U043C code meaning
Invalid Data Received From Front Distance Range Sensor - Right
What U043C means
U043C is the right-hand counterpart: invalid frames from the right front distance sensor, a corner radar on cars that pair one long-range radar with two short-range units. Finding only U043C points at that sensor, its plug or its mounting area, for example after a light knock on the right bumper corner; U043B and U043C together suggest a shared supply, bus segment or a software issue in the receiver. There is no public manufacturer documentation of U043C and no known threshold. In GM's 2025 EOCM3 tables the right front short-range radar is checked only for message loss, under U023E: more than 0.2 s without frames ends adaptive cruise, special Type C. Functions relying on the right corner view are reduced, others may stay available. U023E is lost contact.
U043C at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.4 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U043C
- Assistance functions using the right front view switched off
- Sensor blocked or check sensor message
Common causes of U043C
- PossibleRight corner radar knocked out of alignment or damaged
- PossibleShared supply or bus segment fault when both corner codes appear
- Less likelyMoisture or corrosion in the right sensor connector
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Front distance sensor right
What each part of U043C means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 3C | The exact fault in that area. |
What to do next
- Note U043C 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 U043C
What does U043C mean?
U043C means "Invalid Data Received From Front Distance Range Sensor - Right". U043C is the right-hand counterpart: invalid frames from the right front distance sensor, a corner radar on cars that pair one long-range radar with two short-range units. It is a generic code, so it means the same on every make.
Is it safe to drive with U043C?
U043C does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U043C fail an emissions test?
U043C 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 U043C to fix?
Difficulty: workshop only. A typical repair takes 0.4 to 2.5 hours of work. This is a job for a workshop.
Will U043C clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.