Network, generic

U0505 Invalid Data Received From Door Control Module F

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

At Ford, F is the second of the electronic latch modules (DCMF). Its typical troubles are documented, though not with U0505 itself: 2020–2023 Aviators logged latch circuit codes in DCME–DCMH when low battery voltage met fault thresholds set too low (SSM 50556), and Mach-E cars raised false alarms through latch module software (SSM 51292). Both show that supply voltage and software are where such modules fail. U0505 is set when a listener receives DCMF's frames but discards them as implausible. GM's Saab 9-5 list maps the partner slot U0204 to the right rear door switch panel. Losing the frames completely gives U0204. Symptoms are door ajar warnings, an alarm going off or a door that will not open electrically.

Likely causes

Low 12 V battery voltage disturbing the latch module (Ford/Lincoln)
Outdated latch module software
Door control module F internally faulty

Symptoms

  • Door ajar or door fault warning
  • False alarm after locking

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–400
Time0.3–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

door control module f

Related codes

U0204U0504U0506

References: static.nhtsa.gov, static.nhtsa.gov, saabwisonline.com.