Cylinder 12 Injector Restricted
The P02C8 code indicates that the fuel injector for cylinder 12 is restricted, meaning it is not delivering the proper amount of fuel. This can be caused by carbon buildup, debris, or internal injector failure. The engine control module (ECM) detects a lean condition or misfire on that cylinder and sets this code.
1. Most Common Causes
- Clogged or carbonized fuel injector on cylinder 12
- Clogged fuel filter restricting fuel flow
- Fuel pump delivering insufficient pressure
- Faulty fuel rail pressure control valve (FRP/MPROP)
- Injector wiring with high resistance or poor connection
- Corroded or loose injector connector
- Engine control module (ECM/PCM) with internal injector driver failure
- Contaminated or low-quality fuel
2. Symptoms You Will Notice
- Engine misfire on cylinder 12
- Rough idle or hesitation
- Check Engine Light illuminated
- Reduced fuel economy
3. Step-by-Step Diagnosis
Step 1: Scan for codes and verify P02C8 is present.
Step 2: Perform a cylinder power balance test to confirm cylinder 12 misfire.
Step 3: Inspect fuel injector connector and wiring for damage.
Step 4: Use a noid light to check injector pulse signal.
Step 5: Remove injector and test flow/pattern; clean or replace if restricted.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause catalytic converter damage and poor performance.
How much does it cost to fix?▼
Cleaning the injector costs around $50-$100, while replacement can be $100-$150 per injector plus labor.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.