What Does P02D9 Mean?
The ECM has detected that Cylinder 7 fuel injector offset learning correction has reached its maximum allowable limit. The PCM is adding maximum fuel to Cylinder 7 but the under-fueling exceeds the adaptive correction range. This V8-engine code indicates Cylinder 7 is delivering significantly less fuel than commanded, pointing to a restricted or failing injector.
Common Causes
40%
Partially clogged Cylinder 7 fuel injector with internal deposits or contaminants restricting fuel flow
25%
Degraded Cylinder 7 injector solenoid coil with increased winding resistance reducing valve lift and flow
20%
Low fuel system pressure from a failing fuel pump or restricted fuel supply line on the bank feeding Cylinder 7
15%
Vacuum leak at Cylinder 7 intake runner or manifold gasket area causing localized lean condition
Diagnostic Steps
1
Step 1: Review injector offset learning values for all eight cylinders. A strongly positive offset on Cylinder 7 confirms under-fueling relative to the rest.
2
Step 2: Perform an injector flow bench test to compare Cylinder 7 output to the other injectors. Flow rate should be within 5% of the set average.
3
Step 3: Swap Cylinder 7 injector with another cylinder on the same bank, clear all adaptations, and perform a relearn drive cycle to isolate the fault to the injector or position.
4
Step 4: Smoke test the intake manifold area around Cylinder 7. On V8 engines, rear cylinders often have harder-to-detect leaks at the manifold-to-head gasket sealing surface.
5
Step 5: Verify fuel pump pressure and volume delivery to the fuel rail. Check for restrictions in fuel lines, especially on vehicles with long fuel rail runs to rear cylinders.
Estimated Repair Cost
$150 - $700
Parts + labor, varies by vehicle and location
The ECM has detected that Cylinder 7 fuel injector offset learning correction has reached its maximum allowable limit. The PCM is adding maximum fuel to Cylinder 7 but the under-fueling exceeds the adaptive correction range. This V8-engine code indicates Cylinder 7 is delivering significantly less f...
The most common cause of P02D9 (Cylinder 7 Fuel Injector Offset Learning At Max Limit) is: Partially clogged Cylinder 7 fuel injector with internal deposits or contaminants restricting fuel flow
Typical repair costs for P02D9 range from $150 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Under-fueling on Cylinder 7 causes lean misfires that elevate exhaust temperatures, potentially overheating the catalytic converter and causing engine roughness and power loss.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P02D9 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Fuel Injection System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
