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; a restriction causes lean conditions and misfires.
01. Most Common Causes
- Clogged fuel injector from debris or carbon buildup
- Faulty fuel injector (internal failure)
- Contaminated fuel (water, dirt)
- Low fuel pressure or failing fuel pump
02. Symptoms You Will Notice
- Check Engine Light on
- Engine misfire or rough idle
- Poor acceleration and reduced power
- Increased fuel consumption
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Perform a fuel injector balance test using a scan tool.
Step 3: Inspect fuel injector electrical connector and wiring.
Step 4: Check fuel pressure and fuel quality.
Step 5: Remove and test injector flow or replace if restricted.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with a restricted injector can cause misfires, catalytic converter damage, and poor engine performance. Have it diagnosed promptly.
How much does it cost to fix?▼
Costs range from $50 to $150 for a single injector replacement, plus labor. Diagnosis may add $100-$200.