OBD-II Network Error Code U0109: How to Fix It

Q: Can I drive my car with error code U0109?

You should avoid driving with this code as it indicates lost communication with the fuel pump control module. This can cause sudden loss of fuel pressure, engine stalling, or complete shutdown while driving, creating a dangerous situation.

Q: What causes OBD-II error code U0109?

Common causes include blown fuel pump fuse, faulty fuel pump relay, damaged wiring harness, corroded electrical connections, failed fuel pump control module, or poor ground connections in the fuel pump circuit.

Q: How much does it cost to fix error code U0109?

Costs vary widely depending on the root cause. A simple fuse replacement costs under $10, while a fuel pump control module replacement can range from $200-800 including labor. Most repairs fall in the $150-400 range.

Q: Will error code U0109 clear itself?

No, this code will not clear itself. It indicates an active communication problem that requires physical repair. The code will persist until the underlying electrical issue is resolved and manually cleared with an OBD-II scanner.

Q: Is error code U0109 covered under warranty?

Coverage depends on your vehicle's age and warranty terms. Fuel system electrical components are typically covered under powertrain warranty for newer vehicles. Check with your dealer if your car is less than 8 years old or has under 100,000 miles.

Abstract

OBD-II error code U0109 indicates that your vehicle's main computer has lost communication with the fuel pump control module. This serious issue can cause poor fuel delivery, rough running, or complete engine shutdown and requires immediate attention.