Introduction:
The diagnostic trouble code (DTC) U0119, "Lost Communication With Steering Column Control Module," indicates a failure in communication between various modules within a vehicle's electronic system. This code signifies that the car's computer network, often a Controller Area Network (CAN) bus, has lost its connection to the Steering Column Control Module (SCCM), hindering the proper functioning of systems reliant on SCCM data. This interruption can lead to a range of issues, affecting features like power steering, turn signals, and even the vehicle's starting ability, making prompt diagnosis and repair crucial for safety and functionality.
Table: U0119 Reserved by Document - Causes, Symptoms, and Solutions
| Category | Description | Potential Solutions |
|---|---|---|
| Possible Causes | Faulty Steering Column Control Module (SCCM): This is the most common culprit. Internal electronic failure within the module prevents it from communicating. Wiring Issues: Damaged, corroded, or loose wiring and connectors between the SCCM and the CAN bus. This disrupts the signal transmission. CAN Bus Problems: Issues with the CAN bus itself, such as shorts, opens, or high resistance, can prevent communication between modules. Low Battery Voltage: Insufficient voltage can cause modules to malfunction or fail to communicate properly. Faulty Module Programming: Corrupted or incorrect software in the SCCM can lead to communication errors. Faulty Gateway Module: The gateway module acts as a translator between different CAN bus systems; a failure can prevent communication. Ignition Switch Problems: A faulty ignition switch might not properly activate the SCCM or the CAN bus. | Replace the SCCM: If the module is faulty, replacement is often necessary. Repair Wiring and Connectors: Inspect and repair any damaged or corroded wiring and connectors. Ensure proper connections. Diagnose and Repair CAN Bus: Use a CAN bus diagnostic tool to identify and repair any issues with the CAN bus. Check and Charge/Replace Battery: Ensure the battery is in good condition and providing sufficient voltage. Charge or replace as needed. Reprogram the SCCM: Use a scan tool to reprogram the SCCM with the correct software. Repair or Replace Gateway Module: Diagnose and repair or replace the gateway module if it's faulty. Repair or Replace Ignition Switch: Diagnose and repair or replace the ignition switch if it's not functioning correctly. |
| Common Symptoms | Loss of Power Steering: The power steering system may not function, making the vehicle difficult to steer. Malfunctioning Turn Signals: Turn signals may not work properly or at all. Airbag Warning Light On: The airbag system may be affected, triggering the airbag warning light. Horn Malfunction: The horn may not work. Cruise Control Inoperable: The cruise control system may not function. Vehicle May Not Start: In some cases, the loss of communication can prevent the vehicle from starting. Warning Messages on Dashboard: Various warning messages related to steering, airbags, or other systems might appear. Erratic Wiper Operation: The windshield wipers might operate erratically or not at all. | Address Power Steering Immediately: Have the power steering system checked and repaired immediately. Check Turn Signal Functionality: Ensure turn signals are working correctly for safety. Diagnose Airbag System: Have the airbag system diagnosed and repaired promptly. Check Horn Operation: Ensure the horn is functioning correctly. Address Cruise Control Issues: Have the cruise control system diagnosed and repaired. Diagnose Starting Issues: Have the starting system diagnosed and repaired immediately. Investigate Warning Messages: Have all warning messages investigated and addressed. Check Wiper Operation: Ensure the windshield wipers are functioning correctly. |
| Diagnostic Steps | Scan for DTCs: Use an OBD-II scanner to retrieve all stored DTCs. Inspect Wiring and Connectors: Visually inspect the wiring and connectors related to the SCCM for damage or corrosion. Check Battery Voltage: Verify that the battery voltage is within the acceptable range. Test SCCM Power and Ground: Ensure the SCCM is receiving proper power and ground. Perform CAN Bus Diagnostics: Use a CAN bus diagnostic tool to check for communication issues. Check Ignition Switch Operation: Verify that the ignition switch is functioning correctly. Review Technical Service Bulletins (TSBs): Check for any TSBs related to the U0119 code for the specific vehicle make and model. Use a Multimeter: Use a multimeter to test the continuity and voltage of the wiring and connectors. | Record All DTCs: Document all stored DTCs before clearing them. Clean and Secure Connectors: Clean any corroded connectors and ensure they are securely connected. Charge or Replace Battery: Charge or replace the battery if it's not providing sufficient voltage. Repair Power and Ground Circuits: Repair any issues with the power and ground circuits to the SCCM. Repair CAN Bus Issues: Repair any issues with the CAN bus, such as shorts or opens. Repair or Replace Ignition Switch: Repair or replace the ignition switch if it's not functioning correctly. Follow TSB Procedures: Follow the recommended procedures outlined in any relevant TSBs. Use a Wiring Diagram: Refer to a wiring diagram to properly test the continuity and voltage of the wiring and connectors. |
Detailed Explanations:
Faulty Steering Column Control Module (SCCM): The SCCM is an electronic module responsible for controlling various functions related to the steering column, such as turn signals, wipers, cruise control, and potentially even the power steering system. An internal failure within the SCCM can prevent it from communicating with other modules on the CAN bus, leading to the U0119 code. This failure could be due to component degradation, electrical shorts, or software corruption.
Wiring Issues: The wiring and connectors connecting the SCCM to the vehicle's CAN bus are crucial for transmitting data. Damage to these wires, such as cuts, abrasions, or corrosion, can disrupt the signal flow and trigger the U0119 code. Loose connectors can also interrupt the communication path. Thorough inspection and repair are necessary to resolve these issues.
