U0235 code meaning
Lost Communication With Front Distance Range Sensor - Single Sensor or Center
What U0235 means
U0235 means the forward long range radar, the single or centre sensor that measures the gap to traffic ahead for adaptive cruise and collision warning, has gone quiet. GM's 2025 OBD summary 25OBDG04B lets the object calculation module EOCM3 set it when any of six radar data bursts is absent for more than 0.25 s at 9-16 V, skipped in transport mode, after resets and during bus-off; adaptive cruise is then disabled and the code is Special Type C, so no MIL. GM PI PIC6606 (Cadillac Optiq 2025) reports Collision Alert or Driver Assist unavailable with a current U0235 and prescribes a BCM update plus a new long range radar after checking the wiring. Ford's 2014 list carries it without MIL. U023D/U023E are the corner sensors.
U0235 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 U0235
- Adaptive cruise control unavailable
- Collision alert or driver assist unavailable message
Common causes of U0235
- Most likelyRadar connector or wiring at the front end damaged (often after a collision)
- PossibleWeak 12 V supply or BCM calibration (GM PIC6606)
- PossibleLong range radar module faulty
- Less likelyFault on the object or chassis bus shared with other modules
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Acc radarCAN bus wiring
What each part of U0235 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 35 | The exact fault in that area. |
What to do next
- Note U0235 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 U0235
What does U0235 mean?
U0235 means "Lost Communication With Front Distance Range Sensor - Single Sensor or Center". U0235 means the forward long range radar, the single or centre sensor that measures the gap to traffic ahead for adaptive cruise and collision warning, has gone quiet. It is a generic code, so it means the same on every make.
Is it safe to drive with U0235?
U0235 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0235 fail an emissions test?
U0235 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 U0235 to fix?
Difficulty: hard. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U0235 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.