U0504 code meaning
Invalid Data Received From Door Control Module E
What U0504 means
U0504 is the one door code of this series with a public manufacturer case. Ford names the electronic door latch controllers DCME to DCMH, and its programming applications list DCME as door control module E. In 2024–2026 Lincoln Nautilus and 2025–2027 Aviator, latch software stored B1262:92 in several of these modules, and U0504 could appear in the gearshift module, which evidently uses door status. The cluster then warned of a door fault, of the transmission not being in Park or of hill start assist being unavailable; the fix was a software update of DCME–DCMH (SSM 54938, 54978, 55241). No check engine light is mentioned. In GM's Saab 9-5 list the lost-communication partner U0203 is the left rear door switch panel.
U0504 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.3 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0504
- Door fault warning in the cluster
- Transmission Not In Park or Hill Start Assist Not Available messages (Lincoln)
- Door latch or electronic door release erratic
Common causes of U0504
- Most likelyDoor latch module software (Lincoln Aviator/Nautilus, update DCME–DCMH)
- PossibleDoor control module E internally faulty
- Less likelyDamaged wiring between body and door
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Door control module e
What each part of U0504 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 04 | The exact fault in that area. |
What to do next
- Note U0504 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 U0504
What does U0504 mean?
U0504 means "Invalid Data Received From Door Control Module E". U0504 is the one door code of this series with a public manufacturer case. It is a generic code, so it means the same on every make.
Is it safe to drive with U0504?
U0504 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0504 fail an emissions test?
U0504 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 U0504 to fix?
Difficulty: medium. A typical repair takes 0.3 to 2 hours of work. This is a job for a workshop.
Will U0504 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.