U023C code meaning
Lost Communication With Image Processing Module C
What U023C means
U023C covers image processing module C, which GM uses for the video processing module (VPM) of its surround vision system. Bulletin 21-NA-209 (2021 Cadillac Escalade and Escalade ESV with RPO UXP) describes a black radio screen showing a triangle and a struck-through camera, with U023C and B1A62 current in the VPM K157; VPM software is the cause, and the repair is pulling fuse F28 for a minute, then reprogramming the VPM. GM's 2025 OBD summary 25OBDG04B lets EOCM3 set U023C when the surround vision data or the auxiliary camera status messages are absent for more than 0.25 s; the EOCM then disables adaptive cruise, and as a Special Type C code it leaves the MIL off. U053D covers invalid data from C.
U023C at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyHard
- Typical labor0.3 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U023C
- Black display with crossed-out camera symbol
- Surround view cameras unavailable
- Adaptive cruise control disabled
Common causes of U023C
- Most likelyVideo processing module software (GM 21-NA-209)
- PossibleFuse or supply to the video processing module
- Less likelyCamera or bus wiring to the module damaged
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Image module cCAN bus
What each part of U023C 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 U023C 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 U023C
What does U023C mean?
U023C means "Lost Communication With Image Processing Module C". U023C covers image processing module C, which GM uses for the video processing module (VPM) of its surround vision system. It is a generic code, so it means the same on every make.
Is it safe to drive with U023C?
U023C does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U023C fail an emissions test?
U023C 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 U023C to fix?
Difficulty: hard. A typical repair takes 0.3 to 3 hours of work. This is a job for a workshop.
Will U023C clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.