U023E code meaning
Lost Communication With Front Distance Range Sensor - Right
What U023E means
U023E is the mirror image for the right front corner: the short range radar on the passenger side of the front bumper no longer delivers its object data. Together with the left unit (U023D) and the centre long range radar (U0235) it gives adaptive cruise and collision assistance a wider view of vehicles merging into the lane. Publicly only GM documents the code, in its 2025 OBD summary 25OBDG04B, where EOCM3 flags U023E after a gap of more than 0.20 s in any of the six right front radar bursts, with the usual exclusions for transport mode, resets and bus-off; adaptive cruise is then switched off and the code is classed Special Type C, so the MIL stays off. If U023D and U023E set together, look at a shared supply or bus. U043C covers invalid data.
U023E at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyHard
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U023E
- Adaptive cruise control switched off
- Driver assistance warning on the cluster
Common causes of U023E
- Most likelyRight front corner radar wiring damaged after collision or bumper removal
- PossibleSupply or bus fault shared with the left corner radar
- Less likelyRight front corner radar faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Front distance sensor rCAN bus
What each part of U023E means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 3E | The exact fault in that area. |
What to do next
- Note U023E 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 U023E
What does U023E mean?
U023E means "Lost Communication With Front Distance Range Sensor - Right". U023E is the mirror image for the right front corner: the short range radar on the passenger side of the front bumper no longer delivers its object data. It is a generic code, so it means the same on every make.
Is it safe to drive with U023E?
U023E does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U023E fail an emissions test?
U023E 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 U023E to fix?
Difficulty: hard. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U023E clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.