Cylinder 11 Injector Restricted
The P02C4 code indicates that the engine control module (ECM) has detected a restriction in the fuel injector for cylinder 11. This means the injector is not delivering the proper amount of fuel, often due to clogging or internal damage. The ECM monitors fuel trim and injector performance; when it sees a deviation beyond a threshold, it sets this code. This can lead to misfires, reduced power, and increased emissions.
1. Most Common Causes
- Clogged fuel injector due to carbon deposits or contaminants
- Clogged fuel filter restricting flow to the fuel rail
- Fuel pump delivering insufficient pressure
- Faulty injection rail control valve (IMRC/IMRC runner)
- High resistance or poor connection in cylinder 11 injector wiring
- Internal injector defect (stuck solenoid valve or degraded coil)
- Contaminated or low-quality fuel
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire or rough idle
- Reduced engine power and acceleration
- Poor fuel economy
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Perform a fuel injector balance test to compare cylinder 11 to others.
Step 3: Inspect injector wiring and connector for damage or corrosion.
Step 4: Check fuel pressure and quality; replace fuel filter if needed.
Step 5: If injector is confirmed restricted, replace it.
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. Have it diagnosed promptly.
How much does it cost to fix?▼
Replacing a single fuel injector typically costs $50-$150 for parts and labor, but diagnostic fees may add $50-$100.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.