U0445 code meaning
Invalid Data Received From Body Control Module D
What U0445 means
U0445 belongs to body control module D, a fourth controller for body functions that only vehicles with heavily distributed body electronics need. A receiver sets it when D's frames arrive but their content fails range, counter or checksum tests; complete silence from D is U0144. No manufacturer documents U0445 publicly, and no maker states what D controls. That several body units can coexist in one vehicle is shown by Ford, whose 2023 F-150 trailer module monitors both the main BCM and module C (TSB 24-2116). Because the role of a D unit differs by design, the symptom depends on what it handles, from one inoperative light or lock to warnings in the cluster. Diagnosis starts with the freeze frame in the reporting module and the supply and bus wiring of module D.
U0445 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.3 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0445
- A body function handled by module D works erratically or not at all
- Warning messages in the instrument cluster
Common causes of U0445
- PossibleSoftware of module D or of the receiver not matching after an update
- PossibleDamaged bus wiring or corroded connector on the branch to module D
- Less likelyInternal fault or poor supply at body control module D
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Body control module dCAN bus wiring
What each part of U0445 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 45 | The exact fault in that area. |
What to do next
- Note U0445 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 U0445
What does U0445 mean?
U0445 means "Invalid Data Received From Body Control Module D". U0445 belongs to body control module D, a fourth controller for body functions that only vehicles with heavily distributed body electronics need. It is a generic code, so it means the same on every make.
Is it safe to drive with U0445?
U0445 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0445 fail an emissions test?
U0445 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 U0445 to fix?
Difficulty: workshop only. A typical repair takes 0.3 to 2 hours of work. This is a job for a workshop.
Will U0445 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.