OBD-II DTC U1219 – SCP (J1850) Invalid or Missing Data for External Lamps
DTC U1219 meaning
DTC U1219 refers to a diagnostic trouble code that indicates an issue with the communication between the vehicle’s onboard diagnostic system and external lamps. Specifically, it signifies that there is invalid or missing data being transmitted over the SCP (Single Wire CAN) network, which is based on the J1850 protocol. This can affect the functionality of various external lighting systems, such as headlights, taillights, and turn signals.
DTC U1219 symptoms
Common symptoms associated with DTC U1219 may include:
- Malfunctioning external lamps (e.g., lights not turning on or off)
- Warning lights on the dashboard related to lighting systems
- Inconsistent operation of turn signals or brake lights
- Possible issues with other electronic systems that rely on lamp data
DTC U1219 causes
Several factors can lead to the occurrence of DTC U1219, including:
- Faulty wiring or connectors in the SCP network
- Defective external lamps or lamp control modules
- Corrupted data signals due to interference or short circuits
- Issues with the vehicle’s body control module (BCM) or other related control units
DTC U1219 seriousness
The seriousness of DTC U1219 can vary depending on the specific symptoms and the vehicle’s overall condition. While it may not pose an immediate safety risk, malfunctioning external lamps can lead to visibility issues, increasing the risk of accidents. Additionally, unresolved communication issues may affect other systems in the vehicle, making it important to address the code promptly.
How to diagnose DTC U1219
To diagnose DTC U1219, follow these steps:
- Use an OBD-II scanner to confirm the presence of the U1219 code.
- Inspect the vehicle’s wiring and connectors related to the SCP network for any visible damage or corrosion.
- Check the functionality of all external lamps to ensure they are operating correctly.
- Examine the body control module (BCM) for any faults or software issues.
- Perform a network test to check for communication errors between modules.
How to fix DTC U1219 step-by-step instructions
To fix DTC U1219, follow these step-by-step instructions:
- Clear the DTC using an OBD-II scanner.
- Inspect and repair any damaged wiring or connectors in the SCP network.
- Replace any faulty external lamps or lamp control modules.
- Reprogram or replace the body control module (BCM) if necessary.
- Reconnect all components and perform a system check to ensure proper communication.
- Test drive the vehicle to confirm that the DTC does not return.
How to erase DTC U1219
To erase DTC U1219, follow these steps:
- Connect an OBD-II scanner to the vehicle’s diagnostic port.
- Turn on the ignition without starting the engine.
- Navigate to the DTC menu on the scanner.
- Select the option to clear or erase trouble codes.
- Confirm the action and wait for the scanner to complete the process.
- Disconnect the scanner and perform a test drive to ensure the code does not reappear.
Recommended tools for OBD-II diagnostics
Explore our expert picks: The Best OBD2 Scanners for 2025
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.