If you own a Harley-Davidson motorcycle and have been experiencing issues with the fuel gauge, you may have encountered error code B1212. This code indicates that the fuel signal is low, which can cause inaccurate readings on your fuel gauge. Fortunately, there are steps you can take to diagnose and fix this issue.
To begin, you can read the B1212 code on your Harley-Davidson without the need for a diagnostic tool. Simply use the trip reset button to display the code on your odometer. From there, you can consult a fault code chart or diagnostic manual to determine the root cause of the issue. In many cases, the problem may be related to a faulty fuel sender or wiring issue.
If you’re not comfortable diagnosing and fixing the issue yourself, it’s always best to take your Harley-Davidson to a qualified mechanic. They can use specialized tools and their expertise to quickly and accurately diagnose the issue and provide a solution. By addressing the B1212 code promptly, you can ensure that your fuel gauge is working correctly and avoid running out of gas unexpectedly on the road.
Understanding Harley Codes
If you own a Harley-Davidson motorcycle, you may have come across diagnostic trouble codes (DTCs) before. These codes are generated by the onboard diagnostic system (OBD) to help you identify issues with your bike. In this section, we’ll take a closer look at Harley codes, including the B1212 code.
What Is a Harley Code?
A Harley code is a diagnostic trouble code that is generated by the OBD system. When a fault is detected, the OBD system will set a code, which can be read using a diagnostic tool. The code will be a combination of letters and numbers that will help you identify the issue with your bike.
Common Harley Diagnostic Codes
There are many Harley diagnostic codes, but some are more common than others. Here are a few of the most common codes that you may come across:
- B2112: ACC output shorted high.
- B1211: TSM/TSSM/HFSM not installed or not properly installed.
- B1103: Fuel sender open/high.
- B1153: Sidecar BAS short to ground.
- B1200: Fuel fill sensor circuit low.
- B1210: TSM/TSSM/HFSM signal low.
- B1213: TSM/TSSM/HFSM signal high.
- B1300: Ignition switch run/acc circuit malfunction.
- B1301: Ignition switch hi/low beam malfunction.
- B1302: Ignition switch 3 circuit malfunction.
- B1303: Ignition switch start circuit malfunction.
- B1304: Starter output high circuit malfunction.
- B1305: Starter output low circuit malfunction.
- B1306: Ignition output high circuit malfunction.
- B1309: EEPROM malfunction.
- B1310: Alarm output low circuit malfunction.
- B1312: Alarm output high circuit malfunction.
- B1313: Starter relay circuit malfunction.
- B1314: Fuel supply voltage low.
B1212 Code
The B1212 code is a fuel signal low code. This code is generated when the fuel signal is low, which can be caused by a faulty fuel gauge or sender. To diagnose this issue, you will need to check the fuel gauge and sender circuits for any faults. You may need to replace the fuel gauge or sender if they are found to be faulty.
In conclusion, understanding Harley codes is important for any Harley-Davidson owner. By knowing what the codes mean, you can diagnose issues with your bike and get them fixed quickly. If you come across the B1212 code, be sure to check the fuel gauge and sender circuits for any faults.
Electrical System Overview
When it comes to your Harley-Davidson motorcycle, the electrical system is an essential component that keeps everything running smoothly. The system comprises several parts that work together to ensure that your bike runs efficiently.
Battery and Charging System
The battery is the heart of your Harley’s electrical system. It provides the power needed to start the engine and run all the electrical components on your bike. The charging system is responsible for keeping the battery charged and ready to go.
If your battery is weak or dead, it can cause all sorts of problems, from difficulty starting the engine to dim lights and other electrical issues. To avoid these problems, it’s essential to keep your battery in good condition and make sure it’s charging correctly.
Ignition System Components
The ignition system is responsible for starting your bike’s engine and keeping it running. It comprises several components, including the ignition switch, ECU, and BCM.
The ignition switch is the component that you use to turn your bike on and off. If your ignition switch is faulty, it can cause all sorts of problems, from the engine not starting to the bike shutting off unexpectedly.
The ECU (Engine Control Unit) is the brain of your bike’s ignition system. It controls the fuel injection, ignition timing, and other critical engine functions. If your ECU is not working correctly, it can cause all sorts of issues, from poor engine performance to difficulty starting the engine.
The BCM (Body Control Module) is responsible for controlling all the electrical components on your bike, from the lights to the radio and everything in between. If your BCM is not working correctly, it can cause all sorts of electrical issues, from flickering lights to complete electrical failure.
In conclusion, understanding the electrical system on your Harley-Davidson motorcycle is essential to keep your bike running smoothly. By taking care of your battery, charging system, and ignition system components, you can avoid many of the common electrical issues that can plague your bike.
