U1090 – OBD-II DTC

OBD-II DTC U1090 – SCP (J1850) Invalid or Missing Data for Non-Legislated Diagnostics

DTC U1090 meaning

DTC U1090 refers to a communication issue within the vehicle’s network, specifically indicating “Invalid or Missing Data for Non-Legislated Diagnostics.” This code is part of the On-Board Diagnostics II (OBD-II) system and is associated with the SCP (Serial Communication Protocol) using the J1850 standard. It typically signifies that a module in the vehicle is not receiving or sending data correctly, which can affect various systems and functions.

DTC U1090 symptoms

Common symptoms associated with DTC U1090 may include:

• Warning lights illuminated on the dashboard, such as the check engine light.
• Malfunctioning or inoperative vehicle systems, such as the ABS or traction control.
• Erratic behavior of electronic components, including power windows or door locks.
• Difficulty in starting the vehicle or intermittent stalling.

DTC U1090 causes

Several factors can lead to the occurrence of DTC U1090, including:

• Faulty or damaged wiring and connectors in the communication network.
• Defective control modules that are unable to communicate properly.
• Corrosion or poor connections at the module or connector points.
• Software issues or bugs within the vehicle’s control modules.

DTC U1090 seriousness

DTC U1090 can be considered serious as it indicates a failure in communication between vehicle modules. This can lead to:

• Loss of functionality in critical systems, potentially affecting vehicle safety.
• Increased risk of further damage to electronic components if not addressed.
• Difficulty in diagnosing other related issues due to communication failures.

How to diagnose DTC U1090

To diagnose DTC U1090, follow these steps:

1. Use an OBD-II scanner to confirm the presence of DTC U1090.
2. Check for any additional DTCs that may provide more context.
3. Inspect the wiring and connectors related to the affected modules for damage or corrosion.
4. Test the affected control modules for proper operation and communication.
5. Review the vehicle’s service history for any recent repairs that may have affected the communication network.

How to fix DTC U1090 step-by-step instructions

To fix DTC U1090, follow these step-by-step instructions:

1. Inspect and repair any damaged wiring or connectors in the communication network.
2. Clean any corroded connections to ensure proper electrical contact.
3. Replace any faulty control modules that are not communicating correctly.
4. Update the software in the control modules if applicable.
5. Clear the DTC using an OBD-II scanner and test drive the vehicle to see if the code returns.

How to erase DTC U1090

To erase DTC U1090, 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 DTC menu on the scanner and select the option to clear or erase codes.
4. Confirm the action and wait for the scanner to complete the process.
5. Disconnect the scanner and start the vehicle to ensure the code does not reappear.

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