U1204 – OBD-II DTC

OBD-II DTC U1204 – SCP (J1850) Invalid or Missing Data for Steering Column

DTC U1204 meaning

DTC U1204 refers to a diagnostic trouble code indicating “Invalid or Missing Data for Steering Column” in vehicles equipped with the On-Board Diagnostics II (OBD-II) system. This code is specific to the SCP (Serial Communication Protocol) using the J1850 communication standard. It suggests that the vehicle’s control modules are unable to receive valid data from the steering column module, which can affect various systems, including steering and safety features.

DTC U1204 symptoms

Common symptoms associated with DTC U1204 may include:

• Warning lights illuminated on the dashboard, such as the steering or ABS light.
• Loss of power steering assist.
• Erratic or unresponsive steering behavior.
• Difficulty in turning the steering wheel.
• Other related warning messages or codes present in the system.

DTC U1204 causes

Several factors can lead to the occurrence of DTC U1204, including:

• Faulty steering column module.
• Wiring issues, such as damaged or corroded connectors.
• Communication problems between the steering column module and other control modules.
• Software glitches or outdated firmware in the vehicle’s control modules.
• Electrical issues, such as short circuits or open circuits in the steering system.

DTC U1204 seriousness

The seriousness of DTC U1204 can vary based on the symptoms and the vehicle’s condition. It is generally considered a moderate to high priority issue because:

• It can affect the vehicle’s steering performance, leading to safety concerns.
• It may disable certain safety features, such as electronic stability control.
• Ignoring the code can lead to further damage to the steering system or related components.

How to diagnose DTC U1204

To diagnose DTC U1204, follow these steps:

1. Use an OBD-II scanner to confirm the presence of DTC U1204 and check for any additional codes.
2. Inspect the wiring and connectors related to the steering column module for damage or corrosion.
3. Test the steering column module for proper operation using a multimeter or diagnostic tool.
4. Check for communication issues between the steering column module and other control modules.
5. Review the vehicle’s service history for any previous repairs or software updates that may relate to the issue.

How to fix DTC U1204 step-by-step instructions

To fix DTC U1204, follow these step-by-step instructions:

1. Repair or replace any damaged wiring or connectors found during the diagnosis.
2. If the steering column module is faulty, replace it with a new or refurbished unit.
3. Reprogram or update the software of the steering column module if necessary.
4. Clear the DTC using an OBD-II scanner and perform a test drive to ensure the issue is resolved.
5. Monitor the vehicle for any reoccurrence of the code or related symptoms.

How to erase DTC U1204

To erase DTC U1204, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn the ignition key to the “On” position without starting the engine.
3. Access the “Erase Codes” or “Clear DTCs” function on the scanner.
4. Confirm the action to clear the trouble codes from the vehicle’s memory.
5. Disconnect the scanner and start the vehicle to check if the code reappears.

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