U1249 – OBD-II DTC

OBD-II DTC U1249 – SCP (J1850) Invalid or Missing Data for Time / Date

DTC U1249 meaning

DTC U1249 refers to a diagnostic trouble code indicating an issue with the Serial Communication Protocol (SCP) in vehicles that utilize the J1850 communication standard. Specifically, it signifies that there is invalid or missing data related to the time and date information transmitted between modules in the vehicle’s network. This can affect various systems that rely on accurate time and date data for proper operation.

DTC U1249 symptoms

Common symptoms associated with DTC U1249 may include:

• Malfunctioning of certain electronic modules
• Inaccurate time and date displayed on the dashboard
• Communication issues between modules
• Warning lights illuminated on the dashboard
• Possible loss of functionality in features that depend on time/date data

DTC U1249 causes

Several factors can lead to the occurrence of DTC U1249, including:

• Faulty or damaged wiring in the communication network
• Defective electronic control modules (ECMs)
• Corrupted software or firmware in the modules
• Issues with the vehicle’s battery or power supply
• Interference from aftermarket devices or modifications

DTC U1249 seriousness

The seriousness of DTC U1249 can vary depending on the vehicle’s reliance on the affected systems. While it may not pose an immediate safety risk, it can lead to:

• Inconvenience due to malfunctioning features
• Potential for further communication issues if not addressed
• Increased difficulty in diagnosing other related DTCs

How to diagnose DTC U1249

To diagnose DTC U1249, follow these steps:

1. Use an OBD-II scanner to confirm the presence of DTC U1249.
2. Check for any additional DTCs that may provide more context.
3. Inspect the vehicle’s wiring and connectors related to the SCP network for damage or corrosion.
4. Test the voltage and ground connections to the affected modules.
5. Verify the functionality of the modules involved in the communication.
6. Check for software updates or reprogramming needs for the modules.

How to fix DTC U1249 step-by-step instructions

To fix DTC U1249, follow these steps:

1. Repair or replace any damaged wiring or connectors found during diagnosis.
2. Replace any faulty electronic control modules as needed.
3. Update or reprogram the software in the affected modules if necessary.
4. Ensure the vehicle’s battery and power supply are functioning correctly.
5. Clear any aftermarket devices that may interfere with the SCP network.
6. Re-scan the vehicle to confirm that DTC U1249 has been resolved.

How to erase DTC U1249

To erase DTC U1249, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Access the trouble codes menu on the scanner.
3. Select the option to clear or erase DTCs.
4. Confirm the action and wait for the scanner to complete the process.
5. Disconnect the scanner and start the vehicle to check if the code reappears.

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