Cylinder 2 Injector Circuit High
The P0265 code indicates that the Engine Control Module (ECM) has detected a high voltage or resistance in the electrical circuit of the fuel injector for cylinder 2. This typically means the injector driver circuit is shorted to voltage or the injector itself has high internal resistance. The ECM monitors the injector circuit for proper voltage and current; when the voltage is higher than expected, it sets this code. This can lead to poor fuel delivery, misfires, and reduced engine performance.
1. Most Common Causes
- Cylinder 2 fuel injector has high internal resistance or an internal open circuit
- Injector wiring shorted to battery voltage (B+)
- Injector connector corroded, oxidized, or with damaged pins
- Harness wiring damaged by chafing, heat, or rodents causing a short circuit
- Intermittent ECM/PCM failure (less common)
- High resistance in the injector ground circuit
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire or rough idle
- Reduced fuel economy and power
- Possible hesitation or stalling
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm P0265 and check for related codes.
Step 2: Visually inspect the injector wiring and connector for damage, corrosion, or shorts.
Step 3: Measure resistance of cylinder 2 injector; compare to spec (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 circuit test using a multimeter or oscilloscope to detect shorts or opens.
Step 6: If wiring and injector are good, test ECM output or replace ECM.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause misfires, catalytic converter damage, and poor performance. Short trips to a repair shop are acceptable.
How much does it cost to fix?▼
Costs range from $150 to $400 depending on the cause. Injector replacement is $200-$350, wiring repairs $100-$200, and ECM replacement $500-$1000.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.