Fuel Injector Calibration Not Learned
The P268A code indicates that the Engine Control Module (ECM) has not completed the learning process for the fuel injector calibration values. Modern engines require precise fuel delivery, and each injector has unique flow characteristics stored in the ECM. If the calibration is not learned, the ECM cannot compensate for injector variations, leading to potential drivability issues. This often occurs after replacing injectors, an ECM, or after a battery disconnect without performing the required relearn procedure.
01. Most Common Causes
- Fuel injectors replaced without performing calibration relearn
- ECM replacement or reprogramming without injector calibration
- Battery disconnection or low voltage interrupting the learning process
- Faulty fuel injector with incorrect calibration data
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or misfire
- Poor fuel economy
- Reduced engine performance
03. Step-by-Step Diagnosis
Step 1: Connect a scan tool and retrieve all stored codes and freeze frame data.
Step 2: Perform the fuel injector calibration relearn procedure using a professional scan tool (e.g., bidirectional control).
Step 3: If the code returns, inspect the fuel injector wiring and connectors for damage or corrosion.
Step 4: Verify the fuel injector part numbers match the vehicle specifications and that they are properly installed.
Step 5: If necessary, replace the fuel injector(s) and repeat the calibration relearn.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause rough running, poor fuel economy, and potential damage to the catalytic converter due to unburned fuel.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for a diagnostic and calibration relearn at a shop. If injector replacement is needed, costs increase significantly.