Cylinder 5 Injector Circuit High
The P0274 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 5. This typically means the injector circuit is open, shorted to voltage, or the injector itself has high internal resistance. The ECM monitors the injector driver circuit for proper voltage and current flow; when the voltage is higher than expected, it sets this code. Common causes include a faulty injector, damaged wiring, or a poor connection.
1. Most Common Causes
- Faulty fuel injector on cylinder 5
- Open or shorted wiring in the injector circuit
- Corroded or loose connector at the injector
- Failed ECM (rare)
2. Symptoms You Will Notice
- Engine misfire on cylinder 5
- Rough idle and poor acceleration
- Check Engine Light illuminated
- Decreased fuel economy
3. Step-by-Step Diagnosis
Step 1: Scan for codes and note freeze frame data.
Step 2: Visually inspect the injector connector and wiring for damage or corrosion.
Step 3: Measure resistance of cylinder 5 injector; compare to specification (typically 12-16 ohms).
Step 4: Check for voltage at the injector connector with key on; should see battery voltage on one pin.
Step 5: Perform a injector balance test or swap injectors to isolate the issue.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive for 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?▼
The cost typically ranges from $150 to $400, including parts and labor. A single injector replacement is around $100-$200, plus diagnostic time.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.