When it comes to Harley Davidson motorcycles, having knowledge about diagnostic codes is more than just a beneficial skill—it’s a necessity. As every seasoned rider understands, these bikes are an intricate fusion of dynamic design and power-packed machinery, and hence, they require meticulous monitoring. The key to that? Harley Davidson diagnostic codes.

They are the language that your Harley uses to speak to you, alerting you when something goes awry or needs attention, and enabling you to respond appropriately. Decoding the encrypted messages that your bike throws up keeps it performing at its peak and extends its life. This comprehensive manual unlocks the secret language of your Harley.

Whether you’re a lifelong Harley owner or a recent enthusiast, understanding these diagnostic codes is an essential part of your ride’s journey. After all, keeping the spirit of freedom alive on the open road means ensuring your Harley is always ready to roar. Are you? let’s keep moving.

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How To Read Harley Check Codes

Reading Harley Davidson check codes, also known as Diagnostic Trouble Codes (DTCs), is a straightforward process that can be done without the need for specialized tools. These codes provide vital information about the health of your motorcycle, alerting you to any issues that need attention. Here’s a step-by-step guide on how to read them:

1. Turn the Ignition to On: Begin by turning the ignition switch to the “On” position without starting the engine. This powers up the motorcycle’s electrical systems, including the diagnostics system.
2. Access Diagnostics Mode: On most Harley models, you can enter the diagnostics mode by pressing and holding the odometer reset button. While holding the button, turn the ignition switch to the “On” position.
3. Release and Read Codes: After a few seconds, release the odometer reset button. The instrument panel will enter the diagnostics mode. The first thing you’ll typically see is the speedometer needle performing a full sweep. Then, the display will show the current and historic codes.
4. Interpreting Codes: The codes usually consist of a letter followed by a four-digit number (e.g., P0261). The letter indicates the system involved (P for Powertrain, B for Body, C for Chassis, U for Network). Refer to your Harley Davidson manual for specific code meanings.
5. Cycle Through Codes: You can cycle through the codes using the odometer reset button. Pay attention to both current and historic codes, as they can provide valuable insights into intermittent issues.
6. End Diagnostics Session: Once you have noted down all the codes, you can exit the diagnostics mode by turning the ignition switch to the “Off” position.

Harley Davidson Code List (Most Common)

Harley Davidson motorcycles come equipped with a diagnostic system that alerts you of issues with the bike. The system uses specific DTCs to indicate different issues, each represented by a unique alphanumeric code.

Table 1: Common Harley Davidson DTCs

Code	Problem
P0562	Battery/ECM Voltage Low
P1356	Rear Cylinder No Combustion
P1510	EFI Limited Performance Mode
P1632	EFI Module Processor Internal Error
U0184	Lost Communication with Radio
U0141	Lost Communication with LHCM
P2300	Ignition Coil Driver Open Circuit
B2141	Internal Control Module Software Incompatibility

Here’s a break down of all of the codes (including these) in one place:
– Unlock the Power of Harley Diagnostic Codes (PDF Included) (theseasonedwrench.com)

Or, here’s a PDF if you’d like to download it here:

Harley Code P0562

The Harley Davidson diagnostic code P0562 indicates an issue with the battery or the ECM voltage. The code typically appears when the battery voltage drops below the normal range required for optimal motorcycle operation. In this case, check your bike’s charging system and battery health. Replace the battery if necessary and check for any potential issues with the ECM.

Harley Code P1356

The Harley Davidson diagnostic code P1356 is used to signal a problem with the rear cylinder’s combustion. This issue can result in a significant decrease in your bike’s performance. It’s typically caused by problems with the ignition system, such as faulty spark plugs or ignition coils. To fix this issue, inspect the ignition system and replace any faulty components.

Harley Code P1510

The Harley diagnostic code P1510 indicates a problem with the EFI (Electronic Fuel Injection) system. When this code appears, the EFI system switches to a “limited performance mode” to prevent damage and safeguard the rider. This issue could be due to various problems, including a faulty throttle position sensor, wiring issues, or problems with the EFI module itself.

Harley Code P1632

The Harley Davidson diagnostic code P1632 is associated with a malfunction in the ECM (Electronic Control Module). This code generally points towards an internal error within the EFI Module Processor. If this code appears, it’s crucial to have your bike’s ECM checked and repaired by a professional.

U0184 Harley Code

The Harley Davidson diagnostic code U0184 signifies a communication issue between the bike’s system and its radio. This error might occur due to problems with the radio itself, issues with the wiring or the onboard computer. If you encounter this code, consider seeking professional help to diagnose and rectify the issue.

U0141H Harley Code

The Harley Davidson diagnostic code U0141H indicates a communication issue with the LHCM (Left Hand Control Module). This could be due to a fault in the LHCM, a wiring issue or a problem with the bike’s onboard computer. This issue can affect the functioning of the controls and should be addressed immediately.

P2300 Harley Code

The Harley Davidson diagnostic code P2300 points to a problem with the ignition coil driver circuit. This issue can impact the bike’s ignition system, affecting its performance. If you encounter this code, you should inspect the ignition coil and its associated wiring, replacing any faulty components as necessary.

Harley Code B2141

The Harley Davidson diagnostic code B2141 is linked to a problem with the bike’s internal control module software. This issue can cause a range of problems, from minor glitches to significant bike malfunctions. If this code appears, it’s advisable to take your bike to a professional for software troubleshooting and potential updates.

Honorable mentions:
– B1006 Harley Code: Causes and Solutions

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How To Clear Harley Diagnostic Trouble Codes

Clearing Diagnostic Trouble Codes (DTCs) on a Harley Davidson is often necessary after resolving the issues they indicate. However, it’s crucial to ensure that the underlying problem has been properly fixed before clearing the codes. Here’s how you can clear them:

1. Enter Diagnostics Mode: Just like when reading the codes, start by entering the diagnostics mode. Turn the ignition to “On” and press and hold the odometer reset button. Release it when the diagnostics mode is engaged.
2. Navigate to Codes: Use the odometer reset button to navigate through the menu until you find the option for clearing the codes. This option varies depending on the model of your Harley Davidson.
3. Clear the Codes: Once you’ve located the clear codes option, select it to clear the diagnostic trouble codes. This action usually requires you to hold down the reset button for a few seconds.
4. Confirmation: After the codes have been cleared, the system typically provides a confirmation. This can be a message on the display or a blinking light.
5. Exit Diagnostics Mode: Turn the ignition to the “Off” position to exit the diagnostics mode.

Remember, clearing the codes does not fix the problem. It simply resets the motorcycle’s computer system, removing any active or stored codes. If the issue has not been resolved, the codes will likely reappear after some time or under certain operating conditions. Therefore, it’s always recommended to address the issue first before clearing the codes. Here’s a video for how to follow this process, if you’re more of a visual learner:

Wrapping Up

In conclusion, understanding Harley Davidson diagnostic codes can significantly simplify your bike maintenance and troubleshooting efforts. However, it’s crucial to remember that while this guide provides a good starting point, some issues might be more complex than they appear. For complicated problems or if you’re unsure about performing a repair yourself, it’s always advisable to consult a professional. – or at the very least, keep your technical resources handy:

> Torque Specs for Harley Davidson: Ultimate Guide (PDF)
> Complete Harley Davidson Tire Size Chart (PDF)

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Frequently Asked Questions