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DTC codes / U05xx · Network communication / U0577

U0577Invalid Data Received From Lighting Driver Control Module D

U0577 is a communication fault where the lighting driver control module D reports data that the main body computer judges invalid or out of range. The computer has received a message from that module but the message content fails its internal plausibility or checksum checks, so it flags the data as untrustworthy rather than treating it as a total loss of communication.

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

Symptoms you may notice

  • The warning light (check engine or service vehicle soon) illuminates with no other obvious change in vehicle behavior.
  • One or more exterior lighting functions may behave erratically, such as a lamp staying on, flickering, or not responding to the switch.
  • The lighting driver control module may default to a fail-safe mode, disabling certain lighting features or dimming outputs.
  • A message such as 'lighting system fault' or 'service lighting system' may appear on the driver information center.
  • In some vehicles, unrelated body functions that share the same communication bus may show intermittent glitches.
  • Often no symptoms besides the warning light, especially if the invalid data is intermittent and the module recovers quickly.

Common causes, most likely first

  1. Corroded, loose, or damaged wiring and connectors at the lighting driver control module D or its bus splice points.
  2. A failing lighting driver control module D internal circuit that corrupts its own outgoing data.
  3. Low or unstable battery voltage causing the module to send out-of-range data during cranking or heavy electrical loads.
  4. A faulty ground connection shared by the lighting module and other body electronics, leading to reference voltage shifts.
  5. Electromagnetic interference from aftermarket lighting, HID ballasts, or poorly routed accessory wiring near the module harness.
  6. A software or calibration issue in the lighting driver control module D that requires a reflash or update.
  7. A malfunctioning body control module (BCM) or gateway that misinterprets valid data from the lighting module as invalid.

How to diagnose and fix it

  1. Verify battery state of charge and perform a voltage drop test on the battery and charging system, as low voltage is a common trigger for invalid data faults.
  2. Inspect and clean the connectors and terminals at lighting driver control module D, looking for corrosion, pushed pins, or water intrusion.
  3. Check the module's ground circuit with a multimeter under load to confirm resistance is within specification.
  4. Use a scan tool to read live data and freeze-frame information from the lighting driver control module D, comparing commanded versus actual lighting states.
  5. Perform a wiggle test on the harness while watching live data to expose intermittent wiring faults that set the code only under vibration.
  6. If wiring and power are confirmed good, follow the manufacturer's diagnostic flow for module communication and consider reflashing or replacing the lighting driver control module D.
  7. After any repair, clear the code and complete a drive cycle that exercises all lighting functions to confirm the fault does not return.

What invalid data really means here

  • U0577 is not a no-communication code; the module is talking, but the body computer rejects the content, so replacing the module outright often misses a wiring or voltage problem.
  • A weak battery or failing alternator can set this code intermittently because the lighting module sends corrupted data when supply voltage dips during engine cranking.
  • Aftermarket LED or HID lighting conversions frequently introduce electrical noise that the lighting driver control module D reports as invalid data, even though the lamps appear to work.
  • The code can be stored alongside unrelated body codes if a shared ground or bus splice is corroded, so always check for multiple codes before condemning the lighting module.
  • Some vehicles require a module reflash or configuration reset after battery replacement, and skipping that step can leave U0577 stored even though no hardware is faulty.

Can I keep driving with U0577?

The vehicle is generally safe to drive because the fault affects lighting data rather than engine or brake control, but you should avoid driving at night or in low-visibility conditions until the lighting operation is confirmed normal. If exterior lights fail or behave unpredictably, stop driving and have the circuit inspected promptly.

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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