CAN Bus Problems: The Controller Area Network (CAN) bus is the vehicle's central communication network, allowing various modules to exchange data. Problems within the CAN bus, such as shorts, opens, or high resistance, can disrupt communication between modules, including the SCCM. Diagnosing CAN bus issues often requires specialized tools and expertise.
Low Battery Voltage: Insufficient battery voltage can cause various electronic modules to malfunction or fail to communicate correctly. The SCCM requires a stable voltage supply to operate effectively. A weak or failing battery can lead to communication errors and trigger the U0119 code.
Faulty Module Programming: The SCCM's software controls its functions and communication protocols. If the software is corrupted or outdated, it can lead to communication errors. Reprogramming the SCCM with the correct software version can resolve these issues.
Faulty Gateway Module: The gateway module acts as a translator between different CAN bus systems within the vehicle. If the gateway module fails, it can prevent the SCCM from communicating with other modules on the CAN bus, resulting in the U0119 code.
Ignition Switch Problems: A faulty ignition switch may not properly activate the SCCM or the CAN bus, preventing the SCCM from establishing communication with the rest of the vehicle's electronic system. This can manifest as a U0119 code, along with other symptoms related to the ignition system.
Loss of Power Steering: One of the most noticeable symptoms of a U0119 code is the loss of power steering. The SCCM often plays a role in controlling or relaying information related to the power steering system. When communication is lost, the power steering may cease to function, making the vehicle harder to steer.
Malfunctioning Turn Signals: The SCCM typically controls the turn signal functionality. Loss of communication with the SCCM can disrupt the turn signal system, causing them to malfunction or stop working altogether. This poses a significant safety hazard.
Airbag Warning Light On: The airbag system relies on communication with various modules, including the SCCM. A U0119 code can trigger the airbag warning light if the SCCM is unable to communicate with the airbag control module. This indicates a potential issue with the airbag system that requires immediate attention.
Horn Malfunction: The horn is often controlled through the SCCM. A loss of communication can prevent the horn from functioning, which is crucial for safety in emergency situations.
Cruise Control Inoperable: The cruise control system relies on data from various modules, including the SCCM. If communication with the SCCM is lost, the cruise control system may become inoperable.
Vehicle May Not Start: In some cases, the loss of communication with the SCCM can prevent the vehicle from starting. This is because the SCCM may be required to transmit critical data for the engine control module (ECM) to authorize starting.
Warning Messages on Dashboard: A U0119 code can trigger various warning messages on the dashboard, such as "Steering Fault," "Airbag Malfunction," or "Service Power Steering." These messages indicate a problem with the affected systems and should be investigated promptly.
Erratic Wiper Operation: The windshield wipers are often controlled by the SCCM. Loss of communication can cause the wipers to operate erratically, such as running continuously or not working at all.
Scan for DTCs: Using an OBD-II scanner to retrieve all stored DTCs is the first step in diagnosing a U0119 code. This provides valuable information about the specific communication fault and any other related issues.
Inspect Wiring and Connectors: A visual inspection of the wiring and connectors related to the SCCM is crucial for identifying any damage, corrosion, or loose connections. This can often reveal the source of the communication problem.
Check Battery Voltage: Verifying the battery voltage is essential to rule out low voltage as a potential cause of the U0119 code. A low battery can cause various electronic modules to malfunction.
Test SCCM Power and Ground: Ensuring that the SCCM is receiving proper power and ground is crucial for its operation. Use a multimeter to test the power and ground circuits to the SCCM.
Perform CAN Bus Diagnostics: Using a CAN bus diagnostic tool to check for communication issues on the CAN bus is essential for identifying any problems within the network itself.
Check Ignition Switch Operation: Verifying that the ignition switch is functioning correctly is important, as a faulty ignition switch can prevent the SCCM from activating properly.
Review Technical Service Bulletins (TSBs): Checking for any TSBs related to the U0119 code for the specific vehicle make and model can provide valuable information about known issues and recommended repair procedures.
Use a Multimeter: Use a multimeter to test the continuity and voltage of the wiring and connectors. This ensures the wiring is intact and transmitting the correct signals.
Frequently Asked Questions:
Question: What does the U0119 code mean?
Answer: The U0119 code indicates a loss of communication with the Steering Column Control Module (SCCM). This means the vehicle's computer network is unable to communicate with the SCCM.
Question: What are the symptoms of a U0119 code?
Answer: Common symptoms include loss of power steering, malfunctioning turn signals, airbag warning light, horn malfunction, and the vehicle may not start.
Question: What causes a U0119 code?
Answer: Possible causes include a faulty SCCM, wiring issues, CAN bus problems, low battery voltage, or faulty module programming.
Question: Can I fix a U0119 code myself?
Answer: Diagnosing and repairing a U0119 code can be complex and often requires specialized tools and knowledge. While some basic checks can be done, professional diagnosis is recommended.
Question: How serious is a U0119 code?
Answer: A U0119 code can be serious as it can affect safety-critical systems like power steering and airbags. It's important to address the issue promptly.
Conclusion:
The U0119 diagnostic trouble code signals a critical communication breakdown within a vehicle's electronic system, specifically highlighting a loss of contact with the Steering Column Control Module (SCCM). Addressing this issue promptly is essential for ensuring the safe and reliable operation of the vehicle.