High Pressure Fuel Pump Calibration Not Learned
The P268B code indicates that the Engine Control Module (ECM) has not completed the calibration learning process for the high-pressure fuel pump. This typically occurs after replacing the pump, ECM, or battery, or after a software update. The pump's internal sensors must be calibrated to ensure correct fuel pressure delivery; without it, the engine may run poorly or fail to start.
01. Most Common Causes
- High-pressure fuel pump replacement without performing calibration
- ECM replacement or software update that resets learned values
- Battery disconnection or low voltage interrupting the learning process
- Faulty high-pressure fuel pump or sensor
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine hard to start or no start
- Rough idle or misfire
- Reduced engine power or limp mode
03. Step-by-Step Diagnosis
Step 1: Connect a scan tool and verify the P268B code and any related codes.
Step 2: Check the fuel pressure with a gauge to ensure the pump is mechanically functioning.
Step 3: Perform the high-pressure fuel pump calibration procedure using a professional scan tool (e.g., following manufacturer-specific steps like key cycle or scan tool command).
Step 4: Clear the code and test drive to confirm the calibration was learned.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The vehicle may experience poor performance, stalling, or failure to start, which could be dangerous in traffic.
How much does it cost to fix?▼
If the pump is functional, the calibration procedure typically costs $50-$150 at a shop. If the pump needs replacement, costs can exceed $500.