Cylinder 8 Injector Circuit Range/Performance
The P02F5 code indicates that the Engine Control Module (ECM) has detected a malfunction in the electrical circuit of the fuel injector for cylinder 8. This could be due to an open or short circuit, high resistance, or a performance issue such as the injector not opening or closing properly. The ECM monitors the injector circuit for expected voltage and current patterns; when these fall outside the specified range, the code is set. This can lead to reduced engine performance, misfires, and increased emissions.
01. Most Common Causes
- Faulty fuel injector on cylinder 8
- Open or shorted wiring in the injector circuit
- Poor electrical connection at the injector or ECM
- Failed ECM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire on cylinder 8
- Rough idle or hesitation
- Decreased fuel economy
- Possible engine knocking or pinging
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for additional codes.
Step 2: Visually inspect the injector wiring and connector for damage or corrosion.
Step 3: Measure resistance of cylinder 8 injector and compare to specifications (typically 12-16 ohms).
Step 4: Perform a injector balance test or power balance test to isolate the faulty injector.
Step 5: Check for voltage and ground signals at the injector connector with a multimeter or oscilloscope.
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 other components. Short trips to a repair shop are acceptable.
How much does it cost to fix?▼
The cost typically ranges from $150 to $400, including parts and labor. A single injector replacement is around $100-$200, plus diagnostic time.