Cylinder 9 Injector Circuit Range/Performance
The P02F6 code indicates that the Engine Control Module (ECM) has detected a malfunction in the electrical circuit or performance of the fuel injector for cylinder 9. This can be due to an open or short circuit, high resistance, or a faulty injector driver. The ECM monitors the injector circuit for proper voltage and current flow; when the readings fall outside the expected range, this code is set. Common causes include a defective injector, wiring issues, or a failing ECM.
01. Most Common Causes
- Faulty fuel injector on cylinder 9
- Open or shorted wiring in the injector circuit
- Corroded or damaged connector at the injector
- Failed ECM or injector driver
02. Symptoms You Will Notice
- Engine misfire on cylinder 9
- Rough idle or hesitation
- Check Engine Light illuminated
- Decreased fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data.
Step 2: Visually inspect the injector connector and wiring for damage or corrosion.
Step 3: Measure resistance of cylinder 9 injector and compare to specifications (typically 12-16 ohms).
Step 4: Use a noid light or oscilloscope to test injector pulse from ECM.
Step 5: Swap injector with another cylinder to see if code moves.
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 it can cause engine misfire, catalytic converter damage, and reduced performance. Have it diagnosed promptly.
How much does it cost to fix?▼
Costs range from $150 to $400 depending on the cause. Injector replacement is typically $200-$300, while wiring repairs may be less.