U1104 – OBD-II DTC

OBD-II DTC U1104 – SCP (J1850) Invalid or Missing Data for Chassis Status Request

DTC U1104 meaning

DTC U1104 refers to a communication issue within the vehicle’s onboard diagnostic system. Specifically, it indicates that the data for the chassis status request is either invalid or missing. This code is associated with the SCP (Standard Corporate Protocol) communication network, which is used in some vehicles to facilitate communication between various modules and components.

DTC U1104 symptoms

Common symptoms associated with DTC U1104 may include:

• Illumination of the check engine light
• Loss of communication with certain vehicle modules
• Erratic behavior of vehicle systems, such as ABS or traction control
• Inconsistent readings from the dashboard gauges

DTC U1104 causes

Several factors can lead to the triggering of DTC U1104, including:

• Faulty wiring or connectors in the SCP network
• Defective or malfunctioning control modules
• Corrosion or damage to the connectors
• Software issues within the vehicle’s control modules
• Interference from aftermarket devices or modifications

DTC U1104 seriousness

The seriousness of DTC U1104 can vary depending on the specific symptoms and the vehicle’s overall condition. While it may not immediately affect drivability, it can lead to:

• Increased risk of system failures
• Inability to perform certain functions, such as ABS or stability control
• Potential safety concerns if critical systems are compromised

How to diagnose DTC U1104

To diagnose DTC U1104, follow these steps:

1. Use an OBD-II scanner to confirm the presence of DTC U1104.
2. Check for any additional DTCs that may provide more context.
3. Inspect the wiring and connectors related to the SCP network for damage or corrosion.
4. Test the affected control modules for proper operation.
5. Verify the integrity of the vehicle’s ground connections.
6. Check for software updates or reprogramming needs for the control modules.

How to fix DTC U1104 step-by-step instructions

To fix DTC U1104, follow these step-by-step instructions:

1. Inspect and repair any damaged wiring or connectors in the SCP network.
2. Replace any faulty control modules identified during diagnosis.
3. Clean any corroded connectors and ensure a secure connection.
4. Update or reprogram control modules if necessary.
5. Clear the DTC using an OBD-II scanner and test drive the vehicle.
6. Monitor for the reoccurrence of the DTC or related symptoms.

How to erase DTC U1104

To erase DTC U1104, 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 clearing function on the scanner.
4. Select the option to erase or clear the DTCs.
5. Confirm the action and wait for the scanner to complete the process.
6. Disconnect the scanner and start the vehicle to ensure the DTC does not return.

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