U023C on Cadillac: How to Diagnose & Fix
Lost Communication With Image Processing Module "C"
1 Cadillac model · 1 documented issue
U023C on Cadillac by model: symptoms, diagnosis and fix
GM 21-NA-209 covers a bounded 2021 Escalade ESV condition with RPO UXP: a black radio screen showing a triangle and camera-slash symbol with current or recent U023C and B1A62-86. It does not establish general OLED hardware, flicker or infotainment-module failure.
Common Symptoms
- Black radio screen
- Triangle and camera-slash symbol on the display
How to Fix
Confirm the exact display pattern, RPO and DTCs. The GM procedure removes VPM fuse F28 for one minute, reinstalls it and has the dealer reprogram the K157 Video Processing Module. Do not replace the OLED display from this card.
Sources for this issue (1)
U023C code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does U023C mean on a Cadillac?
U023C stands for "Lost Communication With Image Processing Module "C"." A generic (SAE U0xxx block) network/communication code: the module reporting U023C has stopped receiving expected messages from Image Processing Module C (IPM-C/IPA-C), one of the camera/vision processing controllers used by driver-assistance features. The definition is standardized, though which physical camera module is designated "C" varies by vehicle. Camera-based features (lane keeping, forward collision warning, automatic emergency braking, surround/parking views) are typically disabled while it is active. It reports a loss of communication, not proof the camera itself has failed — other bus or battery/ignition codes should be diagnosed first, since diagnosing U023C ahead of them is a common misdiagnosis. On Cadillac it is documented across 1 model: Escalade ESV.
What are the most common causes of U023C?
The most common causes of U023C are: Blown fuse or loss of power/ground to the image processing module, Damaged, corroded, or loose connector at the camera/image processing module, Open, short, or high resistance in the CAN bus wiring to the module, Failed image processing module (internal fault), Missing programming/calibration after module replacement or a windshield/camera swap — a replacement module must be programmed and calibrated to the vehicle, Low system voltage or a weak battery causing modules to drop off the bus. The specific cause varies by vehicle.
How much does it cost to fix U023C on a Cadillac?
Repair costs vary widely with the root cause and Cadillac model; each issue on this page carries its own estimate where one is published.
Looking for U023C on a different make?
View U023C across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.