U1197 – OBD-II DTC

OBD-II DTC U1197 – SCP (J1850) Invalid or Missing Data for Door Locks

DTC U1197 meaning

DTC U1197 refers to a diagnostic trouble code that indicates an issue with the communication between the vehicle’s modules, specifically related to the door locks. The code signifies that there is invalid or missing data being transmitted over the SCP (Single Wire Communication Protocol) using the J1850 standard. This can affect the functionality of the door locks and other related systems.

DTC U1197 symptoms

Common symptoms associated with DTC U1197 may include:

• Inoperative door locks
• Door lock switches not responding
• Malfunctioning remote keyless entry system
• Warning lights on the dashboard related to door locks
• Other communication-related issues within the vehicle

DTC U1197 causes

Several factors can lead to the triggering of DTC U1197, including:

• Faulty door lock actuator
• Damaged wiring or connectors in the door lock circuit
• Malfunctioning body control module (BCM)
• Issues with the SCP communication network
• Corrosion or poor connections in the electrical system

DTC U1197 seriousness

The seriousness of DTC U1197 can vary. While it may not pose an immediate safety risk, it can lead to inconvenience due to non-functional door locks. Additionally, if left unaddressed, it may indicate underlying issues with the vehicle’s electrical system that could affect other components.

How to diagnose DTC U1197

To diagnose DTC U1197, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the U1197 code.
2. Check for any additional trouble codes that may provide more context.
3. Inspect the wiring and connectors related to the door lock system for damage or corrosion.
4. Test the door lock actuator for proper operation.
5. Examine the body control module for faults or software issues.
6. Verify the integrity of the SCP communication network.

How to fix DTC U1197 step-by-step instructions

To fix DTC U1197, follow these step-by-step instructions:

1. Clear the DTC using an OBD-II scanner.
2. Inspect and repair any damaged wiring or connectors in the door lock circuit.
3. Replace the door lock actuator if it is found to be faulty.
4. Check and, if necessary, reprogram or replace the body control module.
5. Ensure that the SCP communication network is functioning correctly.
6. Re-scan the vehicle to confirm that the DTC has not returned.

How to erase DTC U1197

To erase DTC U1197, 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. Navigate to the “Erase Codes” or “Clear DTCs” option on the scanner.
4. Confirm the action to clear the trouble codes.
5. Disconnect the scanner and start the vehicle to check if the code returns.

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