Cylinder 2 Injector Circuit Low
The P0264 code indicates that the Engine Control Module (ECM) has detected a low voltage or current condition in the electrical circuit for the fuel injector on cylinder 2. This typically means the injector circuit has higher than normal resistance, a short to ground, or an open circuit. The ECM monitors the injector driver circuit and sets this code when the voltage or current is below the expected threshold, often due to a faulty injector, wiring issues, or a problem with the ECM itself.
01. Most Common Causes
- Faulty fuel injector on cylinder 2 (internal short or open coil)
- Open or shorted wiring in the injector circuit (harness damage, corrosion)
- Poor electrical connection at the injector or ECM connector
- Failed ECM (rare)
02. Symptoms You Will Notice
- Engine misfire on cylinder 2
- Rough idle or hesitation during acceleration
- Check Engine Light illuminated
- Decreased fuel economy and performance
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm P0264 and check for related codes (e.g., P0202 for injector circuit malfunction).
Step 2: Visually inspect the injector wiring and connector for cylinder 2 for damage, corrosion, or loose pins.
Step 3: Measure resistance of the injector (typically 11-18 ohms for most vehicles). Compare to a known good injector.
Step 4: Perform a voltage drop test on the injector circuit to check for excessive resistance.
Step 5: If wiring and injector are okay, test the ECM output by swapping injectors or using a noid light to check for pulse.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with P0264 as it can cause engine misfire, reduced performance, and potential damage to the catalytic converter due to unburned fuel.
How much does it cost to fix?▼
The cost typically ranges from $150 to $400, including parts and labor. A single fuel injector replacement costs $50-$150, plus diagnostic time and labor.