Encountering a “No Routing” message when you connect your OBD2 scanner to your vehicle can be frustrating. It means your scanner is unable to establish a communication pathway with your car’s computer system. This issue prevents you from reading diagnostic trouble codes, checking engine data, or performing other helpful scans. But don’t worry, this is a fairly common problem, and in many cases, you can troubleshoot and resolve it yourself. This guide will walk you through the steps to diagnose and fix the “no routing” error, getting you back to understanding your vehicle’s health.
Understanding the “No Routing” Error
The “No Routing” error essentially indicates a breakdown in communication between your OBD2 scanner and your vehicle’s Engine Control Unit (ECU) or other relevant modules. Think of it like a phone line that’s been cut – the message can’t get through. Several factors can contribute to this communication failure, ranging from simple connection problems to more complex vehicle issues.
Common causes for a “No Routing” error include:
- Loose or Incorrect Connection: The most frequent culprit is simply a poor physical connection between the scanner and the OBD2 port.
- OBD2 Scanner Incompatibility: Not all scanners are compatible with all vehicles. Your scanner might not support the communication protocols used by your car.
- Faulty OBD2 Port: The OBD2 port in your vehicle could be damaged, corroded, or have bent pins, preventing proper connection.
- Scanner Malfunction: Although less common, the OBD2 scanner itself might be faulty or have software glitches.
- Vehicle Communication System Issues: In rarer cases, the problem might lie within your vehicle’s communication network (like the CAN bus), preventing any external device from connecting.
- Software or App Glitches: If you are using a smartphone app or PC software with your OBD2 scanner, the issue could be with the software itself.
Troubleshooting Steps: Fixing the “No Routing” Error
Let’s systematically go through the troubleshooting steps to pinpoint and resolve the “No Routing” error.
1. Check the OBD2 Port
The first and easiest step is to inspect your vehicle’s OBD2 port. It’s typically located under the dashboard on the driver’s side.
- Location: Make sure you are connecting to the correct OBD2 port. Refer to your vehicle’s owner’s manual if you are unsure of its exact location.
- Visual Inspection: Look for any signs of damage, dirt, debris, or corrosion inside the port. Carefully check for bent or pushed-in pins.
- Clean the Port: If you see dirt or debris, gently try to clean the port using compressed air or a soft brush. Be very careful not to damage the pins.
2. Verify Scanner Compatibility
Scanner compatibility is crucial. Ensure your OBD2 scanner is designed to work with your vehicle’s make, model, and year.
- Check Scanner Specifications: Review the scanner’s product manual or online specifications to confirm compatibility with your vehicle’s year, make, and model.
- Protocol Support: OBD2 communication relies on various protocols (like CAN, ISO, PWM, VPW). Ensure your scanner supports the protocols used by your vehicle. Most modern vehicles use CAN (Controller Area Network).
- Software Updates: If your scanner requires software, check if there are any updates available. Outdated software can sometimes cause communication issues.
3. Ensure a Secure Connection
A loose connection is a common cause of “No Routing.”
- Firmly Insert the Scanner: Plug the OBD2 scanner firmly into the port, ensuring it’s fully seated and snug. You should typically feel a click or resistance when it’s properly connected.
- Wiggle Test: Gently wiggle the scanner connection to see if it loses connection intermittently. If the “No Routing” message flickers or changes when you wiggle it, it indicates a loose connection. Try reconnecting firmly.
- Check Adapter Cables (if used): If you are using any adapter cables or extension cords between the scanner and the OBD2 port, ensure they are also securely connected and not faulty.
4. Try a Different OBD2 App or Software
If you’re using a smartphone app or computer software with your OBD2 scanner, the problem could be software-related.
- App/Software Glitches: Apps and software can sometimes have temporary glitches. Close and restart the app or software, and try reconnecting.
- Compatibility Issues: Ensure the app or software you are using is compatible with your OBD2 scanner and your vehicle’s operating system (Android, iOS, Windows, etc.).
- Try a Different App/Software: If possible, try using a different OBD2 app or software to see if the “No Routing” error persists. There are many free and paid OBD2 apps available for smartphones and computers.
5. Test with Another Vehicle (If Possible)
Testing your OBD2 scanner on a different vehicle can help isolate whether the problem is with the scanner itself or your vehicle.
- Connect to a Different Car: If you have access to another vehicle that is OBD2 compliant, try connecting your scanner to it.
- Successful Connection on Another Vehicle: If the scanner works correctly on another vehicle, it suggests the issue is likely with your original vehicle’s OBD2 port or communication system.
- “No Routing” on Multiple Vehicles: If the scanner still shows “No Routing” on other vehicles, it indicates a potential problem with the OBD2 scanner itself.
6. Check Vehicle’s Fuse Box
The OBD2 port is often powered by a fuse in your vehicle’s fuse box. A blown fuse can cut power to the port, preventing communication.
- Locate Fuse Box: Refer to your vehicle’s owner’s manual to find the location of the fuse box(es). There may be fuse boxes under the dashboard and in the engine compartment.
- Identify OBD2 Fuse: Consult your owner’s manual or fuse box diagram to identify the fuse that powers the OBD2 port or related systems (sometimes labeled as “diagnostic,” “accessory,” or “cigarette lighter” fuse).
- Inspect and Replace Fuse: Visually inspect the fuse for a broken filament. If it looks blown, replace it with a fuse of the same amperage rating.
7. Seek Professional Diagnostic Help
If you’ve tried all the above troubleshooting steps and still encounter the “No Routing” error, it’s time to seek professional help.
- Qualified Mechanic: Take your vehicle to a qualified mechanic or auto diagnostic specialist. They have advanced tools and expertise to diagnose complex vehicle communication issues.
- Professional Scan Tools: Mechanics use professional-grade scan tools that can perform more in-depth diagnostics and pinpoint the exact cause of the communication problem.
- Potential Vehicle Issues: A persistent “No Routing” error could indicate underlying problems in your vehicle’s wiring, ECU, or communication network that require professional diagnosis and repair.
Choosing the Right OBD2 Scanner
To avoid compatibility issues in the future, it’s important to choose an OBD2 scanner that is suitable for your vehicle and your needs.
- Vehicle Compatibility: Always check the scanner’s compatibility list or specifications to ensure it supports your vehicle’s make, model, and year.
- Features: Consider the features you need. Basic scanners read and clear codes, while more advanced scanners offer live data, sensor testing, and bidirectional control.
- Reviews and Ratings: Read reviews and ratings from other users to get an idea of the scanner’s reliability and performance.
- Budget: OBD2 scanners range in price from basic to professional levels. Choose one that fits your budget and provides the features you need.
Conclusion
Seeing “No Routing” when connecting your OBD2 scanner doesn’t have to be a roadblock. By systematically following these troubleshooting steps, you can often identify and fix the problem yourself. Remember to check the connection, verify compatibility, and rule out simple issues first. If the problem persists, don’t hesitate to seek professional help to ensure accurate diagnosis and repair of your vehicle’s diagnostic system. Understanding and addressing the “no routing” error empowers you to take control of your car’s maintenance and diagnostics.
