U0577 code meaning
Invalid Data Received From Lighting Driver Control Module D
What U0577 means
U0577 is the code for invalid messages from lighting driver control module D, the last of the four-letter block; U0276 is its lost-communication partner. LED matrix drivers can be chained: TI's TPS92662 addresses up to 31 devices over one multi-drop UART line, can use CAN transceivers for a sturdier physical layer, and also drives sequential turn signals and animated daytime lights. Lincoln documents four driver modules, A to D, for the headlamps of the 2025 Navigator without saying where each one sits. No manufacturer publishes U0577. Corrupt status from module D may disable dynamic functions it handles, while the lamp can keep burning in its default mode. No MIL.
U0577 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.3 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0577
- Sequential indicator or animated daytime light not working
- Lamp lit only in a basic setting
Common causes of U0577
- PossibleDriver module D software not at the level of the other lighting modules
- PossibleFault on the serial link between lighting controller and driver chips
- Less likelyLighting driver control module D internally faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Lighting driver module d
What each part of U0577 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 77 | The exact fault in that area. |
What to do next
- Note U0577 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U0577
What does U0577 mean?
U0577 means "Invalid Data Received From Lighting Driver Control Module D". U0577 is the code for invalid messages from lighting driver control module D, the last of the four-letter block; U0276 is its lost-communication partner. It is a generic code, so it means the same on every make.
Is it safe to drive with U0577?
U0577 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0577 fail an emissions test?
U0577 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U0577 to fix?
Difficulty: medium. A typical repair takes 0.3 to 3 hours of work. This is a job for a workshop.
Will U0577 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.