What it means
A receiving control module has detected invalid data from Lighting Driver Control Module C. The code does not specify which data is invalid or why.
How it works
Lighting Driver Control Module C manages or reports lighting functions to other vehicle modules over the network. U0576 is set when a receiving module considers data attributed to Module C invalid; it does not specify which lighting information failed validation or prove the module is defective.
Common causes
Most likely first.
- Module internal fault or sensor input drift
- Software version mismatch after replacement
- Gateway module routing CAN messages incorrectly
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
How to diagnose it
- Scan all modules and record freeze-frame details, because lighting, body, and network codes may identify which function or communication path is affected.
- Check the vehicle's exterior and interior lights for faults that may correspond to Module C, including intermittent operation.
- Inspect Module C's connectors and harness for looseness, corrosion, moisture, or damage, and check its power and ground connections.
- Use a capable scan tool to review available Module C data and compare reported lighting states with the actual lamps and switch commands.
- Check for correct module software and configuration, especially if lighting components or modules were recently replaced.
- If wiring and configuration are sound, test network messages and gateway routing according to the manufacturer's procedure.
Common fixes
- Secure or clean a loose or corroded Module C connector.
- Repair damaged wiring or power and ground connections to Module C.
- Correct software or configuration following a lighting-module replacement.
- Repair a lighting component or input only when testing links it to invalid Module C data.
- Replace Module C or repair the gateway only when diagnostics confirm the fault.
Can I keep driving?
Check that required lights work before driving, and avoid driving at night or in poor visibility if exterior lighting is unreliable. A lighting fault can reduce your visibility or make the vehicle harder for others to see.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.