Troubleshooting U11B8 Code on a 2013 Dodge Dart: Finding the Right OBD2 Reader and Diagnostic Steps

Experiencing trouble codes with your 2013 Dodge Dart can be frustrating, especially when it impacts your vehicle’s performance and dashboard warnings. One common issue is the U11B8 code, indicating a “Lost Communication With Integrated Center Stack (ICS).” Understanding this code and how to diagnose it is crucial for any Dodge Dart owner. This guide will walk you through the diagnostic process for the U11B8 error, and discuss how a compatible OBD2 reader for your 2013 Dodge Dart is an indispensable tool in resolving this issue.

Understanding the U11B8 Diagnostic Trouble Code

The U11B8 DTC (Diagnostic Trouble Code) signals a communication breakdown between your 2013 Dodge Dart’s Integrated Center Stack (ICS) module and other control modules in the vehicle’s network. The ICS is essentially the brain behind your car’s infotainment system, climate controls, and potentially other features depending on your Dart’s configuration. When communication is lost, it can lead to various malfunctions and warning lights.

What Does “Lost Communication With Integrated Center Stack (ICS)” Mean?

Modern vehicles like the 2013 Dodge Dart rely on a complex network called the Controller Area Network (CAN) bus system. This system allows different electronic control modules (ECMs) to communicate and share data efficiently. The U11B8 code means that the Body Control Module (BCM), which acts as a gateway between different CAN buses in your Dart, has not received messages from the ICS for a certain period.

Possible Symptoms of a U11B8 Code

While the U11B8 code is primarily a communication issue, you might observe several symptoms in your 2013 Dodge Dart, including:

• Malfunctioning Infotainment System: Issues with the radio, touchscreen, navigation, or other features controlled by the ICS.
• Climate Control Problems: Erratic or unresponsive heating and air conditioning controls.
• Warning Lights: Check Engine Light, or other warning lights related to communication or electronic systems might illuminate on your dashboard.
• Other Electronic Glitches: Depending on how the ICS is integrated with other vehicle functions, you might experience other unexpected electronic behaviors.

Potential Causes of U11B8 Code in a 2013 Dodge Dart

Several factors can lead to a U11B8 error. Pinpointing the exact cause requires systematic troubleshooting. Here are the common culprits:

• CAN Bus Circuit Issues:
  • Open or Shorted Circuits: Damage to the CAN bus wiring, including breaks, shorts to voltage, or shorts to ground.
  • Connector Problems: Loose, corroded, or damaged connectors in the CAN bus network.
• Power and Ground Issues to the ICS: Insufficient power supply or grounding to the Integrated Center Stack module itself.
• BCM Configuration Errors: If the Body Control Module is not correctly configured, it can disrupt communication.
• Faulty Integrated Center Stack (ICS) Module: In some cases, the ICS module itself might be defective and causing the communication problem.
• Related DTCs: Pre-existing Diagnostic Trouble Codes related to battery voltage, ignition, or Vehicle Identification Number (VIN) messages can sometimes trigger communication errors.

Step-by-Step Diagnostic Procedure for U11B8 Code

Diagnosing the U11B8 code requires a systematic approach. Here’s a breakdown of the diagnostic steps, mirroring the troubleshooting process a professional technician would follow. Having a compatible OBD2 reader for your 2013 Dodge Dart is essential for this process, as it allows you to read active DTCs and monitor system communication.

Before You Begin:

• Ensure your 2013 Dodge Dart’s battery voltage is within the normal operating range (10-16 volts). Low battery voltage can cause spurious DTCs.
• You will need an OBD2 scan tool to proceed with these steps. Make sure you have a reliable OBD2 reader compatible with the 2013 Dodge Dart.

Step 1: Verify the DTC is Active

1. Turn the ignition ON in your 2013 Dodge Dart (do not start the engine).

2. Connect your OBD2 reader to the OBD2 port, typically located under the dashboard on the driver’s side.

3. Use the scan tool to read active DTCs.

   • Is U11B8 DTC active?
     • Yes: Proceed to the diagnostic procedure specifically for U11B8-87 “Lost Communication With Integrated Center Stack (ICS) – Missing Message” (as outlined in the original service information). This usually involves further steps focusing on the CAN bus and ICS module.
     • No: The DTC might be stored or intermittent. Refer to a “Stored Lost Communication DTCs diagnostic procedure” which typically involves checking for historical codes and potential intermittent issues in the communication network.

Step 2: Check for Related Active DTCs

1. With your OBD2 reader still connected, read active DTCs from all modules in your 2013 Dodge Dart’s system.

2. Pay close attention to DTCs related to:

   • BCM configuration errors.

   • CAN Interior Bus hardware electrical faults.

   • VIN Missing/Mismatch issues.

   • Battery voltage or ignition system problems.

   • Are there any related active DTCs present?

     • Yes: Diagnose and repair the related DTCs first. Issues with power, ground, or VIN can indirectly cause communication problems. Refer to the specific diagnostic procedure for each related DTC.
     • No: Proceed to Step 3.

Step 3: Verify the Integrated Center Stack (ICS) is Active on the Bus

1. Turn the ignition ON.

2. Use your OBD2 scan tool to check if the ICS is active on the CAN bus. Your scan tool should have a function to display modules present on the network.

