u1040 harley code

U1040 Harley Code – Understanding and Troubleshooting the ABS Light Issue

Greetings. Today, we will explore the U1040 Harley code in depth. If your ABS light is on and you have no idea why, then this article was written just for you. We’ll discuss what triggers the U1040 code, how to diagnose it properly, and a few steps to resolve any related issues quickly. Let’s jump right into it.

Understanding the U1040 Harley Code

If the U1040 Harley code is observed, it can be attributed to a loss of communication between both the ABS module and ECM in your bike. To begin troubleshooting proactively, it’s imperative to first understand what could have caused this issue. Here are some possible causes for the U1040 code:

  1. Open ABS fuse
  2. Open battery circuit
  3. Open ground circuit
  4. Open serial data circuit
  5. Short to ground in power circuit
  6. ECU malfunction

Troubleshooting the U1040 Harley Code

To effectively address the U1040 code, you must walk through a series of steps. Here’s an overview to help guide your process:

Step 1: Ensure that the ABS fuse is not blown. If it has, replace it and observe if this resolves your difficulty.

Step 2: Ensure that power is being supplied to the ABS module; if it’s not, trace the wiring back to its origin point in order to pinpoint potential issues.

Step 3: Ensure that the ground wire for your ABS module is securely connected. If it’s not, you may have to reattach or change out the wire so it is properly grounded.

Step 4: Confirm that the ABS module and BCM can communicate via serial data or CAN Bus wiring. If you find an issue with communication, it is essential to repair or change out the existing wires as soon as possible.

Step 5: Scrutinize wiring for any potential short circuits to avoid malfunctioning of the system. If you find any, repair or replace them promptly in order to guarantee proper functioning.

Step 6: If all the other diagnostics have been checked and are up to standard, it’s possible that your ABS module needs replacing.

Testing and Diagnosing the Issue

To test and diagnose the U1040 code, you can follow these steps:

  1. To get started, set the RUN/STOP switch to RUN with the engine off.
  2. Press and hold the Trip Switch, then turn on the ignition. The ODO should read “DIAG.”
  3. Activate the Trip switch, then hit and deactivate it until the display reads “ABS.”
  4. To receive the first code, simply press and hold down the trip button when “ABS” is displayed.
  5. To display the second code, engage and disengage the trip switch.

Some common ABS-related codes you might encounter include:

  • C1032: Front wheel speed sensor circuit open or shorted
  • C1216: Rear brake switch open

Addressing the U1040 Harley Code

After you have identified the source of U1040 code, it is time to take action. One potential solution for this issue is to guarantee that your ABS fuse has a strong connection. It appears from some vehicles’ repair reports that bending the leg of the fuse and ensuring better contact can fix this problem.

If you’re puzzled and need extra help, the Electrical Diagnostic Manual provides step-by-step instructions for troubleshooting codes. So never be hesitant to access it if you want more information.


Uncovering the solution to U1040 Harley Code can be a vexatious task, but if you methodically go through all of the potential sources and analysis any issues along the way, it will make locating an effective resolution more efficient. Remember to carefully inspect all wiring connections in addition to testing ABS module capabilities. Eradicate each problem as you uncover them and soon enough your troubles with this code should disappear.

If you are still in doubt or need assistance, do not hesitate to consult the Electrical Diagnostic Manual or seek expert help from a qualified technician.

Taking your time and attentively going through the troubleshooting steps is always preferable in order to get to the bottom of any issue with your bike. Skipping steps or hurrying could lead to overlooking a problem, or worse still cause more damage.

Preventative Measures

To prevent future ocurrences of the U1040 code, it’s crucial to take preventive measures. Inspect your bike’s wiring and connections frequently to guarantee they remain in optimal condition. Check for any indicators of wear or damage that might result in a lack of communication between the ABS module and ECM.

To prevent the U1040 code, make sure to regularly check the ABS fuse and its connection. Maintaining a good link at the fuse can often be enough to keep this problem from occurring in the first place. Take care of that part of your vehicle’s maintenance routine and you’ll save yourself some potential headaches down the road.

To ensure your Harley runs smoothly, it’s paramount to stay up-to-date with proper maintenance. By conducting routine checks and services, you can identify any underlying issues before they become costly problems in the future – ultimately saving time, money, and stress.

The U1040 Harley Code In Summary

The U1040 Harley code can be irritating, but with the right know-how and perseverance you’ll soon have it conquered. Ensure all cables are checked over, that the ABS module is examined for damage, and if needed to consult a Electrical Diagnostic Manual. By consistently remaining on top of your bike’s maintenance needs and tending to any issues instantly, you will get back in the driver seat quickly. So keep biking – enjoy every minute of this thrilling journey.


Below are some FAQs on the U1040 Harley code ABS Light Issue:

What is the U1040 Harley code, and why does it appear?

The U1040 Harley code alerts you to a lack of communication between the ABS module and ECM in your motorcycle. This issue may have several potential causes, such as an open fuse for the ABS system, faulty battery or ground circuits, or even a short circuit in the power line. It could also be due to an ECU malfunctioning.

How do I know if my bike has a U1040 Harley code?

To identify the U1040 code, simply follow the diagnostic steps outlined earlier in this article. This process involves starting your ignition, holding down the Trip Switch button, and examining any codes displayed on your ODO meter.

How can I fix the U1040 Harley code?

To repair the U1040 Harley code, you first need to take time to identify what’s causing it. Going through the troubleshooting steps provided in this article could give you some answers. Possible solutions may range from replacing the ABS fuse and wiring to ensuring proper grounding or installing a new ABS module – depending on what’s wrong with your car.

Can I ride my bike with the U1040 code and the ABS light on?

While your bike may still operate with the U1040 code and ABS light on, it’s not wise to ride it without dealing with the issue. The ABS system is an essential safety feature that helps avert brake lock-up during braking. Continuing to ride with a dysfunctional ABS can be life-threatening in emergency stopping scenarios, so make sure you take care of this problem ASAP.

How can I prevent the U1040 code from reoccurring?

Avoid future issues with the U1040 code by consistently maintaining your bike, such as inspecting and repairing any broken wires, keeping the ABS fuse clean and secure in its connections, and promptly dealing with any potential problems.

 Should I consult a professional technician if I can’t resolve the U1040 code issue myself?

If you find yourself at a loss when it comes to the U1040 code, seeking professional help is your best bet. Skilled technicians have the know-how and tools needed to identify and resolve this issue swiftly, guaranteeing that your bike’s ABS system performs optimally and securely.

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