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DTC codes / U05xx · Network communication / U0575

U0575Invalid Data Received From Lighting Driver Control Module B

U0575 means the module that monitors the vehicle's lighting driver control module B has received data that it considers invalid, so it cannot trust the information coming from that lighting module. The computer has detected a communication or data integrity fault, not necessarily a failed lighting component itself.

SystemNetwork
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyProfessional
AreaNetwork communication

Symptoms you may notice

  • The check engine light or a lighting system warning light is illuminated on the dashboard.
  • One or more exterior lights may fail to operate, flash incorrectly, or stay on constantly.
  • The turn signals may blink at the wrong speed or not work at all.
  • The headlights may not switch between high and low beam properly or may default to a failsafe mode.
  • Often no symptoms besides the warning light, especially if the lighting module continues to function intermittently.
  • Other unrelated electrical accessories may behave erratically if the lighting module shares a communication bus.

Common causes, most likely first

  1. A faulty lighting driver control module B, often due to internal electronic failure or water intrusion.
  2. Damaged or corroded wiring and connectors between the lighting module and the module that sets the code.
  3. A weak or failing battery or poor ground connection causing low voltage to the lighting module.
  4. A software or calibration issue in the lighting module requiring a reflash or update.
  5. A communication bus fault, such as a shorted or open data line, that corrupts messages from the lighting module.
  6. Aftermarket lighting accessories or improper wiring modifications interfering with the module's data signal.

How to diagnose and fix it

  1. Perform a full battery and charging system test to rule out low voltage as the root cause.
  2. Inspect all wiring and connectors at the lighting driver control module B for corrosion, chafing, or loose pins.
  3. Check for technical service bulletins or software updates for the lighting module and related control modules.
  4. Use a scan tool to read live data and verify whether the lighting module is communicating and reporting plausible values.
  5. Perform a voltage drop test on the power and ground circuits feeding the lighting module.
  6. If wiring and power are good, substitute a known-good lighting module or perform module reprogramming as directed by the manufacturer.
  7. Clear the code and road-test the vehicle to confirm the fault does not return.

What the lighting module code really means

  • U0575 is a communication code, so replacing a light bulb or a lighting assembly rarely fixes it; the fault lies in the data path or the module itself.
  • A weak battery or a failing alternator can cause this code because lighting modules are sensitive to voltage fluctuations, so always test the charging system first.
  • Aftermarket LED bulbs or HID kits can introduce electrical noise that corrupts data on the lighting bus, triggering U0575 even when the factory module is healthy.
  • The code may be stored intermittently and only appear during cold starts or wet weather, pointing to a connector or ground issue rather than a failed module.
  • Some vehicles require a relearn or calibration procedure after replacing the lighting module, and skipping it will cause the code to reset immediately.

Can I keep driving with U0575?

You can usually drive the vehicle with U0575 stored, but be aware that exterior lighting may malfunction, which is a safety risk at night or in bad weather. Avoid driving after dark until the lighting system is repaired, and do not ignore the warning if multiple lights are affected.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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