What Does P02CF Mean?
The ECM has detected that Cylinder 2 fuel injector offset learning correction has reached its maximum allowable limit. The PCM is adding the maximum permissible fuel quantity to Cylinder 2, but the correction needed exceeds the adaptive range. This means Cylinder 2 is under-fueling relative to other cylinders, indicating a partially clogged or restricted injector, or a mechanical condition reducing fuel delivery.
Common Causes
40%
Partially clogged or restricted Cylinder 2 fuel injector with reduced flow rate from internal deposits or debris
25%
Faulty Cylinder 2 fuel injector with weak or failing solenoid coil reducing pintle lift and fuel delivery
20%
Low fuel rail pressure from weak fuel pump or partially clogged fuel filter disproportionately affecting Cylinder 2
15%
Intake manifold vacuum leak near Cylinder 2 runner causing lean condition that offsets the injector learning
Diagnostic Steps
1
Step 1: Review all cylinder injector offset learning values. A significantly positive offset on Cylinder 2 confirms under-fueling. Compare against other cylinders to isolate the issue.
2
Step 2: Perform an injector flow bench test or use an injector pulse width comparison test to verify Cylinder 2 injector flow rate matches other cylinders within 5% tolerance.
3
Step 3: Swap the Cylinder 2 injector with an adjacent cylinder, clear adaptations, and perform a relearn cycle. If the lean condition follows the injector, replace it or perform professional ultrasonic cleaning.
4
Step 4: Inspect the intake manifold area around Cylinder 2 for vacuum leaks using a smoke machine or propane enrichment test. Check intake runner gaskets and any vacuum hose connections near Cylinder 2.
5
Step 5: Measure fuel rail pressure under load and at idle. Verify the fuel pump delivers adequate volume (minimum 0.5 gallons per minute for most applications) and pressure holds steady under wide-open throttle.
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
The ECM has detected that Cylinder 2 fuel injector offset learning correction has reached its maximum allowable limit. The PCM is adding the maximum permissible fuel quantity to Cylinder 2, but the correction needed exceeds the adaptive range. This means Cylinder 2 is under-fueling relative to other...
The most common cause of P02CF (Cylinder 2 Fuel Injector Offset Learning At Max Limit) is: Partially clogged or restricted Cylinder 2 fuel injector with reduced flow rate from internal deposits or debris
Typical repair costs for P02CF range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Under-fueling Cylinder 2 causes a lean misfire condition that increases exhaust temperatures, potentially damaging the catalytic converter and causing noticeable drivability issues such as rough idle and hesitation.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P02CF 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.