Troubleshooting Code B1212
If you’re experiencing trouble with your Harley-Davidson motorcycle and the diagnostic trouble code (DTC) B1212 has appeared, there are a few steps you can take to diagnose and resolve the issue.
Steps for Diagnosis
First, check the battery voltage to ensure it’s not the source of the problem. Low battery voltage can cause all sorts of issues, including DTC B1212. If the battery voltage is low, charge it up and see if the code disappears.
Next, check the instrument cluster. The B1212 code is related to the fuel signal, so make sure your fuel gauge is working properly. If it’s not, there may be an issue with the instrument cluster or the fuel sender.
If the fuel gauge is working properly, check the wiring harness for any damage or loose connections. Corrosion or damage to the wiring harness can cause electrical issues that trigger DTC B1212.
Finally, check the vehicle identification number (VIN) and the controller area network (CAN) bus. If there are issues with either of these components, it can cause DTC B1212 to appear.
Resolving Electrical Issues
If you’ve checked all of the above and are still experiencing issues with DTC B1212, it’s time to start resolving any electrical issues that may be causing the problem.
Start by checking the ignition switch system (ISS) and the electronic control module (ECM). The ISS is responsible for sending signals to the ECM, and if it’s not working properly, it can cause all sorts of issues. The ECM is the brain of the motorcycle, and if it’s not working properly, it can cause DTC B1212 to appear.
Check the wiring harness for any damage or loose connections. Corrosion or damage to the wiring harness can cause electrical issues that trigger DTC B1212.
If you’re still having issues after checking all of the above, it may be time to take your Harley-Davidson to a professional mechanic for further diagnosis and repair.
Harley Control Modules
Harley-Davidson motorcycles are equipped with various control modules that are responsible for different systems on the bike. These modules communicate with each other through a network called the Controller Area Network (CAN) bus. When a fault occurs in one of these modules, it can cause issues with other systems on the bike. In this section, we’ll take a closer look at two of the most important control modules on a Harley-Davidson: the Body Control Module (BCM) and the Engine Control Unit (ECU).
Body Control Module (BCM)
The BCM is responsible for controlling various electrical systems on the bike, including the lights, turn signals, horn, and security system. It also receives input from various sensors on the bike, such as the fuel level sensor and the ambient air temperature sensor. When a fault occurs in the BCM, it can cause issues with these systems.
One common fault code associated with the BCM is B1212, which indicates a fuel signal low. This could be caused by a faulty fuel level sensor or a wiring issue. To diagnose this issue, you’ll need to access the onboard diagnostics and confirm the diagnostic trouble codes (DTCs) stored under the BCM.
Engine Control Unit (ECU)
The ECU is responsible for controlling the fuel injection system and ignition timing on the bike. It receives input from various sensors on the bike, such as the throttle position sensor and the oxygen sensor. When a fault occurs in the ECU, it can cause issues with the engine performance.
Two common fault codes associated with the ECU are LHCM internal error and RHCM internal error. These codes indicate an issue with the left-hand or right-hand cylinder module, respectively. This could be caused by a faulty module or a wiring issue. To diagnose this issue, you’ll need to access the onboard diagnostics and confirm the DTCs stored under the ECU.
In addition to the BCM and ECU, there are other control modules on a Harley-Davidson that can cause issues. For example, an IM internal fault could indicate an issue with the instrument module. It’s important to diagnose and fix these issues as soon as possible to prevent further damage to the bike.
Accessory Circuit Failures
If you’re experiencing issues with your Harley’s accessory circuit, it’s important to understand the possible causes and solutions. The B1212 code typically indicates a problem with the EIC’s Switch 2 assembly circuit, which can lead to various issues with the accessory circuit. Here’s what you need to know about accessory circuit failures and how to address them.
ACC Output Issues
One of the most common issues with the accessory circuit is an ACC output shorted high. This can occur due to a variety of reasons, such as a damaged or corroded wiring harness, a faulty switch, or a blown fuse. When the ACC output is shorted high, it can cause various problems with the accessory circuit, such as the instruments and accessory circuit remaining powered even when the ignition is off.
To fix an ACC output shorted high, you may need to inspect the wiring harness and connectors for damage or corrosion. You may also need to replace the switch or fuse if they are faulty. In some cases, reprogramming the BCM may be necessary to resolve the issue.
Fuel Pump Output Problems
Another issue that can occur with the accessory circuit is fuel pump output problems. This can manifest as a B1212 code indicating a fuel signal low or high, or a fuel pump output open. When this occurs, the fuel pump may not receive the necessary power to function properly, which can lead to engine performance issues.
To address fuel pump output problems, you may need to inspect the fuel pump wiring harness and connectors for damage or corrosion. You may also need to replace the fuel pump or fuel pump relay if they are faulty. In some cases, reprogramming the BCM may be necessary to resolve the issue.
