Cylinder 6 Injector Circuit High
The P0277 code indicates that the Engine Control Module (ECM) has detected a high voltage or resistance in the electrical circuit for the fuel injector on cylinder 6. This typically means the injector circuit is open or has excessive resistance, preventing proper injector operation. Common causes include a faulty injector, damaged wiring, poor connector contact, or a failing ECM driver.
01. Most Common Causes
- Faulty fuel injector on cylinder 6
- Open or shorted wiring in injector circuit
- Corroded or damaged connector at injector or ECM
- Failed ECM driver for cylinder 6 injector
02. Symptoms You Will Notice
- Engine misfire on cylinder 6
- Rough idle or hesitation
- Check Engine Light illuminated
- Decreased fuel economy and power
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect injector connector and wiring for damage.
Step 3: Measure resistance of cylinder 6 injector (typically 11-18 ohms).
Step 4: Check for voltage at injector connector with key on (should be battery voltage).
Step 5: Perform a continuity test between injector and ECM.
Step 6: Swap injector with another cylinder 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 long distances as it can cause catalytic converter damage from unburned fuel. Short trips to a repair shop are acceptable.
How much does it cost to fix?▼
Costs range from $150 to $400 depending on the cause. A single injector replacement is typically $200-$300, while wiring repairs are less expensive.