under-fueling on Cylinder 10 causes lean misfires, elevated exhaust temperatures, and potential catalytic converter damage. The engine may exhibit rough running and reduced power output.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P02DF to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel Injection System
Difficulty
Type
Generic (SAE)
Recommended Tools
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