U0143 code meaning
Lost Communication With Body Control Module C
What U0143 means
With U0143 a listener reports that body controller C has gone quiet. The letter only means a third body unit; its role is set by the maker. Ford is the one maker found using the code publicly: on the 2021 F-150 the trailer module stores U0143:87, the suffix marking a missing message, because of software parameters in that module. Ford's SSM 50217 calls it harmless, with no warning or drivability effect, and announced an over-the-air update of the trailer module from March 2022. So on these trucks a lone U0143 in the trailer module is no reason to replace anything. Elsewhere the usual network rule applies: a supervised periodic message from module C is missing while supply voltage is valid. U0140 to U0142 cover the other body modules, U0444 invalid data from C.
U0143 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.2 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0143
- Often none; code found only during a scan
- Functions of module C (for example trailer-related outputs) unavailable
- Scan tool cannot reach module C
Common causes of U0143
- Most likelySoftware parameters in the listening module (Ford F-150 trailer module)
- PossiblePower, fuse or ground of module C missing
- PossibleBus line or connector to module C damaged
- Less likelyBody module C internally faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Body control moduleCAN bus wiring
What each part of U0143 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 43 | The exact fault in that area. |
What to do next
- Note U0143 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 U0143
What does U0143 mean?
U0143 means "Lost Communication With Body Control Module C". With U0143 a listener reports that body controller C has gone quiet. It is a generic code, so it means the same on every make.
Is it safe to drive with U0143?
U0143 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0143 fail an emissions test?
U0143 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 U0143 to fix?
Difficulty: medium. A typical repair takes 0.2 to 3 hours of work. This is a job for a workshop.
Will U0143 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.