Cylinder 7 Injector Circuit High
The P0280 code indicates that the Engine Control Module (ECM) has detected a high voltage or resistance in the electrical circuit of the fuel injector for cylinder 7. This typically means the injector circuit is open or shorted to a high voltage source, preventing proper injector operation. Common causes include a faulty injector, damaged wiring, or a poor electrical connection.
01. Most Common Causes
- Faulty fuel injector on cylinder 7
- Open or shorted wiring in injector circuit
- Corroded or loose connector at injector
- Failed ECM (rare)
02. Symptoms You Will Notice
- Engine misfire on cylinder 7
- Rough idle or hesitation
- Check Engine Light illuminated
- Decreased fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and verify P0280 is present.
Step 2: Inspect the injector connector and wiring for damage or corrosion.
Step 3: Measure resistance of injector 7; compare to spec (typically 12-16 ohms).
Step 4: Check for voltage at injector connector with key on; should be battery voltage.
Step 5: Perform a injector balance test or swap injector to see if code follows.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can cause engine misfire, reduced performance, and potential damage to the catalytic converter.
How much does it cost to fix?▼
The cost typically ranges from $150 to $400, including parts and labor, depending on whether the injector or wiring needs replacement.