Overall, accessory circuit failures can be frustrating and potentially dangerous if left unaddressed. By understanding the potential causes and solutions for ACC output and fuel pump output problems, you can take the necessary steps to keep your Harley running smoothly and safely.
Signal and Switch Issues
When it comes to Harley Davidson BCM issues, one of the most common problems is the B1212 code. This code usually indicates a short problem in one of the switches in the cluster. In this section, we’ll discuss some of the signal and switch issues that can cause this code to appear.
Turn Signal and Run/Stop Switch Failures
The turn signal and run/stop switches are two of the most important components in the cluster. If these switches fail, it can cause the B1212 code to appear. One of the most common reasons for these switches to fail is due to wear and tear. Over time, the contacts inside the switches can become worn down, which can cause them to stop working properly.
To fix this issue, you may need to replace the switches. You can check the switches by using a multimeter to test the continuity of the contacts. If the switches are faulty, you’ll need to replace them with new ones.
Control Button Malfunctions
Another common issue that can cause the B1212 code to appear is control button malfunctions. These buttons are responsible for controlling various functions in the cluster, such as the odometer and trip meter. If these buttons malfunction, it can cause the code to appear.
One of the most common reasons for control button malfunctions is due to dirt and debris getting trapped inside the buttons. Over time, this can cause the contacts to become dirty, which can prevent them from working properly.
To fix this issue, you can try cleaning the buttons with a small amount of rubbing alcohol and a cotton swab. If this doesn’t work, you may need to replace the buttons.
In addition to turn signal and run/stop switch failures and control button malfunctions, there are other issues that can cause the B1212 code to appear. For example, the rear hand controls may shorted high or low, which can cause the code to appear. If you’re experiencing this issue, it’s best to consult with a professional mechanic to diagnose and fix the problem.
Advanced Diagnostics
If you’re experiencing issues with your Harley-Davidson motorcycle and need to troubleshoot a specific problem, you may need to access advanced diagnostic trouble codes. These codes can help you identify the root cause of the issue, allowing you to make the necessary repairs.
Reading Advanced Trouble Codes
To access advanced trouble codes on your Harley-Davidson motorcycle, you’ll need to use a diagnostic tool. The diagnostic tool will allow you to read and interpret the codes, giving you an idea of what’s going on with your bike.
One common trouble code that you may encounter is B1212. This code indicates that there is a problem with the fuel signal being too low. This can be caused by a variety of issues, such as a faulty fuel gauge or a problem with the fuel sender unit.
Using Diagnostic Tools
To access advanced trouble codes, you’ll need to use a diagnostic tool. There are a variety of diagnostic tools available on the market, ranging from simple handheld devices to more advanced computer-based systems.
One popular diagnostic tool for Harley-Davidson motorcycles is the Fuel Injection (FI) module. This module allows you to access advanced trouble codes, as well as perform other diagnostic functions such as checking the throttle position sensor (TPS) and the engine temperature (ET) sensor.
When using a diagnostic tool, it’s important to follow the manufacturer’s instructions carefully. This will ensure that you get accurate readings and can diagnose the problem correctly.
In conclusion, accessing advanced trouble codes can be a valuable tool when troubleshooting issues with your Harley-Davidson motorcycle. By using a diagnostic tool and following the manufacturer’s instructions, you can identify the root cause of the problem and make the necessary repairs to get your bike back on the road.
Preventive Measures and Maintenance
Regular Inspection and Service
To prevent the occurrence of Harley code B1212, it is important to ensure that your motorcycle undergoes regular inspection and service. A thorough inspection of the battery and ignition switch can help identify any potential issues before they become major problems. Regular service can also help to ensure that all components are functioning optimally, including the fuel signal.
To keep your bike in good shape, make sure to follow the manufacturer’s recommended maintenance schedule. This will typically include regular oil changes, tire rotations, and other important checks. If you notice any unusual behavior from your motorcycle, such as difficulty starting or a low fuel signal, it’s important to have it checked out by a professional mechanic.
Upgrading Components
Upgrading certain components of your motorcycle can also help to prevent the occurrence of Harley code B1212. For example, upgrading your battery to a high-quality, reliable model can help to ensure that your motorcycle always has sufficient power. Additionally, upgrading your ignition switch can help to prevent issues that may lead to the code being triggered.
If you’re experiencing frequent issues with the fuel signal, it may be worth upgrading your fuel system. This can include replacing the fuel pump or upgrading to a higher-quality fuel filter. By taking these steps, you can help to ensure that your motorcycle is running smoothly and that you’re not at risk of encountering Harley code B1212.
Remember, preventive maintenance is key to keeping your motorcycle in good condition. By regularly inspecting and servicing your bike, and upgrading components where necessary, you can help to prevent the occurrence of Harley code B1212 and other issues.