U1087 – OBD-II DTC

OBD-II DTC U1087 – SCP (J1850) Invalid or Missing Data for Primary Id

DTC U1087 meaning

DTC U1087 refers to a diagnostic trouble code that indicates an issue with the communication between modules in a vehicle’s network. Specifically, it signifies that the primary identifier data is either invalid or missing. This code is associated with the SCP (Single Wire CAN) communication protocol, which is used in some vehicles to facilitate communication between various electronic control units (ECUs).

DTC U1087 symptoms

Common symptoms associated with DTC U1087 may include:

• Warning lights illuminated on the dashboard, such as the check engine light.
• Malfunctioning or inoperative features controlled by the affected module.
• Intermittent or complete loss of communication with certain vehicle systems.
• Erratic behavior of electronic components, such as power windows or door locks.

DTC U1087 causes

Several factors can lead to the occurrence of DTC U1087, including:

• Faulty wiring or connectors in the communication network.
• Defective electronic control unit (ECU) that is not sending or receiving data properly.
• Corrosion or damage to the connectors or terminals.
• Software issues or bugs within the vehicle’s control modules.
• Low battery voltage or poor electrical connections affecting module communication.

DTC U1087 seriousness

DTC U1087 can be considered a moderate to serious issue, depending on the symptoms and the affected systems. If left unaddressed, it may lead to:

• Increased risk of vehicle malfunction or failure of critical systems.
• Inability to perform certain functions, such as starting the vehicle or using safety features.
• Potential for further damage to the vehicle’s electronic systems.

How to diagnose DTC U1087

To diagnose DTC U1087, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the U1087 code.
2. Check for any additional trouble codes that may provide more context.
3. Inspect the wiring and connectors related to the affected modules for damage or corrosion.
4. Test the voltage and ground connections to ensure they are within specifications.
5. Perform a visual inspection of the affected ECU for signs of damage or failure.
6. Check for software updates or reprogramming needs for the control modules.

How to fix DTC U1087 step-by-step instructions

To fix DTC U1087, follow these step-by-step instructions:

1. Address any wiring or connector issues found during diagnosis, repairing or replacing as necessary.
2. If a faulty ECU is identified, replace it with a new or refurbished unit.
3. Ensure all connections are clean and secure, applying dielectric grease if needed to prevent corrosion.
4. Reprogram or update the software of the affected control modules if applicable.
5. Clear the DTC using an OBD-II scanner and perform a test drive to verify the issue is resolved.
6. Monitor the vehicle for any reoccurrence of the code or related symptoms.

How to erase DTC U1087

To erase DTC U1087, 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 trouble codes menu on the scanner and locate DTC U1087.
4. Select the option to clear or erase the codes.
5. Confirm the action and wait for the scanner to indicate that the codes have been cleared.
6. Disconnect the scanner and start the vehicle to ensure the code does not reappear.

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