Cylinder 1 Injector Data Incompatible
The P268C code indicates that the Engine Control Module (ECM) has detected a mismatch between the expected and actual data from the fuel injector on cylinder 1. This typically occurs when the injector's electrical characteristics (such as resistance or response time) fall outside the programmed range, often due to a faulty injector, wiring issues, or a corrupted injector calibration in the ECM. The system uses injector coding to fine-tune fuel delivery, and any incompatibility can lead to poor engine performance, misfires, and increased emissions.
01. Most Common Causes
- Faulty cylinder 1 fuel injector
- Damaged or corroded injector wiring/connector
- ECM software or calibration error
- Injector coding not performed after replacement
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire or rough idle
- Reduced fuel economy
- Hesitation or lack of power during acceleration
03. Step-by-Step Diagnosis
Step 1: Scan the ECM for all codes and freeze frame data to confirm P268C and check for related codes.
Step 2: Visually inspect the injector wiring and connector at cylinder 1 for damage, corrosion, or loose pins.
Step 3: Measure injector resistance with a multimeter and compare to manufacturer specifications (typically 12-17 ohms).
Step 4: If resistance is out of spec, replace the injector and perform injector coding/calibration using a scan tool.
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 the misfire can cause catalytic converter damage and poor drivability. Short trips to a repair shop are acceptable.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and injector replacement, plus parts. Injector coding may add $50-$100 if required.