How To Clear Codes On Harley Davidson

Knowing how to clear diagnostic trouble codes (DTCs) on your Harley-Davidson can save you time and money. Instead of immediately heading to the dealership for every minor issue, you can troubleshoot and potentially resolve the problem yourself. This knowledge is particularly valuable if you're a daily rider, a weekend warrior, or someone who relies on their bike for commuting.

Clearing Codes: The Basic Procedure

The exact method can vary slightly depending on the Harley-Davidson model and year, but the general process remains consistent. The most common method involves using the bike's odometer reset button and the ignition switch.

Step 1: Turn the Ignition Switch Off. Ensure the ignition switch is in the "OFF" position. This is crucial for resetting the system properly. Remove the key for added safety.

Step 2: Depress and Hold the Odometer Reset Button. Locate the odometer reset button on your instrument panel. Press and hold it down throughout the next steps.

Step 3: Turn the Ignition Switch On. While still holding the odometer reset button, turn the ignition switch to the "ON" position. Do not start the engine. Simply turn the key far enough to power on the instrument panel.

Step 4: Observe the Diagnostic Menu. Keep holding the odometer reset button. After a few seconds, the odometer display will change and cycle through different modules. Common modules you might see include:

• P: ECM/PCM (Engine Control Module/Powertrain Control Module)
• S: TSSM/HSM (Turn Signal Security Module/Hands-Free Security Module)
• SP: Speedometer
• t: Tachometer (if equipped)
• b: ABS (Anti-lock Braking System, if equipped)
• r: Radio (if equipped)

Continue holding the button until you see the module you want to clear the codes from. For example, if you want to clear engine codes, wait until "P" is displayed.

Step 5: Enter the Diagnostic Mode. Once the desired module is displayed, release the odometer reset button briefly (for a second or two) and then press and hold it down again immediately.

Step 6: View the Codes. The display will now show any stored DTCs for that module. The codes are typically alphanumeric, like "P0123" or "b1122". Write down these codes before clearing them – they can be helpful for future troubleshooting.

Step 7: Clear the Codes. While the DTC is displayed, press and hold the odometer reset button down again. After a few seconds, the display should change to "Clr" or "Clear". Release the button. This indicates that the codes have been cleared from that module.

Step 8: Confirm the Clear. Turn the ignition switch off and then back on (without holding the odometer reset button this time) to verify that the codes have been cleared. Check the diagnostic mode again to ensure the module shows "no rSP" or a similar message indicating no stored codes.

Step 9: Repeat for Other Modules (if necessary). If you need to clear codes from other modules (e.g., the TSSM/HSM or ABS), repeat steps 4 through 8 for each module individually.

Troubleshooting Common Issues

Sometimes, the procedure doesn't work as expected. Here are a few things to check:

• Button Functionality: Ensure the odometer reset button is functioning correctly. If it's sticky or unresponsive, it might need cleaning or replacement.
• Power Supply: Make sure your battery has sufficient charge. A low battery can sometimes interfere with the diagnostic system.
• Timing: The timing of releasing and pressing the odometer reset button is crucial. Practice the sequence to get the timing right.
• Module Availability: Not all modules may be present on every Harley-Davidson model. If you don't see a particular module, it might not be equipped on your bike.

When to Clear Codes (and When Not To)

Clearing codes can be helpful in several situations:

• After Repairing an Issue: Once you've fixed a problem that triggered a DTC, clearing the code confirms that the repair was successful and resets the warning light.
• Troubleshooting Intermittent Issues: If you experience an occasional fault, clearing the code allows you to see if the problem recurs. If it doesn't, it might have been a temporary glitch.

However, there are times when you should not clear codes immediately:

• Before Diagnosis: Don't clear codes before you've had a chance to investigate the underlying problem. The DTCs provide valuable information for diagnosing the issue.
• If the Problem Persists: If the warning light comes back on immediately after clearing the code, the problem is still present. Clearing the code won't fix the underlying issue and might mask a more serious problem.
• Before a Mechanic Sees It: If you're taking your bike to a mechanic, leave the codes intact. They can use the information to diagnose the problem more efficiently.

Using a Diagnostic Scan Tool

While the odometer reset button method works for many basic functions, a dedicated diagnostic scan tool offers more advanced capabilities. These tools plug into your bike's diagnostic port (usually located under the seat or side panel) and provide a wealth of information, including:

• Detailed DTC Descriptions: Scan tools provide more specific descriptions of the DTCs than the abbreviated codes displayed on the odometer.
• Live Data Monitoring: You can monitor real-time data from sensors and modules, which is invaluable for troubleshooting performance issues.
• Advanced Diagnostic Functions: Some scan tools offer features like actuator testing and system reprogramming.

A basic scan tool can be purchased for a reasonable price and can pay for itself over time by saving you trips to the dealership. Higher-end scan tools offer even more features, but they come at a higher cost.

Using a scan tool typically involves connecting the tool to the diagnostic port, turning on the ignition switch, and following the on-screen prompts to read and clear codes. The exact procedure will vary depending on the tool you're using.

Tip: Before purchasing a scan tool, ensure it's compatible with your Harley-Davidson model and year. Check the manufacturer's website or consult with a knowledgeable retailer.

Practical Applications in Daily Life/Work

Understanding how to clear codes and interpret DTCs is practical for several reasons:

• Reduced Maintenance Costs: By diagnosing and resolving minor issues yourself, you can avoid unnecessary trips to the dealership and save on labor costs.
• Improved Uptime: Being able to quickly clear codes and identify potential problems can help you keep your bike on the road and avoid unexpected breakdowns. This is especially important if you rely on your bike for commuting or work.
• Enhanced Troubleshooting Skills: The process of diagnosing and clearing codes can improve your overall understanding of your bike's systems and enhance your troubleshooting skills.
• Informed Decision-Making: Knowing the DTCs allows you to have a more informed conversation with your mechanic if you do need to take your bike in for service. You can provide them with specific information about the problem, which can speed up the repair process.

Checklist/Guideline for Clearing Harley-Davidson Codes

1. Preparation:
   • Locate your bike's diagnostic port (if using a scan tool).
   • Gather necessary tools (odometer reset button or scan tool).
   • Ensure your battery is fully charged.
2. Procedure:
   • Use the odometer reset button method or a diagnostic scan tool.
   • Follow the specific steps outlined for your chosen method.
   • Write down any DTCs before clearing them.
3. Verification:
   • Confirm that the codes have been cleared successfully.
   • Monitor for the reappearance of any warning lights.
4. Troubleshooting:
   • If the procedure doesn't work, check button functionality, power supply, and timing.
   • Consult your owner's manual or a service manual for specific instructions for your model.
5. Post-Clearing:
   • If the problem persists, seek professional assistance from a qualified mechanic.
   • Keep a record of any DTCs and repairs for future reference.