   • Is the ICS active on the bus?
     • Yes: Proceed to Step 4. This indicates the ICS is at least partially communicating, but there might be intermittent issues or other modules having trouble communicating with it.
     • No: This suggests a more significant communication failure with the ICS. Refer to a “NO RESPONSE FROM ICS (INTEGRATED CENTER STACK)” diagnostic procedure. This usually focuses on checking power and ground to the ICS and the integrity of the CAN bus wiring connected to it.

Step 4: Check for Additional Communication Related DTCs

1. With the OBD2 reader, read all DTCs again.

2. Determine if more than one module has active DTCs “Logged Against” the ICS. This means other modules are reporting communication problems specifically with the ICS.

   • Are there multiple modules with active DTCs logged against the ICS?
     • Yes: This could indicate a fault within the ICS module itself. Consider replacing or updating the ICS module according to service information and perform a “BODY VERIFICATION TEST” afterwards to ensure proper system integration.
     • No: Proceed to Step 5.

Step 5: Clear DTC in Module Setting Fault

1. Use your OBD2 scan tool to select the module that originally set the U11B8 DTC.
2. Clear the active DTCs from that module.
   • Is the U11B8 DTC still active after clearing?
     • Yes: This suggests a persistent fault within the module that set the DTC. Consider replacing or updating that module according to service information and perform the appropriate verification tests, including a “BODY VERIFICATION TEST” if necessary.
     • No: Proceed to Step 6.

Step 6: Cycle Ignition

1. Cycle the ignition from RUN to OFF three times, ending with the key in the RUN position.
   • Does the U11B8 DTC become active again?
     • Yes: Proceed to Step 7. The fault is likely still present.
     • No: The condition might be intermittent. Carefully inspect wiring harnesses, splices, and connectors related to the CAN bus and ICS for signs of damage, water intrusion, corrosion, or loose terminals. Perform a “BODY VERIFICATION TEST” to confirm repairs.

Step 7: Check for Additional Lost Communication Faults

1. Use your OBD2 scan tool to view the modules on the CAN bus network.

2. Check if the BCM and other CAN IHS BUS modules show “Lost Communication” with other CAN IHS BUS modules.

   • Do the BCM and other CAN IHS BUS modules show widespread lost communication?
     • Yes: This points to a potential issue affecting the entire CAN IHS bus. Proceed to Step 8 to investigate potential shorts to voltage on the CAN bus.
     • No: The issue is likely isolated to the module that originally set the U11B8 code or its direct communication with the ICS. Consider replacing or updating that module and perform verification tests.

Step 8: Check the CAN IHS Bus (125K) (+) Circuit for a Short to Voltage

1. Measure the voltage between the (D157) CAN IHS Bus (125K) (+) circuit and ground. You will need a wiring diagram for your 2013 Dodge Dart to locate pin D157.
   • Is the voltage above 5.0 volts?
     • Yes: There is a short to voltage on the CAN IHS Bus (+) circuit. Repair the short by carefully inspecting the wiring harness and using “Star Connectors” (junction points in the CAN bus) to isolate sections of the bus and pinpoint the location of the short. Perform a “BODY VERIFICATION TEST” after repair.
     • No: Proceed to Step 9.

Step 9: Check the CAN IHS Bus (125K) (-) Circuit for a Short to Ground

1. Turn the ignition OFF.
2. Measure the resistance between ground and the (D158) CAN IHS Bus (125K) (-) circuit. Again, a wiring diagram is necessary to identify pin D158.
   • Is the resistance below 10k Ohms?
     • Yes: There is a short to ground on the CAN IHS Bus (-) circuit. Repair the short by inspecting the wiring and using Star Connectors to isolate sections of the bus and locate the short to ground. Perform a “BODY VERIFICATION TEST” after repair.
     • No: If no shorts are found, and you’ve followed all previous steps, consider replacing or updating the module that originally set the U11B8 DTC, as it might be faulty. Perform appropriate verification tests, including a “BODY VERIFICATION TEST”.

Choosing a Compatible OBD2 Reader for Your 2013 Dodge Dart

Having a compatible OBD2 reader is not just helpful, but essential for diagnosing modern vehicle issues like the U11B8 code in your 2013 Dodge Dart. When selecting an OBD2 reader, consider these factors to ensure compatibility and functionality:

• CAN Bus Support: Ensure the reader supports CAN bus protocols, as this is the communication standard used in the 2013 Dodge Dart. Most modern OBD2 readers will support CAN, but it’s always good to confirm specifications.
• DTC Reading and Clearing: A basic requirement is the ability to read Diagnostic Trouble Codes (DTCs) and clear them after repairs.
• Module-Specific Diagnostics: For more in-depth troubleshooting, consider a reader that allows you to access and diagnose specific modules like the BCM and ICS. Some advanced readers offer functionalities like live data streaming and bidirectional control, which can be beneficial for complex diagnostics.
• Compatibility with 2013 Dodge Dart: While OBD2 is a standard, some readers might have better compatibility or specific features for certain makes and models. Check product descriptions or reviews to ensure good compatibility with Dodge vehicles, particularly the 2013 Dart.

In Conclusion

Troubleshooting a U11B8 code in your 2013 Dodge Dart requires a methodical approach and the right tools. By following these diagnostic steps and utilizing a compatible OBD2 reader, you can effectively pinpoint the cause of the communication issue and take appropriate action. Remember to always consult your vehicle’s service manual for detailed wiring diagrams and specific procedures when performing electrical diagnostics. With patience and the right resources, you can resolve the U11B8 code and get your 2013 Dodge Dart back to optimal performance.