Cylinder 3 Injector Circuit High
The P0268 code indicates that the powertrain control module (PCM) has detected a high voltage or resistance in the electrical circuit for the fuel injector on cylinder 3. This typically means the injector driver circuit is seeing higher than normal voltage, which can be caused by a short to power, a faulty injector, or wiring issues. The PCM monitors the injector circuit for proper voltage and current; when the voltage is too high, it sets this code to alert the driver of a potential problem that can affect engine performance and fuel economy.
01. Most Common Causes
- Short to voltage in the injector wiring harness
- Faulty fuel injector on cylinder 3
- Corroded or damaged connector at the injector
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire or rough idle
- Poor fuel economy
- Reduced engine power
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the injector wiring and connector for damage or corrosion.
Step 3: Measure resistance of cylinder 3 injector and compare to specification (typically 12-16 ohms).
Step 4: Check for voltage at the injector connector with key on; should be battery voltage on one pin.
Step 5: Perform a injector balance test or swap injectors to isolate the issue.
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 engine misfire, catalytic converter damage, and poor performance. Have it diagnosed promptly.
How much does it cost to fix?▼
Repair costs vary: injector replacement $150-$400, wiring repair $100-$300, PCM replacement $500-$1000. Diagnosis fee is typically $100-$150.