What Does P02DC Mean?
The ECM has detected that Cylinder 9 fuel injector offset learning correction has reached its minimum allowable limit. The adaptive fuel strategy is subtracting the maximum fuel from Cylinder 9 but the over-fueling condition exceeds the correction range. This code applies to V10 and V12 engines, indicating Cylinder 9 is delivering significantly more fuel than commanded.
Common Causes
40%
Leaking or stuck-open Cylinder 9 fuel injector delivering excess fuel beyond the ECM adaptive correction range
25%
Incorrect or mismatched replacement injector installed in Cylinder 9 with a higher flow rate than the factory set
20%
Elevated fuel rail pressure from a faulty pressure regulator affecting the bank feeding Cylinder 9
15%
Carbon buildup on Cylinder 9 injector tip altering spray characteristics and increasing net fuel delivery
Diagnostic Steps
1
Step 1: Retrieve injector offset learning values for all cylinders. Confirm Cylinder 9 has the most negative offset, indicating the ECM is maximally reducing fuel delivery to that cylinder.
2
Step 2: Monitor per-cylinder fuel contribution at idle and 2500 RPM. On V10 engines, compare Cylinder 9 against other cylinders on the same bank for bank-specific issues.
3
Step 3: Swap Cylinder 9 injector with an adjacent cylinder on the same fuel rail, clear adaptive values, and complete a relearn drive cycle to isolate the injector from the position.
4
Step 4: Verify fuel rail pressure on the bank feeding Cylinder 9 using a mechanical gauge. Compare to specification and check for regulator leakage.
5
Step 5: If the injector tests within flow specification, perform a compression and leak-down test on Cylinder 9 to identify mechanical conditions affecting combustion and biasing offset learning.
Estimated Repair Cost
$200 - $750
Parts + labor, varies by vehicle and location
The ECM has detected that Cylinder 9 fuel injector offset learning correction has reached its minimum allowable limit. The adaptive fuel strategy is subtracting the maximum fuel from Cylinder 9 but the over-fueling condition exceeds the correction range. This code applies to V10 and V12 engines, ind...
The most common cause of P02DC (Cylinder 9 Fuel Injector Offset Learning At Min Limit) is: Leaking or stuck-open Cylinder 9 fuel injector delivering excess fuel beyond the ECM adaptive correction range
Typical repair costs for P02DC range from $200 to $750, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Over-fueling Cylinder 9 on a V10/V12 engine can cause catalytic converter damage from excess unburned hydrocarbons, cylinder wall washing, and elevated emissions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P02DC to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel Injection System
Difficulty
Type
Generic (SAE)
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