Cylinder 8 Injector Restricted
The P02B8 code indicates that the Engine Control Module (ECM) has detected a restriction in the fuel injector for cylinder 8. 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 circuit performance; when cylinder 8's contribution is out of range, this code sets. Restricted injectors can cause misfires, poor fuel economy, and increased emissions.
01. Most Common Causes
- Clogged fuel injector from debris or carbon buildup
- Faulty fuel injector (internal failure)
- Low fuel pressure or contaminated fuel
- Wiring or connector issues at injector 8
02. Symptoms You Will Notice
- Engine misfire on cylinder 8
- Rough idle or hesitation during acceleration
- Check Engine Light illuminated
- Decreased fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Perform a cylinder contribution test to confirm cylinder 8 is weak.
Step 3: Visually inspect injector 8 connector and wiring for damage.
Step 4: Use a noid light to test injector pulse; if no pulse, check circuit.
Step 5: Perform a fuel injector balance test or flow test to confirm restriction.
Step 6: Replace injector 8 if restricted and clear codes.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the misfire can damage the catalytic converter and cause poor performance. Short trips to a repair shop are acceptable.
How much does it cost to fix?▼
Replacing a single fuel injector typically costs $150-$400 including parts and labor. Diagnosis may add $50-$100.