U055C code meaning
Invalid Data Received From Special Purpose Vehicle Control Module C
What U055C means
With U055C a module rejects the content of messages sent by special purpose controller C, the third of four slots for conversion electronics. No maker publishes a code-specific description. Ford's body builder bulletin for the 2023 Super Duty points to a typical pitfall: the factory interface module, the infotainment unit and the body control module all need matching software before the upfitter tool can talk to them, and trucks built before a June 2023 cut-off require a reflash. Out-of-step software on either side therefore produces data the receiver cannot accept. Diagnosis starts with the conversion paperwork and software levels rather than with the vehicle's own modules. U025B covers total silence of controller C.
U055C at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U055C
- Functions controlled by the conversion do not respond as configured
- Code appears after a software update or conversion work
Common causes of U055C
- Most likelySoftware levels of conversion controller and vehicle modules out of step
- PossibleConversion equipment added or changed without updating controller C
- Less likelyDamaged bus wiring in the conversion harness
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Special purpose vehicle module c
What each part of U055C means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 5C | The exact fault in that area. |
What to do next
- Note U055C 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 U055C
What does U055C mean?
U055C means "Invalid Data Received From Special Purpose Vehicle Control Module C". With U055C a module rejects the content of messages sent by special purpose controller C, the third of four slots for conversion electronics. It is a generic code, so it means the same on every make.
Is it safe to drive with U055C?
U055C does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U055C fail an emissions test?
U055C 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 U055C to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will U055C clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.